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A more complete list can be found [[FanWorks/Crossovers here]].
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* ''Fanfic/BreakingTheCode'' is this between ''Series/Numb3rs'' and ''Series/FoylesWar''.
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* ''Fanfic/TheDragonThatWillPierceTheHeavens'' is a ''Manga/OnePiece'' and ''Manga/FairyTail'' crossover, primarily set in the former universe with growing elements from the latter. This is shown as early as the first chapter, where OriginalCharacter Hikari helps Luffy out with the help of her [[''Manga/FairyTail Celestial Spirits]], eventually revealing herself as a [[''Manga/FairyTail Celestial Dragon]] and a Dragneel.
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* ''Fanfic/TheDragonThatWillPierceTheHeavens'' is a ''Manga/OnePiece'' and ''Manga/FairyTail'' crossover, primarily set in the former universe with growing elements from the latter. This is shown as early as the first chapter, where OriginalCharacter Hikari helps Luffy out with the help of her [[''Manga/FairyTail [[Manga/FairyTail Celestial Spirits]], eventually revealing herself as a [[''Manga/FairyTail [[Manga/FairyTail Celestial Dragon]] and a Dragneel.
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*''Fanfic/TheDragonThatWillPierceTheHeavens'' is a ''Manga/OnePiece'' and ''Manga/FairyTail'' crossover, primarily set in the former universe with growing elements from the latter. This is shown as early as the first chapter, where OriginalCharacter Hikari helps Luffy out with the help of her [[''Manga/FairyTail Celestial Spirits]], eventually revealing herself as a [[''Manga/FairyTail Celestial Dragon]] and a Dragneel.
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* The story ''Fanfic/TheLeapForward'', a crossover between ''Series/Numb3rs'' and ''Series/QuantumLeap'', which has Sam leap into Charlie's body to [[spoiler:clear an innocent man's name]].
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* {{Fanfic/Curse of the Dualshock}} is a crossover with [[WesternAnimation/PawPatrol PAW Patrol]] and {{VideoGame/Minecraft}}. The pups get trapped in the popular video game Minecraft.
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* {{Fanfic/Curse of the Dualshock}} is a crossover with [[WesternAnimation/PawPatrol PAW Patrol]] and {{VideoGame/Minecraft}}. The {{VideoGame/Minecraft}} in which the pups get trapped in the popular video game Minecraft.Minecraft and must beat the game to escape.
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* {{Fanfic/Curse of the Dualshock}} is a crossover with [[WesternAnimation/PawPatrol PAW Patrol]] and {{VideoGame/Minecraft}}. [[spoilers: The pups get trapped in the popular video game Minecraft.]]
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* {{Fanfic/Curse of the Dualshock}} is a crossover with [[WesternAnimation/PawPatrol PAW Patrol]] and {{VideoGame/Minecraft}}. [[spoilers: The pups get trapped in the popular video game Minecraft.]]
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* {{Fanfic/Curse_of_theDualshock}} is a crossover with [[WesternAnimation/PawPatrol PAW Patrol]] and {{VideoGame/Minecraft}}. [[spoilers: The pups get trapped in the popular video game Minecraft.]]
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* {{Fanfic/Curse_of_theDualshock}} {{Fanfic/Curse of the Dualshock}} is a crossover with [[WesternAnimation/PawPatrol PAW Patrol]] and {{VideoGame/Minecraft}}. [[spoilers: The pups get trapped in the popular video game Minecraft.]]
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* [[Fanfic/Curse_of_theDualshock Curse of the Dualshock]] is a crossover with [[WesternAnimation/PawPatrol PAW Patrol]] and [[VideoGame/Minecraft]]. [[spoilers: The pups get trapped in the popular video game Minecraft.]]
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* [[Fanfic/Curse_of_theDualshock Curse of the Dualshock]] {{Fanfic/Curse_of_theDualshock}} is a crossover with [[WesternAnimation/PawPatrol PAW Patrol]] and [[VideoGame/Minecraft]].{{VideoGame/Minecraft}}. [[spoilers: The pups get trapped in the popular video game Minecraft.]]
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* [[Fanfic/Curse_of_theDualshock Curse of the Dualshock]] is a crossover with [[WesternAnimation/PawPatrol PAW Patrol]] and "VideoGame/Minecraft". [[spoilers: The pups get trapped in the popular video game Minecraft.]]
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* [[Fanfic/Curse_of_theDualshock Curse of the Dualshock]] is a crossover with [[WesternAnimation/PawPatrol PAW Patrol]] and "VideoGame/Minecraft".[[VideoGame/Minecraft]]. [[spoilers: The pups get trapped in the popular video game Minecraft.]]
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* [[Fanfic/Curse_of_theDualshock Curse of the Dualshock]] is a crossover with [[WesternAnimation/PawPatrol PAW Patrol]] and "VideoGame/Minecraft". [[spoilers: The pups get trapped in the popular video game Minecraft.]]
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* ''FanFic/PointMeAtTheSkyrim'' is a crossover between {{Literature/Ward}} and {{VideoGame/The Elder Scrolls V}}, with the superheroine Antares replacing the {{Player Character}} Dragonborn, exploring the culture shock of Skyrim.
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* ''Fanfic/WeissReacts'' is primarily in the ''WebAnimation/RWBY'' universe, but shares a universe with ''Manga/{{Chobits}}'', ''[[Franchise/ShinMegamiTenseiPersona Persona]]'', the ''Franchise/{{Nasuverse}}'', ''Manga/FruitsBasket'', ''Manga/AiYoriAoshi'' and ''Anime/AKB0048'', with elements from ''Anime/CodeGeass'', ''Franchise/FireEmblem'', ''Anime/GuiltyCrown'' and ''VideoGame/LeagueOfLegends'', of all things.
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* ''Fanfic/WeissReacts'' is primarily in the ''WebAnimation/RWBY'' ''WebAnimation/{{RWBY}}'' universe, but shares a universe with ''Manga/{{Chobits}}'', ''[[Franchise/ShinMegamiTenseiPersona Persona]]'', the ''Franchise/{{Nasuverse}}'', ''Manga/FruitsBasket'', ''Manga/AiYoriAoshi'' and ''Anime/AKB0048'', with elements from ''Anime/CodeGeass'', ''Franchise/FireEmblem'', ''Anime/GuiltyCrown'' and ''VideoGame/LeagueOfLegends'', of all things.
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* Franchise/{{Highlander}}. You can dump Duncan or Connor or any of the other Immortals in almost any historical period; or assume, for a series set today that this or that character is Immortal; or for series set in the future, assume that someone from a 20th/21st C. series was a Highlander and hadn't lost his/her head before then. Of all the methods that ''Series/LawAndOrderUK'' fanfic writers used to revive the murdered DS Matt Devlin, revealing that he was an Immortal--as well as technically crossing over with ''another'' series by revealing that he was also Archie Kennedy--might have been the most creative.
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* Franchise/{{Highlander}}. You can dump Duncan or Connor or any of the other Immortals in almost any historical period; or assume, for a series set today that this or that character is Immortal; or for series set in the future, assume that someone from a 20th/21st C. series was a Highlander and hadn't lost his/her head before then. Of all the methods that ''Series/LawAndOrderUK'' fanfic writers used to revive the murdered DS Matt Devlin, revealing that he was an Immortal--as well as technically crossing over with ''another'' series [[Series/HoratioHornblower series]] in the story "[[Declassified https://m.fanfiction.net/s/7622098/1/Declassified]]" by revealing that he was also Archie Kennedy--might have been the most creative.
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* ''Fanfic/PointMeAtTheSkyrim'' is a crossover between ''{{Literature/Ward}}'' and ''VideoGame/TheElderScrollsVSkyrim'', with the super hero Antares (aka Victoria Dallon) awakening on the cart to Helgen with no memory of how she got there.
* ''Fanfic/AbyssalPlain'' is a crossover between ''{{Literature/Worm}}'', ''{{Literature/Ward}}'', and ''{{Literature/Pact}}'', with the Undersiders and Breakthrough finding themselves in the Abyss with their dead teammates.
* ''Fanfic/GospelOfTheLostGods'' is a crossover between ''{{Literature/Worm}}'' and ''Literature/ASongOfIceAndFire'' where the Chicago Wards end up Westeros and are forced to interact with the politics of the world.
* ''Fanfic/AbyssalPlain'' is a crossover between ''{{Literature/Worm}}'', ''{{Literature/Ward}}'', and ''{{Literature/Pact}}'', with the Undersiders and Breakthrough finding themselves in the Abyss with their dead teammates.
* ''Fanfic/GospelOfTheLostGods'' is a crossover between ''{{Literature/Worm}}'' and ''Literature/ASongOfIceAndFire'' where the Chicago Wards end up Westeros and are forced to interact with the politics of the world.
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* ''Fanfic/AnotherRainbowInAnotherSky'' is a crossover between ''WesternAnimation/MyLittlePonyAndFriends'' and [[spoiler:''WesternAnimation/TheCareBearsMovie'']]. [[spoiler:Megan's roommate Kim]] is [[spoiler:the same Kim]] from the film.
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* ''FanFic/BetweenMinds'' crosses {{Videogame/Portal}} and VideoGame/{{HalfLife}}.
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* ''FanFic/BetweenMinds'' ''Fanfic/BetweenMinds'' crosses {{Videogame/Portal}} and VideoGame/{{HalfLife}}.
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* ''Fanfic/LegacySekiroKimetsuNoYaiba'' has Sekiro living hundreds of years into the time of Demon Slayer, where demons now roam the land due to Kibitsuji Muzan. Taking in an orphaned boy named Kiyoshi, Wolf decides to help the boy channel his thirst for {{revenge}} into becoming a legendary demon slayer and his successor as the One-Eyed Fox.
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* ''Fanfic/AdviceAndTrust'' is primarily a ''Anime/NeonGenesisEvangelion'' fic, though it does feature Sayaka and Kyoko from ''Anime/PuellaMagiMadokaMagica'' as minor members of the supporting cast (WordOfGod specifies that they aren't {{Magical Girl}}s in this universe).
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* ''FanFic/BondBreaker'' has a SelfInsert of the author get pulled around the multiverse by a race of godlike beings wanting to find the answer to the "is there a God?" question. He gets to visit {{Manga/Naruto}}, [[Anime/NeonGenesisEvangelion NGE]], VideoGame/MassEffect, Literature/HarryPotter, VideoGame/TheLegendOfZelda, {{Disney/Frozen}}, Anime/SwordArtOnline, Franchise/StarWars, ''TabletopGame/{{Warhammer 40000}}'', VisualNovel/FateStayNight and [[VideoGame/TheLegendOfZeldaTheWindWaker Wind Waker]], to name a few.
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* ''FanFic/BondBreaker'' has a SelfInsert of the author get pulled around the multiverse by a race of godlike beings wanting to find the answer to the "is there a God?" question. He gets to visit {{Manga/Naruto}}, [[Anime/NeonGenesisEvangelion NGE]], VideoGame/MassEffect, Literature/HarryPotter, VideoGame/TheLegendOfZelda, {{Disney/Frozen}}, {{WesternAnimation/Frozen|2013}}, Anime/SwordArtOnline, Franchise/StarWars, ''TabletopGame/{{Warhammer 40000}}'', VisualNovel/FateStayNight and [[VideoGame/TheLegendOfZeldaTheWindWaker Wind Waker]], to name a few.
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* ''Fanfic/TangledAdventuresInArendelle'': Going on their honeymoon, the main cast of Disney/{{Tangled}} goes to visit [[Disney/{{Frozen}} Arendelle]] for a month..[[OhCrap just at Queen Elsa's coronation]].
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* ''Fanfic/TangledAdventuresInArendelle'': Going on their honeymoon, the main cast of Disney/{{Tangled}} WesternAnimation/{{Tangled}} goes to visit [[Disney/{{Frozen}} [[WesternAnimation/Frozen2013 Arendelle]] for a month..[[OhCrap just at Queen Elsa's coronation]].
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* There are a lot of fanarts involving [[Disney/TheJungleBook Kaa]] the Snake hypnotizing various victims. Google search "Kaa" and you'll see what the deal is.
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* There are a lot of fanarts involving [[Disney/TheJungleBook [[WesternAnimation/TheJungleBook1967 Kaa]] the Snake hypnotizing various victims. Google search "Kaa" and you'll see what the deal is.
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* This song combines ''Anime/{{Pokemon}}'' and ''Anime/{{Digimon}}'' to the tune of ''Disney/{{Mulan}}''.
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* This song combines ''Anime/{{Pokemon}}'' and ''Anime/{{Digimon}}'' to the tune of ''Disney/{{Mulan}}''.''WesternAnimation/{{Mulan}}''.
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* ''Fanfic/{{Ultrasonic}}'' is a crossover between ''WesternAnimation/MiraculousLadybug'' and ''Disney/{{Zootopia}}'', with Marinette being somehow transported to Zootopia with only Tikki for company, and her nemesis following her there a year later.
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* ''Fanfic/{{Ultrasonic}}'' is a crossover between ''WesternAnimation/MiraculousLadybug'' and ''Disney/{{Zootopia}}'', ''WesternAnimation/{{Zootopia}}'', with Marinette being somehow transported to Zootopia with only Tikki for company, and her nemesis following her there a year later.
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* ''FanFic/ThreeSpecialSteps'' is a crossover between ''WesternAnimation/Incredibles2'' and ''Disney/MeetTheRobinsons''.
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* ''FanFic/ThreeSpecialSteps'' is a crossover between ''WesternAnimation/Incredibles2'' and ''Disney/MeetTheRobinsons''.''WesternAnimation/MeetTheRobinsons''.
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* ''FanFic/DungeonKeeperAmi'' is an improbable mix of ''VideoGame/DungeonKeeper'' and ''Anime/SailorMoon''. And quite [[{{Understatement}} good.]]
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* ''FanFic/DungeonKeeperAmi'' ''Fanfic/DungeonKeeperAmi'' is an improbable mix of ''VideoGame/DungeonKeeper'' and ''Anime/SailorMoon''. And quite [[{{Understatement}} good.]]
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* ''FanFic/TheInfiniteLoops'' structure allows for almost any crossover and, in the background, is technically a MegaCrossover.
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* ''FanFic/TheInfiniteLoops'' ''Fanfic/TheInfiniteLoops'' structure allows for almost any crossover and, in the background, is technically a MegaCrossover.
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*The first season of ''Fanfic/TheJoysAndSorrowsOfYoungCharlesFinster'' is in fact a crossover between Nicktoon ''WesternAnimation/{{Rugrats}}'' and Disney cartoon ''WesternAnimation/{{Recess}}'', with Chas Finster from the former cartoon being the nephew to Miss Muriel P. Finster from the latter cartoon and all the Rugrats' parents attending Third Street Elementary School from kindergarten to sixth grade.
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* [[https://www.fanfiction.net/s/12381819/1/The-Connie-Ronnie-Switcheroo The Connie-Ronnie Switcheroo]] largely takes place in the ''WesternAnimation/TheLoudHouse'' universe, where two of the characters are observing an AlternateUniverse where one of those characters (Ronnie Anne Santiago) has swapped places with a character from ''WesternAnimation/StevenUniverse'' (Connie Maheswaran), resulting in the two characters befriending the opposite main characters (Lincoln Loud and Steven Universe) of those respective shows. This is achieved by using mutliversal transmitter goggles, which were apparently borrowed from [[WesternAnimation/RickAndMorty Rick Sanchez]] of all people.
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* [[https://www.fanfiction.net/s/12381819/1/The-Connie-Ronnie-Switcheroo The Connie-Ronnie Switcheroo]] largely takes place in the ''WesternAnimation/TheLoudHouse'' universe, where two of the characters are observing an AlternateUniverse where one of those characters (Ronnie Anne Santiago) has swapped places with a character from ''WesternAnimation/StevenUniverse'' (Connie Maheswaran), resulting in the two characters befriending the opposite main characters (Lincoln Loud and Steven Universe) of those respective shows. This is achieved by using mutliversal transmitter goggles, which were apparently borrowed from [[WesternAnimation/RickAndMorty [[Franchise/RickAndMorty Rick Sanchez]] of all people.
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* ''FanFic/PointMeAtTheSkyrim:'' is a crossover between {{Literature/Ward}} and {{VideoGame/The Elder Scrolls V}}, with the superheroine Antares replacing the {{Player Character}} Dragonborn, exploring the culture shock of Skyrim.
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*
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* ''FanFic/PointMeAtTheSkyrim:'' is a crossover between {{Literature/Ward}} and {{VideoGame/The Elder Scrolls V}}, with the superheroine Antares replacing the {{Player Character}} Dragonborn, exploring the culture shock of Skyrim.
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* ''Fanfic/InvaderFranny'' was an unfinished crossover between Nickelodeon cartoon ''WesternAnimation/InvaderZim'' and the children's book series ''Literature/FrannyKStein'' where Franny starts attendin the Skool, befriends Dib and ends up time-traveling to a BadFuture where she and Dib have to help Franny's future self take down an evil future version of Dib named Dark.
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* ''Fanfic/InvaderFranny'' was an unfinished crossover between Nickelodeon cartoon ''WesternAnimation/InvaderZim'' and the children's book series ''Literature/FrannyKStein'' where Franny starts attendin attending the Skool, befriends Dib and ends up time-traveling to a BadFuture where she and Dib have to help Franny's future self take down an evil future version of Dib named Dark.
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* ''Fanfic/InvaderFranny'' was an unfinished crossover between Nickelodeon cartoon ''WesternAnimation/InvaderZim'' and the children's book series ''Literature/FrannyKStein'' where Franny starts attendin the Skool, befriends Dib and ends up time-traveling to a BadFuture where she and Dib have to help Franny's future self take down an evil future version of Dib named Dark.
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%% This list of examples has been alphabetized. Please add your example in the proper place. Thanks!
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{{Crossover}}s are huge in all fanworks, and one biggest reasons to create them. Without pesky things like {{UsefulNotes/Copyright}}s or {{UsefulNotes/Trademark}}s, it's incredibly easy to combine any and all works together.
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* ''FanFic/ACertainMagicalFriendship'' crosses ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' with ''LightNovel/ACertainMagicalIndex'' using a magic portal that rebuilds characters as they move between the two settings. In Academy City, Twilight is a human cabal magician. In Ponyvile, Misaka is a pegasus who likes to keep lightning bolts in her fur. Which is fine, right up until villains start moving between the two worlds as well...
* ''[[Fanfic/AndersonQuestKillingVampiresAndWerewolvesAndLeprechuans Anderson Quest]]'' is a crossover between ''WebVideo/HellsingUltimateAbridged'' and ''{{VideoGame/Bloodborne}}'' where the infamous [[BadassPreacher Alexander]] [[BloodKnight Anderson]] is dropped into the Hunter's Dream.
* ''FanFic/ADarkKnightOverSinCity''. It's rather obvious what it is about, going by the [[ExactlyWhatItSaysOnTheTin title]].
* ''Fanfic/ATriangleInTheStars'' features ''WesternAnimation/StevenUniverse'' and ''WesternAnimation/GravityFalls'' in one combined world, with Steven Universe's world being the more primary one. Only Bill Cipher shows up there [[spoiler:at first]]...
* In the ''WesternAnimation/JackieChanAdventures'' and ''WesternAnimation/TeenTitans'' crossover fanfiction ''Fanfic/AShadowOfTheTitans'', Jade ends up in the Teen Titans universe.
* In ''Manga/YuGiOh'' fandom there's ''Blog/AskDarkHourBakura'' which is a CharacterBlog about a crossover between the characters of Duel Monsters and the world of ''VideoGame/{{Persona 3}}''.
* In ''Fanfic/HauntedMansionAndTheHatboxGhost'', following the "official" crossover with "The Nightmare before Christmas" that the "Haunted Mansion Holidays" event is, the characters from this movie are sometimes featured in the stories. ...Ah, and the Grinch from "How the Grinch stole Christmas" made a cameo ONCE in a single-panel comic, too.
* Even though the first story of ''Fanfic/AStickySituation'' remains solidly in the ''[[Anime/DigimonTamers Digimon]]'' season three universe, the second story tosses several of the characters into ''WesternAnimation/StarWarsTheCloneWars'' due to a dimension-traveling Digimon called Parallelmon (a {{Canon}} digimon, not an OriginalCharacter of the author). It is very well written and very entertaining.
* FanFic/{{Avalon}} is a bit of an odd example, being a cross between mainly ''Anime/NeonGenesisEvangelion'' and the ''Franchise/MarvelCinematicUniverse'' as the forefront, but with other Marvel properties also being mentioned as well as references to other fictional settings existing within the story. So far Manga/RosarioToVampire and the Franchise/{{Stargateverse}} have explicitly been mentioned as part of the shared universe.
* [[http://www.fanfiction.net/s/8985296/1/Avengers-The-Next-Generation This crossover]] between ''Film/{{The Avengers|2012}}'' and ''Film/PitchPerfect''. It features Beca as Tony and Pepper's daughter and the rest of the cast as various superheroes.
* ''Film/{{The Avengers|2012}}'' crossed with ''Literature/TheHungerGames'' has some surprisingly good crossovers, including the [[AnyoneCanDie heartbreaking]] ''[[http://archiveofourown.org/works/413095/chapters/685873 Embrace the Fire]]'' and the [[SparedByTheAdaptation less heartbreaking]] ''[[https://www.fanfiction.net/s/9775871/1/Something-to-Avenge Something To Avenge]]''.
* ''Fanfic/TheBankCalledYourRealityCheckBounced'' brings the Hosts from ''Anime/OuranHighSchoolHostClub'' into the post-Promised Day world of ''Manga/FullmetalAlchemist''. It goes about as well as you might expect, with Tamaki driving pretty much everybody up the wall.
* [[http://games.adultfanfiction.net/story.php?no=600086731 Bayonsiders]] has War from ''VideoGame/{{Darksiders}}'' and Bayonetta from ''VideoGame/{{Bayonetta}}'' meet up, have sex, beat up angels, beat up demons, and have sex while beating up angels and demons at the same time. All while trying to stay in continuity of both games.
* ''FanFic/BetweenMinds'' crosses {{Videogame/Portal}} and VideoGame/{{HalfLife}}.
* ''FanFic/BloodAndRevolution'' is a MassivelyMultiplayerCrossover that starts and remains primarily ''Manga/RurouniKenshin'' with a heavy dose of ''Manga/YuGiOh''.
* [[http://www.fanfiction.net/s/5493333/1/Brother_Bubbles Brother Bubbles]]. Space Marine Terminator finds himself in Rapture. Then meets a Little Sister.
* ''FanFic/BondBreaker'' has a SelfInsert of the author get pulled around the multiverse by a race of godlike beings wanting to find the answer to the "is there a God?" question. He gets to visit {{Manga/Naruto}}, [[Anime/NeonGenesisEvangelion NGE]], VideoGame/MassEffect, Literature/HarryPotter, VideoGame/TheLegendOfZelda, {{Disney/Frozen}}, Anime/SwordArtOnline, Franchise/StarWars, ''TabletopGame/{{Warhammer 40000}}'', VisualNovel/FateStayNight and [[VideoGame/TheLegendOfZeldaTheWindWaker Wind Waker]], to name a few.
* [[FanFic/BrutalSeries Brutal, Horrible, and What If]] is a series of crossovers between ''Manga/AxisPowersHetalia'' and the Hunger Games. Also AlternateUniverse.
* ''Series/BuffyTheVampireSlayer'' has a natural crossover point in the second season episode "Halloween", in which the main characters turn into their costumes for the night. The portal Buffy jumps through in the Fifth Season finale also provides a great opportunity for Buffy to visit some other show or story, as does the presence of [[RealityWarper Reality-Warping vengeance demons]].
** ''FanFic/OriginStory'' is a three way {{crossover}}: of ''Series/BuffyTheVampireSlayer'' and ''ComicBook/PowerGirl'', but set in the Franchise/MarvelUniverse. And it makes use of the "Halloween" episode for the justification of its crossover.
** ''FanFic/ASparkOfGenius'' is a three way {{Crossover}} between ''Series/BuffyTheVampireSlayer'', ''WesternAnimation/JusticeLeague'' and ''Webcomic/GirlGenius'' set in a DC universe that takes elements from both the cartoons and the comics. This story uses the "Halloween" episode for set up.
* ''[[http://z4.invisionfree.com/Refia/index.php?showtopic=1010 Callisto Meets The Powerpuff Girls]]'' sends one of the [[BigBad Big Bad]] villains of ''Series/XenaWarriorPrincess'' to Townsville, and naturally WesternAnimation/ThePowerpuffGirls are called in to save the day.
* ''Fanfic/CalvinAndHobbesTheSeries'' has a crossover ''episode'' - "Calvin's Franchise/{{Batman}} Adventure".
* ''Fanfic/ChildrenOfAnElderGod'': Between ''Anime/NeonGenesisEvangelion'' and the Franchise/CthulhuMythos. The Children fight [[EldritchAbomination the Great Old Ones and the Outer Gods]] in lieu of [[{{Robeast}} Angels]], and steal their powers upon slaying them.
* ''WesternAnimation/CatDog'' has even been crossed over with the {{anime}} ''[[Franchise/LoveLive Love Live! School Idol Project]]'' of all things on Website/DeviantArt. [[TalkingAnimal Dog]] and [[TheDitz Honoka Kousaka]] as friends, anyone?
* There are a few fics that cross over all the Creator/{{Nicktoons}}. One that does this along with extreme AU along with Alternate History (Vlad is now king of an FictionalCounterpart of America!) would be [[http://chesspiece.smackjeeves.com Chess Piece]] by NeoYi. It's filled with tons of continuity nods and has everything, from ''WesternAnimation/TheWildThornberrys'', ''WesternAnimation/InvaderZim'', and ''WesternAnimation/DoraTheExplorer'' to ''WesternAnimation/{{Doug}}'', ''WesternAnimation/AaahhRealMonsters'', ''WesternAnimation/CatDog'', and ''WesternAnimation/MyLifeAsATeenageRobot''. Seriously; it is also [[RuleOfCool awesome]].
* [[https://www.fanfiction.net/s/12381819/1/The-Connie-Ronnie-Switcheroo The Connie-Ronnie Switcheroo]] largely takes place in the ''WesternAnimation/TheLoudHouse'' universe, where two of the characters are observing an AlternateUniverse where one of those characters (Ronnie Anne Santiago) has swapped places with a character from ''WesternAnimation/StevenUniverse'' (Connie Maheswaran), resulting in the two characters befriending the opposite main characters (Lincoln Loud and Steven Universe) of those respective shows. This is achieved by using mutliversal transmitter goggles, which were apparently borrowed from [[WesternAnimation/RickAndMorty Rick Sanchez]] of all people.
* ''Fanfic/TheCriesOfHaruhiSuzumiya'' is a crossover between ''LightNovel/HaruhiSuzumiya'' and ''VisualNovel/HigurashiWhenTheyCry''.
* The game-idea series [[http://crossoverx.wikia.com/wiki/Crossover_X_Wiki Crossover X]] practically ''lives'' on this trope. It even uses the word "crossover" in its name.
* Fanfic/DantesNightAtFreddys is a crossover between ''VideoGame/DevilMayCry'' and ''VideoGame/FiveNightsAtFreddys'' in which the protagonist of the former delivers a CurbStompBattle to the villains of the latter.
* ''Fanfic/DeanThomasAndTheCurseOfJumanji'' is a crossover fic between ''Franchise/HarryPotter'' and ''Franchise/{{Jumanji}}''
* [[http://www.fanfiction.net/s/10020026/1/Delivered-From-Frollo Delivered From Frollo]] crosses ''The Hunchback of Notre Dame'' with ''Fantasia''.
* ''Fanfic/DemonOfJustice'' is older than Website/FanFictionDotNet and crosses Anime/MobileSuitGundamWing with [[Literature/TheWarGods Oath of Swords]], a high fantasy series.
* ''Fanfic/DieAbenteuerVonLucinaUndLink'' is a German fanfiction. It's a crossover between ''VideoGame/TheLegendOfZeldaSkywardSword'' and ''VideoGame/FireEmblemAwakening''
* [[http://www.fanfiction.net/s/5803383/1/Divine_Intervention Divine Intervention]] The [[Film/TheBoondockSaints MacManus brothers]] meet the [[Series/{{Supernatural}} Winchester brothers.]] And it is COOL.
* A favourite for many seems to be ''Series/DoctorWho'', due to the remarkable ease with which the Doctor can be inserted in any story just by having the TARDIS land there. One of the most famous, ''Fanfic/TheManWithNoName, is a ''Series/{{Firefly}}'' / ''Doctor Who'' crossover, which some say should be officially added to {{Canon}}.
** Yet it VERY strangely lists one of the unofficial rules of the internet dealing with crossovers (specifically, [[VideoGame/{{Touhou}} rule ⑨]]
** There's also ''Fanfic/AHero'', a crossover with ''Anime/PuellaMagiMadokaMagica'' which subverts most ''Series/DoctorWho'' crossover formulas by instead inserting [[ScaryDogmaticAliens Dalek]] [[MadScientist Sec]] to fix the mess.
** Another crossover that's become increasingly popular is Superwho, which combines ''Doctor Who'' with ''Series/{{Supernatural}}''.
*** Add one more show, ''Series/{{Sherlock}}'', to get Superwholock, which has become quite popular on Tumblr.
** All it took was one scene where a pony had a David Tennant-like hairstyle and an hourglass on his quarter. The result is that under crossovers at Website/FanFictionDotNet, ''Doctor Who'' is the most popular thing to cross into the world of ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', beating out Franchise/SonicTheHedgehog.
** ''Fanfic/ChildrenOfTime'' crosses Ten's era with Literature/SherlockHolmes '''and''' ''WesternAnimation/SherlockHolmesInTheTwentySecondCentury''. Holmes and Watson take Martha Jones' place in Season 3 as Companions, with just a handful of episodes staying close to the original. The Eleventh Doctor is planned to make an appearance eventually...
* ''Literature/TheDresdenFiles'' has a lot of crossovers, including a rare crossover with ''Series/{{Buffy|The Vampire Slayer}} that ''doesn't'' involve its "Halloween" episode. [[https://www.fanfiction.net/s/6600971/1/Higher-Stakes-A-Fanfiction-of-the-Dresden-Files Higher Stakes: A Fanfiction of the Dresden Files]] is complete. It contains spoilers for ''Changes'' and the ''[[ComicBook/BuffyTheVampireSlayer Buffy Season 8]]'' comics, replaces everything after ''Changes,'' and after the ''Buffy'' comics arc "Time of Your Life".
* ''FanFic/DungeonKeeperAmi'' is an improbable mix of ''VideoGame/DungeonKeeper'' and ''Anime/SailorMoon''. And quite [[{{Understatement}} good.]]
* ''FanFic/EventHorizonStormOfMagic'' started off as a crossover between Literature/ASongOfIceAndFire, Literature/TheLordOfTheRings, and TabletopGame/WarhammerFantasy by placing all three worlds on planets near to each other. Then the writer decided to add in a spacefaring MegaCorp from [[TwentyMinutesIntoTheFuture 22nd century Earth]] that's more or less an {{Expy}} of [[Franchise/{{Alien}} Weyland Yutani]].
* [[http://www.fanfiction.net/u/1263379/gabriel_blessing Gabriel Blessing]] is well known for his two ''VisualNovel/FateStayNight'' crossovers:
** ''Fanfic/TheHillOfSwords'', a ''LightNovel/TheFamiliarOfZero'' crossover wherein Louise summons Shirou as her familiar. This FanFic revived the whole concept of "Let's have Louise summon a different person than Saito !"
** ''Fanfic/InFlight'', a ''Manga/{{Sekirei}}'' crossover where Shirou discovers his NotQuiteDead mother, Takami Sahashi, and replaces Minato as the Ashikabi of the North.
* [[https://archiveofourown.org/works/14487714 Game of Mass Destruction]] crosses over multiple fandoms and has The Joker as president.
* The {{Series/Glee}} fanfic ''FanFic/HuntingTheUnicorn'' becomes a three-way crossover with {{Series/Firefly}} and ''Series/CriminalMinds''. [[spoiler: After Blaine and Kurt get rescued from Blaine's stalker,]] Blaine is taken to the Blue Sun hospital for his concussion, where Simon Tam treats him. He later calls the BAU when Blaine's distressed but incoherent rambling gives Simon the suspicion that [[spoiler: the stalker sexually assaulted Blaine.]]
* ''[[Fanfic/GodsAngelsAndKings Hail to the King]]'' is a crossover between {{Franchise/Godzilla}} and {{Anime/Neon Genesis Evangelion}}, using a amalgamated continuity for the former that also incorporates {{Series/Zone Fighter}}. The rewrite replaces Zone Fighter with Franchise/{{Ultraman}}
* Fanfic wise, it's almost impossible to find a fandom that ''doesn't'' have a crossover with ''Literature/HarryPotter. ''
** There are crossovers of ''WesternAnimation/TheLandBeforeTime'' with ''Franchise/StarWars'', ''[[Literature/InheritanceCycle Eragon]]'', ''VideoGame/MegaMan,'' and, in one case, ''VideoGame/{{Halo}}.'' [[http://www.fanfiction.net/s/3007925/1/Star_Wars_The_Land_Before_Time_A_Jedis_Destiny Amazingly, many find that the Star Wars/Land Before time crossover in question is actually good.]]
*** [[http://www.fanfiction.net/s/4307557/1/Harry_Potter_and_the_Land_Before_Time Found the cross between Harry Potter and The Land Before Time!]]
*** "Voldemort has found a way to go back [[ArtisticLicensePaleontology thousands of years]], to the time of the great dinosaurs"? That's not a promising opening line. There's even a [[http://www.fanfiction.net/s/5426174/1/ Land Before Time megacrossover series on FanFiction.net.]] Too bad [[SturgeonsLaw it's about the same as 90% of all fanfics.]]
** There is a really good one between ''Literature/HarryPotter'' and ''VideoGame/FinalFantasyVIII'' that starts when Harry, age 5, is magically transported to the world of [[VideoGame/FinalFantasyVIII FF8]] and once there he becomes a fine Gunblade fighter and is somehow able to use [[VideoGame/FinalFantasyVIII FF8]] magic and do everything one can in the game... without using Guardian Forces. He later has to go back to his own world, where an evil Dumbledore lays in waiting... See [[http://www.fanfiction.net/s/3471134/1/ here for the prequel+ Philosopher's Stone]] arc, [[http://www.fanfiction.net/s/3531911/1/ here for the Chamber of Secrets]] arc and [[http://www.fanfiction.net/s/3580477/1/ here for the Prisoner of Azkaban]] arc. It's a pity that the third arc is not finished...
** There's a small collection of ComicStrip/CalvinAndHobbes[=/=]Literature/HarryPotter crossovers, all involving Calvin being a wizard. Luckily this corner of fan fiction seems to be untouched by SturgeonsLaw, although that may be because they're so small in number. [[http://www.fanfiction.net/Harry_Potter_and_Calvin_Hobbes_Crossovers/224/266/ Give em a look.]] [[http://www.fanfiction.net/s/6548722/1/Calvin_and_Hobbes_in_the_Wizarding_World This one is particularly good so far.]]
** Harry Potter in ''Film/ThePrincessBride''. Hermione dreams the people she knows into the plot of the movie, with herself in the role of the Grandson being read the book by Dumbledore. [[http://www.fanfiction.net/s/135041/1/Harry_Potter_and_the_Florinese_Dream No, really!]]
** One involved the plot of ''Pretty Little Liars'' being re-imagined in the Potter universe. Unlike most other crossovers, the characters of both series don't actually meet. [[http://www.fanfiction.net/s/6701410/1/Pretty_Little_Witches Here it is]]
** Since both Harry and Edward Elric are looking for the PhilosophersStone at some point, there's a lot of crossover fanfiction with ''Manga/FullmetalAlchemist''.
** ''Snakeskins'' is, without a doubt, one of the best fanfics in the whole crossover with ''Webcomic/AxisPowersHetalia'' fandom, in which the two universes are blended amazingly and England and Italy are still their immortal Nation-tan selves while they're at Hogwarts. It... sounds kinda confusing, but it's a lot simpler in context.
** ''FanFic/HarryPotterBecomesACommunist'' does some crossovers with other ''Harry Potter'' fanfics. This consists of, to date, brief appearances by the Professor Quirrell from ''FanFic/HarryPotterAndTheMethodsOfRationality'', Ebony Dark'ness Dementia Raven Way from ''FanFic/MyImmortal'', and Rhysenn Malfoy from ''Fanfic/TheDracoTrilogy''.
* Franchise/{{Highlander}}. You can dump Duncan or Connor or any of the other Immortals in almost any historical period; or assume, for a series set today that this or that character is Immortal; or for series set in the future, assume that someone from a 20th/21st C. series was a Highlander and hadn't lost his/her head before then. Of all the methods that ''Series/LawAndOrderUK'' fanfic writers used to revive the murdered DS Matt Devlin, revealing that he was an Immortal--as well as technically crossing over with ''another'' series by revealing that he was also Archie Kennedy--might have been the most creative.
* In the ''Fanfic/SkyholdAcademyYearbook'' series, ''I Must Be Going'' manages to be both this trope ''and'' SelfInsertFic. It's a crossover from the reader's point of view, being a merging of ''VideoGame/DragonAgeInquisition'' and ''Film/ThePrincessBride''. However, it's a StoryWithinAStory, written and narrated by Varric Tethras; and to the people listening to him read it, it's a SelfInsertFic because ''they're'' the ones in it.
* ''FanFic/TheInfiniteLoops'' structure allows for almost any crossover and, in the background, is technically a MegaCrossover.
* ''Fanfic/TheInstituteSaga'' was initially a Franchise/{{Superman}}/WesternAnimation/XMenEvolution crossover... then it crossed over with series such like ''WesternAnimation/{{Gargoyles}}'' and even other fanfics like ''Fanfic/MakeAWish''.
* In ''[[http://www.fanfiction.net/s/8514012/2/Keena-the-Defendants-of-Constan-Magic-Academy Keena & the Defendants of Constan Magic Academy]]'', starting in chapter 8, the group go to an AlternateUniverse that features characters from the anime film Loups=Garous.
* ''Fanfic/KyonBigDamnHero'' manages to become a crossover between LightNovel/HaruhiSuzumiya and ''Wiki/TvTropes'', with ''VisualNovel/HigurashiWhenTheyCry'' and bits of [[spoiler:''VideoGame/HalfLife'']] added in as well.
* ''Fanfic/LastChildOfKrypton'': Between ''Anime/NeonGenesisEvangelion'' and Franchise/TheDCU (the rewrite focusing exclusively on the Franchise/{{Superman}} side of the universe). Shinji was genetically modified with Kryptonian DNA when he was still a fetus, and became Superman when he grew up.
* Two ''Series/LawAndOrderUK'' fanfics:
** One that crosses over with ''Series/{{Highlander}}'' and ''Series/HoratioHornblower'' has Matt Devlin recovering from the bullet wounds he sustained and explaining to a stunned Alesha and Ronnie that he's immortal and is really Archie Kennedy of the latter series (also probably lampshading [[Creator/JamieBamber Jamie Bamber's]] ChronicallyKilledActor status).
** Another sent Matt and Ronnie to Washington, DC to work with the ''Series/{{NCIS}}'' team. Rather [[HilariousInHindsight amusing]] considering that a) Creator/JamieBamber eventually began a recurring role on the show, and b) thehe team actually did work with UsefulNotes/BritishCoppers at one point.
* ''FanFic/LightAndDarkDEUXTheNewAdventuresOfDarkSoichiro'' is a FanSequel to ''FanFic/LightAndDarkTheAdventuresOfDarkYagami'', which crosses over with other [[TrollFic Troll Fics]], with the description advertising the presence of [[Fanfic/CodeGeassAwesomeOfTheRebellion Awesome de Britannia]], and [[Fanfic/MyImmortal Enoby]].
* ''Fanfic/TheLoneTraveler'': The eponymous Traveler, Harry Potter from a [[FanFic/HarryPotterAndTheNightmaresOfFuturesPast Nightmares of Futures Past]]-type universe, moves through the multiverse, ''Series/QuantumLeap'' style.
* 4 crossovers with ''WesternAnimation/LooneyTunes'' and ''WesternAnimation/WinxClub'' have been done by [[http://www.fanfiction.net/~looneywriter looneywriter]] and [[http://www.fanfiction.net/~kidswbyungsta kidswbyungsta]]. Sure enough, keeping in with the Looney Tunes style of humor, as well as adding characters from ''WesternAnimation/{{Animaniacs}}'', ''WesternAnimation/TinyToonAdventures'', and ''WesternAnimation/PinkyAndTheBrain'' may have helped them grow to be loved by many on Website/FanFictionDotNet.
* One of the most prevalent type of ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fan fics and fan works in general. The most regular kinds are those such as ''FanFic/BetterLivingThroughScienceAndPonies'' (''VideoGame/{{Portal}}'') and ''WebAnimation/TurnaboutStorm'' (''VisualNovel/AceAttorney''), where another series' characters are transported to Equestria, sometimes [[FisherKingdom turning into ponies in the process]], and {{Fusion Fic}}s such as ''Fanfic/FalloutEquestria'' ([[VideoGame/{{Fallout}} guess]]) and ''Fanfic/FriendsOfASolarEmpire'' (''VideoGame/SinsOfASolarEmpire'').
** Another example is ''Fanfic/TheLittlePonyLegend'', crossing over Friendship is Magic with WesternAnimation/TheLegendOfKorra. It's also something of a self-insert fic, as the ponies are "inserted" into Korra's plot and vice versa over the course of the seven fics present.
* Originally, the intent was for ''Fanfic/MyBravePonyStarfleetMagic''; to be completely separate from ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', but eventually it became a crossover, and then was fully integrated into a ''Franchise/MyLittlePony'' story.
* There's a fanfic series by [[https://www.fanfiction.net/u/4205892/GamesMaster64 GamesMaster64]] called "The Legend of Hyrule Hearts" (shortened to [="LoHH"=] by the author), which crosses over [[Franchise/TheLegendOfZelda The Legend of Zelda]] and [[Franchise/KingdomHearts Kingdom Hearts]]... for the first story anyway... WordOfGod states that the series will cross over into multi-crossover territory in later parts. The second part [[spoiler: will establish pairings. Link is said to be paired with Sia, the titular princess of VideoGame/LadySia and Sora will be paired with Sheba from VideoGame/GoldenSun]]. How that will work out remains to be seen...
** WordOfGod still hasn't mentioned ''how'' the characters will travel to the other worlds, but perhaps that'd get into spoiler territory.
*** WordOfGod states there's also 20 parts planned, with about five specials. This guy's in it for the long haul. The series appears to be dead, but the author blames it on writer's block and real-life being busy.
* It's easier to count the things that Naruto hasn't had crossovers with when it's had crossovers with ''ComicStrip/TheBoondocks'', ''VideoGame/DukeNukem'', ''WesternAnimation/AquaTeenHungerForce'', ''Film/MeanGirls'', ''Godzilla'', ''Franchise/FridayThe13th'' and probably the strangest with ''Series/MarriedWithChildren''.
* ''Fanfic/TheMountainAndTheWolf'': ''Series/GameOfThrones'' meets ''TabletopGame/WarhammerFantasy''. More specifically, the Mountain's duel with Oberyn Martell happens against someone very different, very large, and very keen about certain bloodthirsty gods...
* {{Fanfic/Myrmridon}} by Ser Serendipity has Team 8 from ''Manga/{{Naruto}}'' take on a mission in ''Manga/HunterXHunter''[=’s=] NGL.
* [[http://www.fanfiction.net/s/7897742/1/Platinum-Angel This fic]], a crossover of ''Manga/{{Chobits}}'' with, of all things, ''Franchise/AssassinsCreed'' (trope page [[FanFic/PlatinumAngel here]]). Word from the author is that the eventual sequel will add ''Manga/MidoriDays'' to the mix as well.
* ''[[FanFic/TheLongRoad2015 The Long Road]]'' is an AlternateTimeline crossover story of the WesternAnimation/RiseOfTheGuardians and WesternAnimation/HowToTrainYourDragon canons, not to be confused with a Dragon Ball Z fanfic [[Fanfic/TheLongRoad of the same name]].
* Fanfic/OfLovebugsAndPromises] is an Avengers {{Kid Fic}} set in the Series/{{White Collar}} universe with Phil Coulson being an agent of (a different state's branch of) the FBI's White Collar Unit.
* This is basically the whole point of FanFic/TheOmniverseEvent. Currently, the fandoms include ComicStrip/CalvinAndHobbes, Franchise/BerniceSummerfield, Franchise/YuGiOh, and Series/StarTrekVoyager, with the promise of a lot more on the way.
* ''[[https://archiveofourown.org/works/16749352/chapters/39293203 Only Void Remains]]'' is a crossover of ''Manga/BungoStrayDogs'' and ''Anime/PuellaMagiMadokaMagica'' and follows the plot of the Light Novel ''Dazai Osamu and the Dark Era'' roughly. Uncommonly for the genre, it is an amalgamation of the two universes (the characters from Bungo Stray Dogs follow the laws of the Madoka Magica universe) and the characters of the franchises don't meet eachother. The endnote implies that it is part of a larger crossover universe.
* Decent [[http://www.fanfiction.net/Pokemon_and_Digimon_Crossovers/80/257/ Pokemon/Digimon crossovers]] are not that common in fanfiction, but of late some interesting new submissions have popped up. SturgeonsLaw may be applicable due to grammar issues, but those with decent grammar tend to be alright.
* ''[[http://www.fanfiction.net/s/7843635/1/Portalborn Portalborn]]'' is actually inspired by the [[VideoGame/{{Portal2}} Portal 2 Mod]] for [[VideoGame/TheElderScrollsVSkyrim Skyrim.]] In starts off using the original elements of Fall of the Space Core after pitting [[{{Tsundere}} The]] [[BloodKnight Dragonborn]] with the weird and cooky [[CrazySurvivalist Doug Rattmann]]. It gets crazy, then evolves with a mysterious and adventurous plot.
* ''FanFic/QuinnInWonderland:'' [[Series/{{Glee}} Quinn Fabray]] falls DownTheRabbitHole and ends up in [[Literature/AliceInWonderland Wonderland]]
* The ''Manga/RanmaOneHalf'' fandom loves to create crossovers. There exists several archives devoted to them. Particularly common are crossovers with ''Franchise/SailorMoon'' which has a sub genre called the FukuFic that has more fan fics written for it than most anime has fan fics total.
* Raquaza Master's [[http://s1.zetaboards.com/PokeTown_2/index/ Pokemon Squad]] fanfics are supposed to combine the characters from Franchise/{{Pokemon}}, ''WesternAnimation/KaBlam!'', ''Series/BarneyAndFriends'' (Barney is going to be one of the main antagonists), ''WesternAnimation/DannyPhantom'', ''WesternAnimation/{{Animaniacs}}'', ''Series/SesameStreet'' (Elmo's going to be an upcoming villain), many video games, and much, much more.
* The fancomic ''Webcomic/{{Roommates}}'' by [[http://asherhyder.deviantart.com/ Ashe Rhyder]] and its spinoff ''Webcomic/GirlsNextDoor'' by [[http://pika-la-cynique.deviantart.com/ Pika la Cynique]] are this -- a crossover between ''Film/{{Labyrinth}}'', ''Theatre/ThePhantomOfTheOpera'', ''Franchise/PiratesOfTheCaribbean'', ''Literature/LesMiserables'', and occasionally ''Literature/HarryPotter'' -- the many fandoms that appeared only once or twice are too numerous to count. Both by now run rather independently of each other, with a frequent ContinuityNod and ShoutOut to each other during their many, many storylines. And they are also awesome.
* If you [[AlternateUniverseFic relocate]] ''WesternAnimation/ChipNDaleRescueRangers'' from TheEighties to TheSeventies, you can cross it over with ''Series/{{Kojak}}''. ''Fanfic/TheRodSquad'' does so briefly.
* Creator/RoseOfPollux writes these occasionally.
* The ''Fanfic/RoyalHeights'' combines three animated shows and places them into a sci-fi/fantasy school setting. But not in the way one would expect.
* [[RulesOfTheInternet Rule ⑨]]: If it exists, there is a crossover with ''VideoGame/{{Touhou}}''. [[FanficRecs/TouhouCrossover The series even has its own article.]]
* Due to their popularity, it's very easy to find on [=deviantArt=] crossovers involving ''LetsPlay/TheRunawayGuys'', mostly by [=ThatOneNPC=]. The guys have crossed over with such works as ''Film/TheWizardOfOz'', ''Literature/AliceInWonderland'', ''VideoGame/{{Portal2}}'', ''VideoGame/{{Slender}}'', ''VideoGame/ProfessorLaytonVSAceAttorney'' and ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' ([[http://fav.me/d4vqwcn no really]]), to name a few.
** Each of the guys themselves has been subject to individual crossover fanart. For instance, [[http://fav.me/d4wius7 here]] is fanart crossing over LetsPlay/{{Chuggaaconroy}} with VideoGame/ProfessorLayton. (Chugga liked it, by the way.)
* ''Fanfic/SayItThrice'' is a blending of ''WesternAnimation/DannyPhantom'' and the film ''Film/{{Beetlejuice}}.'' Two years post-movie, Lydia is forced by circumstance to move to Amity Park to live with her mother's sister, and befriends Danny, Sam, and Tucker.
* [[http://www.fanfiction.net/community/Seanzilla115-s-Multi-crossover-stadium/86737/3/0/1/ Seanzilla115's Multi crossover stadium]], This Fanfiction community contains some of the greatest crossover stories by the greatist authors Fanfiction.Net has to offer.
* ''FanFic/ShinjiAndWarhammer40K'' is sort of an odd example. It is not a story where the universes meet, being more of a ForWantOfANail story about Shinji getting a large amount of TabletopGame/{{Warhammer 40000}} pieces and rulebooks as a child. His different (happier) childhood makes for a more dynamic protagonist and leads him to influence the rest of the cast into making things that fit the 40K ethos more than the original Evangelion series did. It's not the straightest example of a universe to universe CrossOver.
* ''Fanfic/SOE2LoneHeirOfKrypton'': Between Franchise/{{Superman}} and ''Anime/NeonGenesisEvangelion''. Asuka knew she had been conceived by sperm donor. What she did not knew was her biological father was an alien from another planet, and his DNA confered vast powers on her. Shortly after finding out about it, she becomes ''Comicbook/PowerGirl'' and later ''Comicbook/{{Supergirl}}''.
* ''FanFic/ThousandShinji'': Between ''Anime/NeonGenesisEvangelion'' and ''TabletopGame/{{Warhammer 40000}}''. A Sorcerer of Thousand Sons Legion fumbles a spell and travels back in time, finding a young Shinji Ikari and raising him.
* ''Fanfic/TheVampireOfSteel'' is a cross between ''Series/BuffyTheVampireSlayer'' and ''ComicBook/{{Supergirl}}'', set in a [[Franchise/TheDCU DC Universe]] where Sunnydale exists.
* Is there anyone Franchise/SonicTheHedgehog hasn't met yet? The blue hedgehog has had crossovers with [[http://www.fanfiction.net/Sonic_the_Hedgehog_and_Percy_Jackson_and_the_Olympians_Crossovers/253/2622/ Percy Jackson]], [[http://www.fanfiction.net/Sonic_the_Hedgehog_and_Godzilla_Crossovers/253/448/ Godzilla]], [[http://www.fanfiction.net/Transformers_Beast_Wars_and_Sonic_the_Hedgehog_Crossovers/65/253/ Transformers]], [[http://www.fanfiction.net/Sonic_the_Hedgehog_and_Halo_Crossovers/253/1342/ Halo]], [[http://www.fanfiction.net/Sonic_the_Hedgehog_and_iCarly_Crossovers/253/2898/ iCarly]], [[http://www.fanfiction.net/Sonic_the_Hedgehog_and_Gorillaz_Crossovers/253/2340/ Gorillaz]], [[http://www.fanfiction.net/Mighty_Ducks_and_Sonic_the_Hedgehog_Crossovers/243/253/ the Mighty Ducks]], [[FanFic/FuckTheJesusBeam Tengen Toppa Gurren Lagann]], [[https://www.fanfiction.net/Sonic-the-Hedgehog-and-Strawberry-Shortcake-series-Crossovers/253/4511/ Strawberry Shortcake]] and [[https://www.fanfiction.net/Sonic-the-Hedgehog-and-Tinkerbell-Crossovers/253/3713/ Tinkerbell]]. Are any of these even remotely connected?
** But [[http://www.fanfiction.net/Sonic_the_Hedgehog_and_Mario_Crossovers/253/347/ we all know who the big winner is...]]
** [[http://www.fanfiction.net/s/7891955/1/Sonic-Generations-Friendship-is-Timeless This]] fanfiction crosses over ''Franchise/SonicTheHedgehog'' with the cast of ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', in a reimagining of the plot of ''VideoGame/SonicGenerations''. It goes far beyond what the original game gives, showing the author did their research. For instance, Ponyville serves as the central [[NoPunIntended hub]], similar to the White Void in the game, the Death Egg Robot battle in the original is replaced with Nightmare Moon and in this fanfiction, Tails fights Metal Sonic instead of Sonic, possibly a reference to ''VideoGame/SonicTheHedgehog4''. The author has even adapted the updated canon of Friendship is Magic into the fanfic. However, how the author intends to implement alicorn Twilight is currently unknown.
** ''VideoGame/SonicManiaAndHatsuneMiku'': A ''very'' well-done GameMod of ''VideoGame/SonicMania'' that replaces the titular character with [[Music/{{Vocaloid}} Hatsune Miku]] wearing a Sonic parka, [[{{Understatement}} amongst a few other things]].
* It's crazy just how many crossovers on Website/FanFictionDotNet exist between ''Franchise/SonicTheHedgehog'' and ''Franchise/SuperMarioBros''. Sure, [[VideoGame/MarioAndSonicAtTheOlympicGames this may have become canon]] but authors were doing it way before then.
* Franchise/SpiderMan has a slew of crossovers on Website/FanFictionDotNet. [[http://www.fanfiction.net/s/5011834/1/Web_of_Shadow_Fallout This one]] crossed with the TeenageMutantNinjaTurtles, and [[http://www.fanfiction.net/s/3914495/1/A_Hospital_In_Jersey this one]] crossed with ''Series/{{House}}'' are quite good.
* ''StarWars'' and ''Franchise/StarTrek''. The rivalry between their fanbases and The UltimateShowdownOfUltimateDestiny makes it a bygone conclusion feature some, and for those to require at least one major battle between the United Federation of Planets and the Galactic Empire, but there are certain exceptions.
** Another good one is [[http://sfdebris.com/unity.asp Unity]] by notable contributor WebSite/SFDebris. What is a wormhole was connected from the Delta Quadrant circa Voyager's fifth season to the Star Wars Universe circa early Return of The Jedi, (disrupting the Rebel Alliance's attempt to attack the second Death Star.) Involved every character from TNG forward moving well into the future and exploring all the potential interactions in detail.
** To complete the trifecta of renowned Star Wars vs. Star Trek fanfics, there's [[http://bbs.stardestroyer.net/viewtopic.php?t=404&highlight= StarCrossed]].
* ''FanFic/{{Super Miyuki World}}'':VideoGame/{{Super Mario World}} with [[Manga/{{Lucky Star}} Miyuki Takara]] as the protagonist, anyone?
* ''FanFic/{{Survivability}}'': The ''Manga/{{Bleach}}'' universe with an original plot, starring characters from different KPop groups (Music/DongBangShinKi, Music/SHINee, Big Bang, Music/SuperJunior, Music/B2ST, +other solo singers and actors).
* [[http://www.fanfiction.net/s/6095074/1/Takamachi_Nanoha_of_2814 Takamachi Nanoha of 2814]] is a ''Anime/MagicalGirlLyricalNanoha'' Crossover with ''Comicbook/GreenLantern''. Then, it started to cross over with ''everything'' by chapter 3. Written by the almost infamous Shadow Crystal Mage, so you know it's good. [[FanFic/TakamachiNanohaOf2814 Now with its own page.]]
* ''Fanfic/TangledAdventuresInArendelle'': Going on their honeymoon, the main cast of Disney/{{Tangled}} goes to visit [[Disney/{{Frozen}} Arendelle]] for a month..[[OhCrap just at Queen Elsa's coronation]].
* ''[[http://www.fanfiction.net/s/7941617/1/To_Kill_A_Thief To Kill A Thief]]'' is ''Manga/KamikazeKaitouJeanne'' [[JustForFun/XMeetsY meets]] ''Manga/DeathNote''.
* ''[[{{Fanfic/TokimekiPokeLiveAndTwinbee}} Tokimeki PokéLive! and Twinbee]]'' is a lighthearted Seinen style crossover between ''{{Franchise/Pokemon}}'', ''Franchise/LoveLive'', ''VisualNovel/TokimekiMemorial'' and ''VideoGame/TwinBee'' that focuses on female characters from the ''Pokémon'' games, ''VideoGame/LoveLiveSchoolIdolFestival'', ''Love Live! Perfect Dream Project'', ''Tokimeki Memorial:Forever with You'' and ''Twinbee'' with female characters from other franchises making cameo appearances in various main stories. And there's also a Shonen style (Although still pretty lighthearted) spin off called ''Tokimeki PokéLive! and Twinbee Side Stories'' that have male Pokémon characters making appearances depending on the story arc and in addition, focuses more on characters who don't appear in the main stories at all or who don't appear that often in the main stories.
* At least 300 crossovers of ''WesternAnimation/TotalDrama'' are available on fanfiction.net
** [[http://www.fanfiction.net/~supertrip One writer]] has written the aptly named "Total Crossover" series. They are currently working on ''3'' installments at the same time. [[spoiler: The scenes with [[WesternAnimation/TheAdventuresOfJimmyNeutronBoyGenius Jimmy Neutron]] border on RevengeFic.]]
* This [[http://www.fanfiction.net/s/7878969/1/The-Transformers-Marvel-Continuty fanfic]] is a shared universe for the Transformers and Marvel characters. as of 2013 an standalone Marvel and an official crossover story are yet to be written, but there plans to do so
* ''Fanfic/ToInfinity'' is a ''Toys/{{Bionicle}}'' and ''Franchise/{{Halo}}'' cross-over.
* ''Fanfic/TranspositionF'' is a crossover between ''WebAnimation/{{RWBY}}'' and ''Anime/DragonBallZ''.
* Likewise, you will be able to find crossovers between ''Literature/{{Twilight}}'' and just about anything
** Not many Crossover fics have managed to be as awesome as ''[[http://www.fanfiction.net/s/4821971/1/Edward_meets_Sherlock_Holmes Sherlock Holmes vs Edward Cullen]]''.
* ''Fanfic/WeissReacts'' is primarily in the ''WebAnimation/RWBY'' universe, but shares a universe with ''Manga/{{Chobits}}'', ''[[Franchise/ShinMegamiTenseiPersona Persona]]'', the ''Franchise/{{Nasuverse}}'', ''Manga/FruitsBasket'', ''Manga/AiYoriAoshi'' and ''Anime/AKB0048'', with elements from ''Anime/CodeGeass'', ''Franchise/FireEmblem'', ''Anime/GuiltyCrown'' and ''VideoGame/LeagueOfLegends'', of all things.
* When ''Fanfic/WithStringsAttached'' was first conceived, it was supposed to be a [[Music/TheBeatles Beatles]]/''TabletopGame/DungeonsAndDragons'' crossover. Luckily, the author quickly matured out of that notion, and the story turned into something far more interesting and complex, though its {{RPG}} roots are quite evident still.
* The longtime crossover champion for TV shows is ''The Witness'' by Michele Martin, which managed to cross ''Series/ForeverKnight'', ''Series/{{Highlander}}'', ''Series/TheXFiles'', ''Series/QuantumLeap'', and the ''Series/{{Starman}}'' TV series. Believe it or not, the fic manages to keep all those balls in the air successfully, and even bring in cameos from a few other series, all while following a coherent plot and keeping the characters in-character!
* ''Fanfic/{{Wonderful}}'' is a crossover between ''Literature/{{Worm}}'' and ''VideoGame/TheWonderful101'' where "Worm" main character Taylor gains a different power set and becomes the hero Wonder Red.
* Literature/TheWTFJournal crosses over at least five fandoms.
* ''WebAnimation/ZanyToTheMax'' has an episode where the Warners (it's an ''WesternAnimation/{{Animaniacs}}'' fan series) enter the world of ''Literature/TheTimeMachine'' and try to help the Time Traveler find Weena as part of a contest. If they win, they will be able to [[ImTakingHerHomeWithMe take Weena home with them]]. [[spoiler: They don't win. WebAnimation/{{Homest|arRunner}}ripe [[AuthorAvatar Runner]] does instead.]] The episode is implied to turn into a MassiveMultiplayerCrossover by the end.
-->'''News Reporter''': We just got reports of [[WesternAnimation/ThePowerpuffGirls three super-powered sisters from the city of Townsville, Animenia]], in the Warner Bros. studio.\\
'''Yakko''': Super-powered sisters? Townsville, Animenia? [[BorrowedCatchPhrase Yes!]] Come, Warners. We must prepare for tomorrow.\\
'''Wakko''': Why, Yakko? What are we going to do tomorrow?\\
'''Yakko''': [[WesternAnimation/PinkyAndTheBrain The same thing we do every day, Wakko]]. Unfortunately, I have no idea what that is.\\
'''WesternAnimation/PinkyAndTheBrain''': They're zany, and they're the Warners, eight, eight, eight, eight, eight.
** There is a crossover episode in every season.
*** In fact, Season 3 consists of ''[[UpToEleven entirely]]'' crossover episodes!
* An author on [=FFnet=] has created [[http://www.fanfiction.net/s/2322545/1/Halo_Republic_Commando a crossover]] between ''Franchise/StarWars'' and ''Franchise/{{Halo}}'' where the characters of ''VideoGame/StarWarsRepublicCommando'' (and some friends and enemies) meet Master Chief and company in the ''Halo'' universe. There is a sequel that takes place mostly in the ''Star Wars'' universe during the events of the Original Trilogy.
* Another author has crossed over ''WesternAnimation/MegasXLR'' with [[http://www.fanfiction.net/s/7777108/1/The_Golem_of_New_Jersey Harry Potter]], [[http://www.fanfiction.net/s/7734042/1/Megas_Five0 Lilo & Stitch]] and [[http://www.fanfiction.net/s/7929483/1/Perry_XLP Phineas & Ferb]], crossed over Phineas & Ferb with [[http://www.fanfiction.net/s/7712752/1/Seasonal_Sentai_Summerranger Super Sentai]] and [[http://www.fanfiction.net/s/7858523/1/The_Platypus_Rider Kamen Rider]], and then combined all the previous into a [[http://www.fanfiction.net/s/7998417/1/Megas_Final_Wars Mega Crossover]]
* These [[https://www.youtube.com/watch?v=O2sUOlf-DVs two]] [[https://www.youtube.com/watch?v=0SRUCfgSj_0 videos]] make a sort of crossover between ''Manga/LuckyStar'' and ''LightNovel/HaruhiSuzumiya''.
* In Anime fanfiction (and sometimes in other media), a quite common way to establish a plot, especially in PeggySue fics, is to have a wish be granted by [[Manga/AhMyGoddess Belldandy or her sisters]]. Whether this crossover is minor or major varies between fics.
* One author has even crossed over (at various times) Transformers with [[http://www.transformersfanfic.com/viewstory.php?sid=2439&chapter=1 Knight Rider]], The [[http://www.transformersfanfic.com/viewstory.php?sid=865&chapter=1 Real Ghostbusters]], Franchise/MastersOfTheUniverse, [[http://www.transformersfanfic.com/viewstory.php?sid=873&chapter=1 Sailor]] [[http://www.transformersfanfic.com/viewstory.php?sid=866&chapter=1 Moon]], [[http://shebakoby.deviantart.com/art/Jewel-Of-4-Sparks-32879715 Inuyasha]], and [[http://www.transformersfanfic.com/viewstory.php?sid=5021&chapter=1 Judge Judy]].
* There are a lot of fanarts involving [[Disney/TheJungleBook Kaa]] the Snake hypnotizing various victims. Google search "Kaa" and you'll see what the deal is.
* While not a FanFic, [[https://www.youtube.com/user/LogoAttitude this Youtube user]] makes videos which present "what if" situations dealing with [[VanityPlate television logos]], which also includes gems like [[https://www.youtube.com/watch?v=r6r3yR0PzCE "What if Steven Bochco collaborated with 4K!ds Entertainment?"]].
* [[https://www.fanfiction.net/s/3510991/1/One-Piece-A-Smash-Adventure One Piece: A Smash Adventure]] by [[https://www.fanfiction.net/u/794512/Specter24 Spectre24]] has Manga/OnePiece characters crossover with various Nintendo franchises related to VideoGame/SuperSmashBros
** Due to it's increased popularity, other users have attempted to make similar crossovers based off this. Most notable is [[https://www.fanfiction.net/u/447022/Game2002 Game2002]] who basically took the same concept, this time with Touhou characters. His [[https://www.fanfiction.net/s/5681268/1/Touhou-Journey-to-the-Smashing-Beyond crossover]] was also a huge hit among fans.
* FanFic/MegamiNoHanabira is a crossover between the unrelentingly dark Franchise/ShinMegamiTensei and the SugarWiki/{{WAFF}}-y GirlsLove {{Eroge}} Sono Hanabira Ni Kuchizuke Wo.
* FanFic/MutantStorm is a Franchise/HarryPotter[=/=]Franchise/XMen crossover where Jean Grey is Lily Potter's twin sister, and she decides to take Harry into her family after the events in Literature/HarryPotterAndTheOrderOfThePhoenix
* This song combines ''Anime/{{Pokemon}}'' and ''Anime/{{Digimon}}'' to the tune of ''Disney/{{Mulan}}''.
* Creator/HansVonHozel:
--> "One day, Manga/{{Naruto}} was sit on a beach.
-->It was many suns in the sky.
-->Suddenly, [[Franchise/DragonBall Vegeta]]!"
** ''World of Danube: A ''Film/MammaMia[=/=]''Literature/HarryPotter'' crossover''.
* ''Fanfic/SuperheroRPF'' is mainly a Comicbook/{{Ms Marvel|2014}} / Comicbook/LokiAgentOfAsgard crossover (had some cameos from other Marvel titles like the Comicbook/YoungAvengers).
* ''Fanfic/{{Ultrasonic}}'' is a crossover between ''WesternAnimation/MiraculousLadybug'' and ''Disney/{{Zootopia}}'', with Marinette being somehow transported to Zootopia with only Tikki for company, and her nemesis following her there a year later.
* ''FanFic/WaitingInSin'' is a crossover between ''Anime/{{Bleach}}'' and ''Literature/HarryPotter'' where Ulquiorra Schiffer is reborn as Harry Potter after his death.
* ''FanFic/WaterAreobicsForTheAquaphobic'' centers on most of Hogwarts' student body (and a couple of Death Eaters) being cursed into various forms after Umbridge brings them on a poorly-thought out field trip to Jusenkyo from ''Manga/RanmaOneHalf''. [[VideoGame/TombRaider Lara Croft]] is also mentioned in passing as giving no end of trouble to the Gringotts employees in Egypt.
* ''Fanfic/WhenTheDoctorWentToDownton'' is, as the title suggests, [[Series/DoctorWho the Doctor]] going to [[Series/DowntonAbbey Downton]].
* ''FanFic/{{Worldfall}}'' is a crossover between Literature/{{Worldwar}} and Literature/{{Footfall}} set on an Earth that its {{Twenty Minutes into the Future}}.
* ''[[http://archiveofourown.org/works/10027490 Operation Epic Beer Run]]'' and ''[[http://archiveofourown.org/works/10027490 And Miles To Go Before I Sleep]]'' cross ''Film/TheMartian'' with the Franchise/MarvelCinematicUniverse via [[spoiler: Dr. Beck being one of Bucky Barnes's descendants]].
* ''FanFic/ThreeSpecialSteps'' is a crossover between ''WesternAnimation/Incredibles2'' and ''Disney/MeetTheRobinsons''.
* ''FanFic/BlackBeastOfTenguCity'' is a crossover between ''VideoGame/BlazBlue'' and ''LightNovel/DateALive''.
* In ''Fanfic/AmazingFantasy'', Izuku turns down [[ForWantOfANail turns down an alleyway]] instead of walking under a bridge and gets bitten by a genetically-altered (and possibly radioactive) spider, giving him the powers of Franchise/SpiderMan. A few weeks later, a [[OlderAndWiser 47-year-old]] Peter Parker drops into Izuku's universe after a brawl with Mysterio.
* ''Fanfic/WanderOverFostersAUOneshot'' Crossover between two cartoons ''WesternAnimation/WanderOverYonder'' and ''WesternAnimation/FostersHomeForImaginaryFriends''.
* ''Fanfic/TheSupermen'' is a crossover between ''Franchise/ResidentEvil'' (the game canon, not the films) and ''Franchise/JusticeLeagueOfAmerica'' (comics canon, although it appears to be a mix of pre- and post-New 52). It involves Wesker ending up in the DC universe [[NotQuiteDead after the events of]] ''VideoGame/ResidentEvil5''.
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{{Crossover}}s are huge in all fanworks, and one biggest reasons to create them. Without pesky things like {{UsefulNotes/Copyright}}s or {{UsefulNotes/Trademark}}s, it's incredibly easy to combine any and all works together.
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* ''FanFic/ACertainMagicalFriendship'' crosses ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' with ''LightNovel/ACertainMagicalIndex'' using a magic portal that rebuilds characters as they move between the two settings. In Academy City, Twilight is a human cabal magician. In Ponyvile, Misaka is a pegasus who likes to keep lightning bolts in her fur. Which is fine, right up until villains start moving between the two worlds as well...
* ''[[Fanfic/AndersonQuestKillingVampiresAndWerewolvesAndLeprechuans Anderson Quest]]'' is a crossover between ''WebVideo/HellsingUltimateAbridged'' and ''{{VideoGame/Bloodborne}}'' where the infamous [[BadassPreacher Alexander]] [[BloodKnight Anderson]] is dropped into the Hunter's Dream.
* ''FanFic/ADarkKnightOverSinCity''. It's rather obvious what it is about, going by the [[ExactlyWhatItSaysOnTheTin title]].
* ''Fanfic/ATriangleInTheStars'' features ''WesternAnimation/StevenUniverse'' and ''WesternAnimation/GravityFalls'' in one combined world, with Steven Universe's world being the more primary one. Only Bill Cipher shows up there [[spoiler:at first]]...
* In the ''WesternAnimation/JackieChanAdventures'' and ''WesternAnimation/TeenTitans'' crossover fanfiction ''Fanfic/AShadowOfTheTitans'', Jade ends up in the Teen Titans universe.
* In ''Manga/YuGiOh'' fandom there's ''Blog/AskDarkHourBakura'' which is a CharacterBlog about a crossover between the characters of Duel Monsters and the world of ''VideoGame/{{Persona 3}}''.
* In ''Fanfic/HauntedMansionAndTheHatboxGhost'', following the "official" crossover with "The Nightmare before Christmas" that the "Haunted Mansion Holidays" event is, the characters from this movie are sometimes featured in the stories. ...Ah, and the Grinch from "How the Grinch stole Christmas" made a cameo ONCE in a single-panel comic, too.
* Even though the first story of ''Fanfic/AStickySituation'' remains solidly in the ''[[Anime/DigimonTamers Digimon]]'' season three universe, the second story tosses several of the characters into ''WesternAnimation/StarWarsTheCloneWars'' due to a dimension-traveling Digimon called Parallelmon (a {{Canon}} digimon, not an OriginalCharacter of the author). It is very well written and very entertaining.
* FanFic/{{Avalon}} is a bit of an odd example, being a cross between mainly ''Anime/NeonGenesisEvangelion'' and the ''Franchise/MarvelCinematicUniverse'' as the forefront, but with other Marvel properties also being mentioned as well as references to other fictional settings existing within the story. So far Manga/RosarioToVampire and the Franchise/{{Stargateverse}} have explicitly been mentioned as part of the shared universe.
* [[http://www.fanfiction.net/s/8985296/1/Avengers-The-Next-Generation This crossover]] between ''Film/{{The Avengers|2012}}'' and ''Film/PitchPerfect''. It features Beca as Tony and Pepper's daughter and the rest of the cast as various superheroes.
* ''Film/{{The Avengers|2012}}'' crossed with ''Literature/TheHungerGames'' has some surprisingly good crossovers, including the [[AnyoneCanDie heartbreaking]] ''[[http://archiveofourown.org/works/413095/chapters/685873 Embrace the Fire]]'' and the [[SparedByTheAdaptation less heartbreaking]] ''[[https://www.fanfiction.net/s/9775871/1/Something-to-Avenge Something To Avenge]]''.
* ''Fanfic/TheBankCalledYourRealityCheckBounced'' brings the Hosts from ''Anime/OuranHighSchoolHostClub'' into the post-Promised Day world of ''Manga/FullmetalAlchemist''. It goes about as well as you might expect, with Tamaki driving pretty much everybody up the wall.
* [[http://games.adultfanfiction.net/story.php?no=600086731 Bayonsiders]] has War from ''VideoGame/{{Darksiders}}'' and Bayonetta from ''VideoGame/{{Bayonetta}}'' meet up, have sex, beat up angels, beat up demons, and have sex while beating up angels and demons at the same time. All while trying to stay in continuity of both games.
* ''FanFic/BetweenMinds'' crosses {{Videogame/Portal}} and VideoGame/{{HalfLife}}.
* ''FanFic/BloodAndRevolution'' is a MassivelyMultiplayerCrossover that starts and remains primarily ''Manga/RurouniKenshin'' with a heavy dose of ''Manga/YuGiOh''.
* [[http://www.fanfiction.net/s/5493333/1/Brother_Bubbles Brother Bubbles]]. Space Marine Terminator finds himself in Rapture. Then meets a Little Sister.
* ''FanFic/BondBreaker'' has a SelfInsert of the author get pulled around the multiverse by a race of godlike beings wanting to find the answer to the "is there a God?" question. He gets to visit {{Manga/Naruto}}, [[Anime/NeonGenesisEvangelion NGE]], VideoGame/MassEffect, Literature/HarryPotter, VideoGame/TheLegendOfZelda, {{Disney/Frozen}}, Anime/SwordArtOnline, Franchise/StarWars, ''TabletopGame/{{Warhammer 40000}}'', VisualNovel/FateStayNight and [[VideoGame/TheLegendOfZeldaTheWindWaker Wind Waker]], to name a few.
* [[FanFic/BrutalSeries Brutal, Horrible, and What If]] is a series of crossovers between ''Manga/AxisPowersHetalia'' and the Hunger Games. Also AlternateUniverse.
* ''Series/BuffyTheVampireSlayer'' has a natural crossover point in the second season episode "Halloween", in which the main characters turn into their costumes for the night. The portal Buffy jumps through in the Fifth Season finale also provides a great opportunity for Buffy to visit some other show or story, as does the presence of [[RealityWarper Reality-Warping vengeance demons]].
** ''FanFic/OriginStory'' is a three way {{crossover}}: of ''Series/BuffyTheVampireSlayer'' and ''ComicBook/PowerGirl'', but set in the Franchise/MarvelUniverse. And it makes use of the "Halloween" episode for the justification of its crossover.
** ''FanFic/ASparkOfGenius'' is a three way {{Crossover}} between ''Series/BuffyTheVampireSlayer'', ''WesternAnimation/JusticeLeague'' and ''Webcomic/GirlGenius'' set in a DC universe that takes elements from both the cartoons and the comics. This story uses the "Halloween" episode for set up.
* ''[[http://z4.invisionfree.com/Refia/index.php?showtopic=1010 Callisto Meets The Powerpuff Girls]]'' sends one of the [[BigBad Big Bad]] villains of ''Series/XenaWarriorPrincess'' to Townsville, and naturally WesternAnimation/ThePowerpuffGirls are called in to save the day.
* ''Fanfic/CalvinAndHobbesTheSeries'' has a crossover ''episode'' - "Calvin's Franchise/{{Batman}} Adventure".
* ''Fanfic/ChildrenOfAnElderGod'': Between ''Anime/NeonGenesisEvangelion'' and the Franchise/CthulhuMythos. The Children fight [[EldritchAbomination the Great Old Ones and the Outer Gods]] in lieu of [[{{Robeast}} Angels]], and steal their powers upon slaying them.
* ''WesternAnimation/CatDog'' has even been crossed over with the {{anime}} ''[[Franchise/LoveLive Love Live! School Idol Project]]'' of all things on Website/DeviantArt. [[TalkingAnimal Dog]] and [[TheDitz Honoka Kousaka]] as friends, anyone?
* There are a few fics that cross over all the Creator/{{Nicktoons}}. One that does this along with extreme AU along with Alternate History (Vlad is now king of an FictionalCounterpart of America!) would be [[http://chesspiece.smackjeeves.com Chess Piece]] by NeoYi. It's filled with tons of continuity nods and has everything, from ''WesternAnimation/TheWildThornberrys'', ''WesternAnimation/InvaderZim'', and ''WesternAnimation/DoraTheExplorer'' to ''WesternAnimation/{{Doug}}'', ''WesternAnimation/AaahhRealMonsters'', ''WesternAnimation/CatDog'', and ''WesternAnimation/MyLifeAsATeenageRobot''. Seriously; it is also [[RuleOfCool awesome]].
* [[https://www.fanfiction.net/s/12381819/1/The-Connie-Ronnie-Switcheroo The Connie-Ronnie Switcheroo]] largely takes place in the ''WesternAnimation/TheLoudHouse'' universe, where two of the characters are observing an AlternateUniverse where one of those characters (Ronnie Anne Santiago) has swapped places with a character from ''WesternAnimation/StevenUniverse'' (Connie Maheswaran), resulting in the two characters befriending the opposite main characters (Lincoln Loud and Steven Universe) of those respective shows. This is achieved by using mutliversal transmitter goggles, which were apparently borrowed from [[WesternAnimation/RickAndMorty Rick Sanchez]] of all people.
* ''Fanfic/TheCriesOfHaruhiSuzumiya'' is a crossover between ''LightNovel/HaruhiSuzumiya'' and ''VisualNovel/HigurashiWhenTheyCry''.
* The game-idea series [[http://crossoverx.wikia.com/wiki/Crossover_X_Wiki Crossover X]] practically ''lives'' on this trope. It even uses the word "crossover" in its name.
* Fanfic/DantesNightAtFreddys is a crossover between ''VideoGame/DevilMayCry'' and ''VideoGame/FiveNightsAtFreddys'' in which the protagonist of the former delivers a CurbStompBattle to the villains of the latter.
* ''Fanfic/DeanThomasAndTheCurseOfJumanji'' is a crossover fic between ''Franchise/HarryPotter'' and ''Franchise/{{Jumanji}}''
* [[http://www.fanfiction.net/s/10020026/1/Delivered-From-Frollo Delivered From Frollo]] crosses ''The Hunchback of Notre Dame'' with ''Fantasia''.
* ''Fanfic/DemonOfJustice'' is older than Website/FanFictionDotNet and crosses Anime/MobileSuitGundamWing with [[Literature/TheWarGods Oath of Swords]], a high fantasy series.
* ''Fanfic/DieAbenteuerVonLucinaUndLink'' is a German fanfiction. It's a crossover between ''VideoGame/TheLegendOfZeldaSkywardSword'' and ''VideoGame/FireEmblemAwakening''
* [[http://www.fanfiction.net/s/5803383/1/Divine_Intervention Divine Intervention]] The [[Film/TheBoondockSaints MacManus brothers]] meet the [[Series/{{Supernatural}} Winchester brothers.]] And it is COOL.
* A favourite for many seems to be ''Series/DoctorWho'', due to the remarkable ease with which the Doctor can be inserted in any story just by having the TARDIS land there. One of the most famous, ''Fanfic/TheManWithNoName, is a ''Series/{{Firefly}}'' / ''Doctor Who'' crossover, which some say should be officially added to {{Canon}}.
** Yet it VERY strangely lists one of the unofficial rules of the internet dealing with crossovers (specifically, [[VideoGame/{{Touhou}} rule ⑨]]
** There's also ''Fanfic/AHero'', a crossover with ''Anime/PuellaMagiMadokaMagica'' which subverts most ''Series/DoctorWho'' crossover formulas by instead inserting [[ScaryDogmaticAliens Dalek]] [[MadScientist Sec]] to fix the mess.
** Another crossover that's become increasingly popular is Superwho, which combines ''Doctor Who'' with ''Series/{{Supernatural}}''.
*** Add one more show, ''Series/{{Sherlock}}'', to get Superwholock, which has become quite popular on Tumblr.
** All it took was one scene where a pony had a David Tennant-like hairstyle and an hourglass on his quarter. The result is that under crossovers at Website/FanFictionDotNet, ''Doctor Who'' is the most popular thing to cross into the world of ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', beating out Franchise/SonicTheHedgehog.
** ''Fanfic/ChildrenOfTime'' crosses Ten's era with Literature/SherlockHolmes '''and''' ''WesternAnimation/SherlockHolmesInTheTwentySecondCentury''. Holmes and Watson take Martha Jones' place in Season 3 as Companions, with just a handful of episodes staying close to the original. The Eleventh Doctor is planned to make an appearance eventually...
* ''Literature/TheDresdenFiles'' has a lot of crossovers, including a rare crossover with ''Series/{{Buffy|The Vampire Slayer}} that ''doesn't'' involve its "Halloween" episode. [[https://www.fanfiction.net/s/6600971/1/Higher-Stakes-A-Fanfiction-of-the-Dresden-Files Higher Stakes: A Fanfiction of the Dresden Files]] is complete. It contains spoilers for ''Changes'' and the ''[[ComicBook/BuffyTheVampireSlayer Buffy Season 8]]'' comics, replaces everything after ''Changes,'' and after the ''Buffy'' comics arc "Time of Your Life".
* ''FanFic/DungeonKeeperAmi'' is an improbable mix of ''VideoGame/DungeonKeeper'' and ''Anime/SailorMoon''. And quite [[{{Understatement}} good.]]
* ''FanFic/EventHorizonStormOfMagic'' started off as a crossover between Literature/ASongOfIceAndFire, Literature/TheLordOfTheRings, and TabletopGame/WarhammerFantasy by placing all three worlds on planets near to each other. Then the writer decided to add in a spacefaring MegaCorp from [[TwentyMinutesIntoTheFuture 22nd century Earth]] that's more or less an {{Expy}} of [[Franchise/{{Alien}} Weyland Yutani]].
* [[http://www.fanfiction.net/u/1263379/gabriel_blessing Gabriel Blessing]] is well known for his two ''VisualNovel/FateStayNight'' crossovers:
** ''Fanfic/TheHillOfSwords'', a ''LightNovel/TheFamiliarOfZero'' crossover wherein Louise summons Shirou as her familiar. This FanFic revived the whole concept of "Let's have Louise summon a different person than Saito !"
** ''Fanfic/InFlight'', a ''Manga/{{Sekirei}}'' crossover where Shirou discovers his NotQuiteDead mother, Takami Sahashi, and replaces Minato as the Ashikabi of the North.
* [[https://archiveofourown.org/works/14487714 Game of Mass Destruction]] crosses over multiple fandoms and has The Joker as president.
* The {{Series/Glee}} fanfic ''FanFic/HuntingTheUnicorn'' becomes a three-way crossover with {{Series/Firefly}} and ''Series/CriminalMinds''. [[spoiler: After Blaine and Kurt get rescued from Blaine's stalker,]] Blaine is taken to the Blue Sun hospital for his concussion, where Simon Tam treats him. He later calls the BAU when Blaine's distressed but incoherent rambling gives Simon the suspicion that [[spoiler: the stalker sexually assaulted Blaine.]]
* ''[[Fanfic/GodsAngelsAndKings Hail to the King]]'' is a crossover between {{Franchise/Godzilla}} and {{Anime/Neon Genesis Evangelion}}, using a amalgamated continuity for the former that also incorporates {{Series/Zone Fighter}}. The rewrite replaces Zone Fighter with Franchise/{{Ultraman}}
* Fanfic wise, it's almost impossible to find a fandom that ''doesn't'' have a crossover with ''Literature/HarryPotter. ''
** There are crossovers of ''WesternAnimation/TheLandBeforeTime'' with ''Franchise/StarWars'', ''[[Literature/InheritanceCycle Eragon]]'', ''VideoGame/MegaMan,'' and, in one case, ''VideoGame/{{Halo}}.'' [[http://www.fanfiction.net/s/3007925/1/Star_Wars_The_Land_Before_Time_A_Jedis_Destiny Amazingly, many find that the Star Wars/Land Before time crossover in question is actually good.]]
*** [[http://www.fanfiction.net/s/4307557/1/Harry_Potter_and_the_Land_Before_Time Found the cross between Harry Potter and The Land Before Time!]]
*** "Voldemort has found a way to go back [[ArtisticLicensePaleontology thousands of years]], to the time of the great dinosaurs"? That's not a promising opening line. There's even a [[http://www.fanfiction.net/s/5426174/1/ Land Before Time megacrossover series on FanFiction.net.]] Too bad [[SturgeonsLaw it's about the same as 90% of all fanfics.]]
** There is a really good one between ''Literature/HarryPotter'' and ''VideoGame/FinalFantasyVIII'' that starts when Harry, age 5, is magically transported to the world of [[VideoGame/FinalFantasyVIII FF8]] and once there he becomes a fine Gunblade fighter and is somehow able to use [[VideoGame/FinalFantasyVIII FF8]] magic and do everything one can in the game... without using Guardian Forces. He later has to go back to his own world, where an evil Dumbledore lays in waiting... See [[http://www.fanfiction.net/s/3471134/1/ here for the prequel+ Philosopher's Stone]] arc, [[http://www.fanfiction.net/s/3531911/1/ here for the Chamber of Secrets]] arc and [[http://www.fanfiction.net/s/3580477/1/ here for the Prisoner of Azkaban]] arc. It's a pity that the third arc is not finished...
** There's a small collection of ComicStrip/CalvinAndHobbes[=/=]Literature/HarryPotter crossovers, all involving Calvin being a wizard. Luckily this corner of fan fiction seems to be untouched by SturgeonsLaw, although that may be because they're so small in number. [[http://www.fanfiction.net/Harry_Potter_and_Calvin_Hobbes_Crossovers/224/266/ Give em a look.]] [[http://www.fanfiction.net/s/6548722/1/Calvin_and_Hobbes_in_the_Wizarding_World This one is particularly good so far.]]
** Harry Potter in ''Film/ThePrincessBride''. Hermione dreams the people she knows into the plot of the movie, with herself in the role of the Grandson being read the book by Dumbledore. [[http://www.fanfiction.net/s/135041/1/Harry_Potter_and_the_Florinese_Dream No, really!]]
** One involved the plot of ''Pretty Little Liars'' being re-imagined in the Potter universe. Unlike most other crossovers, the characters of both series don't actually meet. [[http://www.fanfiction.net/s/6701410/1/Pretty_Little_Witches Here it is]]
** Since both Harry and Edward Elric are looking for the PhilosophersStone at some point, there's a lot of crossover fanfiction with ''Manga/FullmetalAlchemist''.
** ''Snakeskins'' is, without a doubt, one of the best fanfics in the whole crossover with ''Webcomic/AxisPowersHetalia'' fandom, in which the two universes are blended amazingly and England and Italy are still their immortal Nation-tan selves while they're at Hogwarts. It... sounds kinda confusing, but it's a lot simpler in context.
** ''FanFic/HarryPotterBecomesACommunist'' does some crossovers with other ''Harry Potter'' fanfics. This consists of, to date, brief appearances by the Professor Quirrell from ''FanFic/HarryPotterAndTheMethodsOfRationality'', Ebony Dark'ness Dementia Raven Way from ''FanFic/MyImmortal'', and Rhysenn Malfoy from ''Fanfic/TheDracoTrilogy''.
* Franchise/{{Highlander}}. You can dump Duncan or Connor or any of the other Immortals in almost any historical period; or assume, for a series set today that this or that character is Immortal; or for series set in the future, assume that someone from a 20th/21st C. series was a Highlander and hadn't lost his/her head before then. Of all the methods that ''Series/LawAndOrderUK'' fanfic writers used to revive the murdered DS Matt Devlin, revealing that he was an Immortal--as well as technically crossing over with ''another'' series by revealing that he was also Archie Kennedy--might have been the most creative.
* In the ''Fanfic/SkyholdAcademyYearbook'' series, ''I Must Be Going'' manages to be both this trope ''and'' SelfInsertFic. It's a crossover from the reader's point of view, being a merging of ''VideoGame/DragonAgeInquisition'' and ''Film/ThePrincessBride''. However, it's a StoryWithinAStory, written and narrated by Varric Tethras; and to the people listening to him read it, it's a SelfInsertFic because ''they're'' the ones in it.
* ''FanFic/TheInfiniteLoops'' structure allows for almost any crossover and, in the background, is technically a MegaCrossover.
* ''Fanfic/TheInstituteSaga'' was initially a Franchise/{{Superman}}/WesternAnimation/XMenEvolution crossover... then it crossed over with series such like ''WesternAnimation/{{Gargoyles}}'' and even other fanfics like ''Fanfic/MakeAWish''.
* In ''[[http://www.fanfiction.net/s/8514012/2/Keena-the-Defendants-of-Constan-Magic-Academy Keena & the Defendants of Constan Magic Academy]]'', starting in chapter 8, the group go to an AlternateUniverse that features characters from the anime film Loups=Garous.
* ''Fanfic/KyonBigDamnHero'' manages to become a crossover between LightNovel/HaruhiSuzumiya and ''Wiki/TvTropes'', with ''VisualNovel/HigurashiWhenTheyCry'' and bits of [[spoiler:''VideoGame/HalfLife'']] added in as well.
* ''Fanfic/LastChildOfKrypton'': Between ''Anime/NeonGenesisEvangelion'' and Franchise/TheDCU (the rewrite focusing exclusively on the Franchise/{{Superman}} side of the universe). Shinji was genetically modified with Kryptonian DNA when he was still a fetus, and became Superman when he grew up.
* Two ''Series/LawAndOrderUK'' fanfics:
** One that crosses over with ''Series/{{Highlander}}'' and ''Series/HoratioHornblower'' has Matt Devlin recovering from the bullet wounds he sustained and explaining to a stunned Alesha and Ronnie that he's immortal and is really Archie Kennedy of the latter series (also probably lampshading [[Creator/JamieBamber Jamie Bamber's]] ChronicallyKilledActor status).
** Another sent Matt and Ronnie to Washington, DC to work with the ''Series/{{NCIS}}'' team. Rather [[HilariousInHindsight amusing]] considering that a) Creator/JamieBamber eventually began a recurring role on the show, and b) thehe team actually did work with UsefulNotes/BritishCoppers at one point.
* ''FanFic/LightAndDarkDEUXTheNewAdventuresOfDarkSoichiro'' is a FanSequel to ''FanFic/LightAndDarkTheAdventuresOfDarkYagami'', which crosses over with other [[TrollFic Troll Fics]], with the description advertising the presence of [[Fanfic/CodeGeassAwesomeOfTheRebellion Awesome de Britannia]], and [[Fanfic/MyImmortal Enoby]].
* ''Fanfic/TheLoneTraveler'': The eponymous Traveler, Harry Potter from a [[FanFic/HarryPotterAndTheNightmaresOfFuturesPast Nightmares of Futures Past]]-type universe, moves through the multiverse, ''Series/QuantumLeap'' style.
* 4 crossovers with ''WesternAnimation/LooneyTunes'' and ''WesternAnimation/WinxClub'' have been done by [[http://www.fanfiction.net/~looneywriter looneywriter]] and [[http://www.fanfiction.net/~kidswbyungsta kidswbyungsta]]. Sure enough, keeping in with the Looney Tunes style of humor, as well as adding characters from ''WesternAnimation/{{Animaniacs}}'', ''WesternAnimation/TinyToonAdventures'', and ''WesternAnimation/PinkyAndTheBrain'' may have helped them grow to be loved by many on Website/FanFictionDotNet.
* One of the most prevalent type of ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' fan fics and fan works in general. The most regular kinds are those such as ''FanFic/BetterLivingThroughScienceAndPonies'' (''VideoGame/{{Portal}}'') and ''WebAnimation/TurnaboutStorm'' (''VisualNovel/AceAttorney''), where another series' characters are transported to Equestria, sometimes [[FisherKingdom turning into ponies in the process]], and {{Fusion Fic}}s such as ''Fanfic/FalloutEquestria'' ([[VideoGame/{{Fallout}} guess]]) and ''Fanfic/FriendsOfASolarEmpire'' (''VideoGame/SinsOfASolarEmpire'').
** Another example is ''Fanfic/TheLittlePonyLegend'', crossing over Friendship is Magic with WesternAnimation/TheLegendOfKorra. It's also something of a self-insert fic, as the ponies are "inserted" into Korra's plot and vice versa over the course of the seven fics present.
* Originally, the intent was for ''Fanfic/MyBravePonyStarfleetMagic''; to be completely separate from ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', but eventually it became a crossover, and then was fully integrated into a ''Franchise/MyLittlePony'' story.
* There's a fanfic series by [[https://www.fanfiction.net/u/4205892/GamesMaster64 GamesMaster64]] called "The Legend of Hyrule Hearts" (shortened to [="LoHH"=] by the author), which crosses over [[Franchise/TheLegendOfZelda The Legend of Zelda]] and [[Franchise/KingdomHearts Kingdom Hearts]]... for the first story anyway... WordOfGod states that the series will cross over into multi-crossover territory in later parts. The second part [[spoiler: will establish pairings. Link is said to be paired with Sia, the titular princess of VideoGame/LadySia and Sora will be paired with Sheba from VideoGame/GoldenSun]]. How that will work out remains to be seen...
** WordOfGod still hasn't mentioned ''how'' the characters will travel to the other worlds, but perhaps that'd get into spoiler territory.
*** WordOfGod states there's also 20 parts planned, with about five specials. This guy's in it for the long haul. The series appears to be dead, but the author blames it on writer's block and real-life being busy.
* It's easier to count the things that Naruto hasn't had crossovers with when it's had crossovers with ''ComicStrip/TheBoondocks'', ''VideoGame/DukeNukem'', ''WesternAnimation/AquaTeenHungerForce'', ''Film/MeanGirls'', ''Godzilla'', ''Franchise/FridayThe13th'' and probably the strangest with ''Series/MarriedWithChildren''.
* ''Fanfic/TheMountainAndTheWolf'': ''Series/GameOfThrones'' meets ''TabletopGame/WarhammerFantasy''. More specifically, the Mountain's duel with Oberyn Martell happens against someone very different, very large, and very keen about certain bloodthirsty gods...
* {{Fanfic/Myrmridon}} by Ser Serendipity has Team 8 from ''Manga/{{Naruto}}'' take on a mission in ''Manga/HunterXHunter''[=’s=] NGL.
* [[http://www.fanfiction.net/s/7897742/1/Platinum-Angel This fic]], a crossover of ''Manga/{{Chobits}}'' with, of all things, ''Franchise/AssassinsCreed'' (trope page [[FanFic/PlatinumAngel here]]). Word from the author is that the eventual sequel will add ''Manga/MidoriDays'' to the mix as well.
* ''[[FanFic/TheLongRoad2015 The Long Road]]'' is an AlternateTimeline crossover story of the WesternAnimation/RiseOfTheGuardians and WesternAnimation/HowToTrainYourDragon canons, not to be confused with a Dragon Ball Z fanfic [[Fanfic/TheLongRoad of the same name]].
* Fanfic/OfLovebugsAndPromises] is an Avengers {{Kid Fic}} set in the Series/{{White Collar}} universe with Phil Coulson being an agent of (a different state's branch of) the FBI's White Collar Unit.
* This is basically the whole point of FanFic/TheOmniverseEvent. Currently, the fandoms include ComicStrip/CalvinAndHobbes, Franchise/BerniceSummerfield, Franchise/YuGiOh, and Series/StarTrekVoyager, with the promise of a lot more on the way.
* ''[[https://archiveofourown.org/works/16749352/chapters/39293203 Only Void Remains]]'' is a crossover of ''Manga/BungoStrayDogs'' and ''Anime/PuellaMagiMadokaMagica'' and follows the plot of the Light Novel ''Dazai Osamu and the Dark Era'' roughly. Uncommonly for the genre, it is an amalgamation of the two universes (the characters from Bungo Stray Dogs follow the laws of the Madoka Magica universe) and the characters of the franchises don't meet eachother. The endnote implies that it is part of a larger crossover universe.
* Decent [[http://www.fanfiction.net/Pokemon_and_Digimon_Crossovers/80/257/ Pokemon/Digimon crossovers]] are not that common in fanfiction, but of late some interesting new submissions have popped up. SturgeonsLaw may be applicable due to grammar issues, but those with decent grammar tend to be alright.
* ''[[http://www.fanfiction.net/s/7843635/1/Portalborn Portalborn]]'' is actually inspired by the [[VideoGame/{{Portal2}} Portal 2 Mod]] for [[VideoGame/TheElderScrollsVSkyrim Skyrim.]] In starts off using the original elements of Fall of the Space Core after pitting [[{{Tsundere}} The]] [[BloodKnight Dragonborn]] with the weird and cooky [[CrazySurvivalist Doug Rattmann]]. It gets crazy, then evolves with a mysterious and adventurous plot.
* ''FanFic/QuinnInWonderland:'' [[Series/{{Glee}} Quinn Fabray]] falls DownTheRabbitHole and ends up in [[Literature/AliceInWonderland Wonderland]]
* The ''Manga/RanmaOneHalf'' fandom loves to create crossovers. There exists several archives devoted to them. Particularly common are crossovers with ''Franchise/SailorMoon'' which has a sub genre called the FukuFic that has more fan fics written for it than most anime has fan fics total.
* Raquaza Master's [[http://s1.zetaboards.com/PokeTown_2/index/ Pokemon Squad]] fanfics are supposed to combine the characters from Franchise/{{Pokemon}}, ''WesternAnimation/KaBlam!'', ''Series/BarneyAndFriends'' (Barney is going to be one of the main antagonists), ''WesternAnimation/DannyPhantom'', ''WesternAnimation/{{Animaniacs}}'', ''Series/SesameStreet'' (Elmo's going to be an upcoming villain), many video games, and much, much more.
* The fancomic ''Webcomic/{{Roommates}}'' by [[http://asherhyder.deviantart.com/ Ashe Rhyder]] and its spinoff ''Webcomic/GirlsNextDoor'' by [[http://pika-la-cynique.deviantart.com/ Pika la Cynique]] are this -- a crossover between ''Film/{{Labyrinth}}'', ''Theatre/ThePhantomOfTheOpera'', ''Franchise/PiratesOfTheCaribbean'', ''Literature/LesMiserables'', and occasionally ''Literature/HarryPotter'' -- the many fandoms that appeared only once or twice are too numerous to count. Both by now run rather independently of each other, with a frequent ContinuityNod and ShoutOut to each other during their many, many storylines. And they are also awesome.
* If you [[AlternateUniverseFic relocate]] ''WesternAnimation/ChipNDaleRescueRangers'' from TheEighties to TheSeventies, you can cross it over with ''Series/{{Kojak}}''. ''Fanfic/TheRodSquad'' does so briefly.
* Creator/RoseOfPollux writes these occasionally.
* The ''Fanfic/RoyalHeights'' combines three animated shows and places them into a sci-fi/fantasy school setting. But not in the way one would expect.
* [[RulesOfTheInternet Rule ⑨]]: If it exists, there is a crossover with ''VideoGame/{{Touhou}}''. [[FanficRecs/TouhouCrossover The series even has its own article.]]
* Due to their popularity, it's very easy to find on [=deviantArt=] crossovers involving ''LetsPlay/TheRunawayGuys'', mostly by [=ThatOneNPC=]. The guys have crossed over with such works as ''Film/TheWizardOfOz'', ''Literature/AliceInWonderland'', ''VideoGame/{{Portal2}}'', ''VideoGame/{{Slender}}'', ''VideoGame/ProfessorLaytonVSAceAttorney'' and ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' ([[http://fav.me/d4vqwcn no really]]), to name a few.
** Each of the guys themselves has been subject to individual crossover fanart. For instance, [[http://fav.me/d4wius7 here]] is fanart crossing over LetsPlay/{{Chuggaaconroy}} with VideoGame/ProfessorLayton. (Chugga liked it, by the way.)
* ''Fanfic/SayItThrice'' is a blending of ''WesternAnimation/DannyPhantom'' and the film ''Film/{{Beetlejuice}}.'' Two years post-movie, Lydia is forced by circumstance to move to Amity Park to live with her mother's sister, and befriends Danny, Sam, and Tucker.
* [[http://www.fanfiction.net/community/Seanzilla115-s-Multi-crossover-stadium/86737/3/0/1/ Seanzilla115's Multi crossover stadium]], This Fanfiction community contains some of the greatest crossover stories by the greatist authors Fanfiction.Net has to offer.
* ''FanFic/ShinjiAndWarhammer40K'' is sort of an odd example. It is not a story where the universes meet, being more of a ForWantOfANail story about Shinji getting a large amount of TabletopGame/{{Warhammer 40000}} pieces and rulebooks as a child. His different (happier) childhood makes for a more dynamic protagonist and leads him to influence the rest of the cast into making things that fit the 40K ethos more than the original Evangelion series did. It's not the straightest example of a universe to universe CrossOver.
* ''Fanfic/SOE2LoneHeirOfKrypton'': Between Franchise/{{Superman}} and ''Anime/NeonGenesisEvangelion''. Asuka knew she had been conceived by sperm donor. What she did not knew was her biological father was an alien from another planet, and his DNA confered vast powers on her. Shortly after finding out about it, she becomes ''Comicbook/PowerGirl'' and later ''Comicbook/{{Supergirl}}''.
* ''FanFic/ThousandShinji'': Between ''Anime/NeonGenesisEvangelion'' and ''TabletopGame/{{Warhammer 40000}}''. A Sorcerer of Thousand Sons Legion fumbles a spell and travels back in time, finding a young Shinji Ikari and raising him.
* ''Fanfic/TheVampireOfSteel'' is a cross between ''Series/BuffyTheVampireSlayer'' and ''ComicBook/{{Supergirl}}'', set in a [[Franchise/TheDCU DC Universe]] where Sunnydale exists.
* Is there anyone Franchise/SonicTheHedgehog hasn't met yet? The blue hedgehog has had crossovers with [[http://www.fanfiction.net/Sonic_the_Hedgehog_and_Percy_Jackson_and_the_Olympians_Crossovers/253/2622/ Percy Jackson]], [[http://www.fanfiction.net/Sonic_the_Hedgehog_and_Godzilla_Crossovers/253/448/ Godzilla]], [[http://www.fanfiction.net/Transformers_Beast_Wars_and_Sonic_the_Hedgehog_Crossovers/65/253/ Transformers]], [[http://www.fanfiction.net/Sonic_the_Hedgehog_and_Halo_Crossovers/253/1342/ Halo]], [[http://www.fanfiction.net/Sonic_the_Hedgehog_and_iCarly_Crossovers/253/2898/ iCarly]], [[http://www.fanfiction.net/Sonic_the_Hedgehog_and_Gorillaz_Crossovers/253/2340/ Gorillaz]], [[http://www.fanfiction.net/Mighty_Ducks_and_Sonic_the_Hedgehog_Crossovers/243/253/ the Mighty Ducks]], [[FanFic/FuckTheJesusBeam Tengen Toppa Gurren Lagann]], [[https://www.fanfiction.net/Sonic-the-Hedgehog-and-Strawberry-Shortcake-series-Crossovers/253/4511/ Strawberry Shortcake]] and [[https://www.fanfiction.net/Sonic-the-Hedgehog-and-Tinkerbell-Crossovers/253/3713/ Tinkerbell]]. Are any of these even remotely connected?
** But [[http://www.fanfiction.net/Sonic_the_Hedgehog_and_Mario_Crossovers/253/347/ we all know who the big winner is...]]
** [[http://www.fanfiction.net/s/7891955/1/Sonic-Generations-Friendship-is-Timeless This]] fanfiction crosses over ''Franchise/SonicTheHedgehog'' with the cast of ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', in a reimagining of the plot of ''VideoGame/SonicGenerations''. It goes far beyond what the original game gives, showing the author did their research. For instance, Ponyville serves as the central [[NoPunIntended hub]], similar to the White Void in the game, the Death Egg Robot battle in the original is replaced with Nightmare Moon and in this fanfiction, Tails fights Metal Sonic instead of Sonic, possibly a reference to ''VideoGame/SonicTheHedgehog4''. The author has even adapted the updated canon of Friendship is Magic into the fanfic. However, how the author intends to implement alicorn Twilight is currently unknown.
** ''VideoGame/SonicManiaAndHatsuneMiku'': A ''very'' well-done GameMod of ''VideoGame/SonicMania'' that replaces the titular character with [[Music/{{Vocaloid}} Hatsune Miku]] wearing a Sonic parka, [[{{Understatement}} amongst a few other things]].
* It's crazy just how many crossovers on Website/FanFictionDotNet exist between ''Franchise/SonicTheHedgehog'' and ''Franchise/SuperMarioBros''. Sure, [[VideoGame/MarioAndSonicAtTheOlympicGames this may have become canon]] but authors were doing it way before then.
* Franchise/SpiderMan has a slew of crossovers on Website/FanFictionDotNet. [[http://www.fanfiction.net/s/5011834/1/Web_of_Shadow_Fallout This one]] crossed with the TeenageMutantNinjaTurtles, and [[http://www.fanfiction.net/s/3914495/1/A_Hospital_In_Jersey this one]] crossed with ''Series/{{House}}'' are quite good.
* ''StarWars'' and ''Franchise/StarTrek''. The rivalry between their fanbases and The UltimateShowdownOfUltimateDestiny makes it a bygone conclusion feature some, and for those to require at least one major battle between the United Federation of Planets and the Galactic Empire, but there are certain exceptions.
** Another good one is [[http://sfdebris.com/unity.asp Unity]] by notable contributor WebSite/SFDebris. What is a wormhole was connected from the Delta Quadrant circa Voyager's fifth season to the Star Wars Universe circa early Return of The Jedi, (disrupting the Rebel Alliance's attempt to attack the second Death Star.) Involved every character from TNG forward moving well into the future and exploring all the potential interactions in detail.
** To complete the trifecta of renowned Star Wars vs. Star Trek fanfics, there's [[http://bbs.stardestroyer.net/viewtopic.php?t=404&highlight= StarCrossed]].
* ''FanFic/{{Super Miyuki World}}'':VideoGame/{{Super Mario World}} with [[Manga/{{Lucky Star}} Miyuki Takara]] as the protagonist, anyone?
* ''FanFic/{{Survivability}}'': The ''Manga/{{Bleach}}'' universe with an original plot, starring characters from different KPop groups (Music/DongBangShinKi, Music/SHINee, Big Bang, Music/SuperJunior, Music/B2ST, +other solo singers and actors).
* [[http://www.fanfiction.net/s/6095074/1/Takamachi_Nanoha_of_2814 Takamachi Nanoha of 2814]] is a ''Anime/MagicalGirlLyricalNanoha'' Crossover with ''Comicbook/GreenLantern''. Then, it started to cross over with ''everything'' by chapter 3. Written by the almost infamous Shadow Crystal Mage, so you know it's good. [[FanFic/TakamachiNanohaOf2814 Now with its own page.]]
* ''Fanfic/TangledAdventuresInArendelle'': Going on their honeymoon, the main cast of Disney/{{Tangled}} goes to visit [[Disney/{{Frozen}} Arendelle]] for a month..[[OhCrap just at Queen Elsa's coronation]].
* ''[[http://www.fanfiction.net/s/7941617/1/To_Kill_A_Thief To Kill A Thief]]'' is ''Manga/KamikazeKaitouJeanne'' [[JustForFun/XMeetsY meets]] ''Manga/DeathNote''.
* ''[[{{Fanfic/TokimekiPokeLiveAndTwinbee}} Tokimeki PokéLive! and Twinbee]]'' is a lighthearted Seinen style crossover between ''{{Franchise/Pokemon}}'', ''Franchise/LoveLive'', ''VisualNovel/TokimekiMemorial'' and ''VideoGame/TwinBee'' that focuses on female characters from the ''Pokémon'' games, ''VideoGame/LoveLiveSchoolIdolFestival'', ''Love Live! Perfect Dream Project'', ''Tokimeki Memorial:Forever with You'' and ''Twinbee'' with female characters from other franchises making cameo appearances in various main stories. And there's also a Shonen style (Although still pretty lighthearted) spin off called ''Tokimeki PokéLive! and Twinbee Side Stories'' that have male Pokémon characters making appearances depending on the story arc and in addition, focuses more on characters who don't appear in the main stories at all or who don't appear that often in the main stories.
* At least 300 crossovers of ''WesternAnimation/TotalDrama'' are available on fanfiction.net
** [[http://www.fanfiction.net/~supertrip One writer]] has written the aptly named "Total Crossover" series. They are currently working on ''3'' installments at the same time. [[spoiler: The scenes with [[WesternAnimation/TheAdventuresOfJimmyNeutronBoyGenius Jimmy Neutron]] border on RevengeFic.]]
* This [[http://www.fanfiction.net/s/7878969/1/The-Transformers-Marvel-Continuty fanfic]] is a shared universe for the Transformers and Marvel characters. as of 2013 an standalone Marvel and an official crossover story are yet to be written, but there plans to do so
* ''Fanfic/ToInfinity'' is a ''Toys/{{Bionicle}}'' and ''Franchise/{{Halo}}'' cross-over.
* ''Fanfic/TranspositionF'' is a crossover between ''WebAnimation/{{RWBY}}'' and ''Anime/DragonBallZ''.
* Likewise, you will be able to find crossovers between ''Literature/{{Twilight}}'' and just about anything
** Not many Crossover fics have managed to be as awesome as ''[[http://www.fanfiction.net/s/4821971/1/Edward_meets_Sherlock_Holmes Sherlock Holmes vs Edward Cullen]]''.
* ''Fanfic/WeissReacts'' is primarily in the ''WebAnimation/RWBY'' universe, but shares a universe with ''Manga/{{Chobits}}'', ''[[Franchise/ShinMegamiTenseiPersona Persona]]'', the ''Franchise/{{Nasuverse}}'', ''Manga/FruitsBasket'', ''Manga/AiYoriAoshi'' and ''Anime/AKB0048'', with elements from ''Anime/CodeGeass'', ''Franchise/FireEmblem'', ''Anime/GuiltyCrown'' and ''VideoGame/LeagueOfLegends'', of all things.
* When ''Fanfic/WithStringsAttached'' was first conceived, it was supposed to be a [[Music/TheBeatles Beatles]]/''TabletopGame/DungeonsAndDragons'' crossover. Luckily, the author quickly matured out of that notion, and the story turned into something far more interesting and complex, though its {{RPG}} roots are quite evident still.
* The longtime crossover champion for TV shows is ''The Witness'' by Michele Martin, which managed to cross ''Series/ForeverKnight'', ''Series/{{Highlander}}'', ''Series/TheXFiles'', ''Series/QuantumLeap'', and the ''Series/{{Starman}}'' TV series. Believe it or not, the fic manages to keep all those balls in the air successfully, and even bring in cameos from a few other series, all while following a coherent plot and keeping the characters in-character!
* ''Fanfic/{{Wonderful}}'' is a crossover between ''Literature/{{Worm}}'' and ''VideoGame/TheWonderful101'' where "Worm" main character Taylor gains a different power set and becomes the hero Wonder Red.
* Literature/TheWTFJournal crosses over at least five fandoms.
* ''WebAnimation/ZanyToTheMax'' has an episode where the Warners (it's an ''WesternAnimation/{{Animaniacs}}'' fan series) enter the world of ''Literature/TheTimeMachine'' and try to help the Time Traveler find Weena as part of a contest. If they win, they will be able to [[ImTakingHerHomeWithMe take Weena home with them]]. [[spoiler: They don't win. WebAnimation/{{Homest|arRunner}}ripe [[AuthorAvatar Runner]] does instead.]] The episode is implied to turn into a MassiveMultiplayerCrossover by the end.
-->'''News Reporter''': We just got reports of [[WesternAnimation/ThePowerpuffGirls three super-powered sisters from the city of Townsville, Animenia]], in the Warner Bros. studio.\\
'''Yakko''': Super-powered sisters? Townsville, Animenia? [[BorrowedCatchPhrase Yes!]] Come, Warners. We must prepare for tomorrow.\\
'''Wakko''': Why, Yakko? What are we going to do tomorrow?\\
'''Yakko''': [[WesternAnimation/PinkyAndTheBrain The same thing we do every day, Wakko]]. Unfortunately, I have no idea what that is.\\
'''WesternAnimation/PinkyAndTheBrain''': They're zany, and they're the Warners, eight, eight, eight, eight, eight.
** There is a crossover episode in every season.
*** In fact, Season 3 consists of ''[[UpToEleven entirely]]'' crossover episodes!
* An author on [=FFnet=] has created [[http://www.fanfiction.net/s/2322545/1/Halo_Republic_Commando a crossover]] between ''Franchise/StarWars'' and ''Franchise/{{Halo}}'' where the characters of ''VideoGame/StarWarsRepublicCommando'' (and some friends and enemies) meet Master Chief and company in the ''Halo'' universe. There is a sequel that takes place mostly in the ''Star Wars'' universe during the events of the Original Trilogy.
* Another author has crossed over ''WesternAnimation/MegasXLR'' with [[http://www.fanfiction.net/s/7777108/1/The_Golem_of_New_Jersey Harry Potter]], [[http://www.fanfiction.net/s/7734042/1/Megas_Five0 Lilo & Stitch]] and [[http://www.fanfiction.net/s/7929483/1/Perry_XLP Phineas & Ferb]], crossed over Phineas & Ferb with [[http://www.fanfiction.net/s/7712752/1/Seasonal_Sentai_Summerranger Super Sentai]] and [[http://www.fanfiction.net/s/7858523/1/The_Platypus_Rider Kamen Rider]], and then combined all the previous into a [[http://www.fanfiction.net/s/7998417/1/Megas_Final_Wars Mega Crossover]]
* These [[https://www.youtube.com/watch?v=O2sUOlf-DVs two]] [[https://www.youtube.com/watch?v=0SRUCfgSj_0 videos]] make a sort of crossover between ''Manga/LuckyStar'' and ''LightNovel/HaruhiSuzumiya''.
* In Anime fanfiction (and sometimes in other media), a quite common way to establish a plot, especially in PeggySue fics, is to have a wish be granted by [[Manga/AhMyGoddess Belldandy or her sisters]]. Whether this crossover is minor or major varies between fics.
* One author has even crossed over (at various times) Transformers with [[http://www.transformersfanfic.com/viewstory.php?sid=2439&chapter=1 Knight Rider]], The [[http://www.transformersfanfic.com/viewstory.php?sid=865&chapter=1 Real Ghostbusters]], Franchise/MastersOfTheUniverse, [[http://www.transformersfanfic.com/viewstory.php?sid=873&chapter=1 Sailor]] [[http://www.transformersfanfic.com/viewstory.php?sid=866&chapter=1 Moon]], [[http://shebakoby.deviantart.com/art/Jewel-Of-4-Sparks-32879715 Inuyasha]], and [[http://www.transformersfanfic.com/viewstory.php?sid=5021&chapter=1 Judge Judy]].
* There are a lot of fanarts involving [[Disney/TheJungleBook Kaa]] the Snake hypnotizing various victims. Google search "Kaa" and you'll see what the deal is.
* While not a FanFic, [[https://www.youtube.com/user/LogoAttitude this Youtube user]] makes videos which present "what if" situations dealing with [[VanityPlate television logos]], which also includes gems like [[https://www.youtube.com/watch?v=r6r3yR0PzCE "What if Steven Bochco collaborated with 4K!ds Entertainment?"]].
* [[https://www.fanfiction.net/s/3510991/1/One-Piece-A-Smash-Adventure One Piece: A Smash Adventure]] by [[https://www.fanfiction.net/u/794512/Specter24 Spectre24]] has Manga/OnePiece characters crossover with various Nintendo franchises related to VideoGame/SuperSmashBros
** Due to it's increased popularity, other users have attempted to make similar crossovers based off this. Most notable is [[https://www.fanfiction.net/u/447022/Game2002 Game2002]] who basically took the same concept, this time with Touhou characters. His [[https://www.fanfiction.net/s/5681268/1/Touhou-Journey-to-the-Smashing-Beyond crossover]] was also a huge hit among fans.
* FanFic/MegamiNoHanabira is a crossover between the unrelentingly dark Franchise/ShinMegamiTensei and the SugarWiki/{{WAFF}}-y GirlsLove {{Eroge}} Sono Hanabira Ni Kuchizuke Wo.
* FanFic/MutantStorm is a Franchise/HarryPotter[=/=]Franchise/XMen crossover where Jean Grey is Lily Potter's twin sister, and she decides to take Harry into her family after the events in Literature/HarryPotterAndTheOrderOfThePhoenix
* This song combines ''Anime/{{Pokemon}}'' and ''Anime/{{Digimon}}'' to the tune of ''Disney/{{Mulan}}''.
* Creator/HansVonHozel:
--> "One day, Manga/{{Naruto}} was sit on a beach.
-->It was many suns in the sky.
-->Suddenly, [[Franchise/DragonBall Vegeta]]!"
** ''World of Danube: A ''Film/MammaMia[=/=]''Literature/HarryPotter'' crossover''.
* ''Fanfic/SuperheroRPF'' is mainly a Comicbook/{{Ms Marvel|2014}} / Comicbook/LokiAgentOfAsgard crossover (had some cameos from other Marvel titles like the Comicbook/YoungAvengers).
* ''Fanfic/{{Ultrasonic}}'' is a crossover between ''WesternAnimation/MiraculousLadybug'' and ''Disney/{{Zootopia}}'', with Marinette being somehow transported to Zootopia with only Tikki for company, and her nemesis following her there a year later.
* ''FanFic/WaitingInSin'' is a crossover between ''Anime/{{Bleach}}'' and ''Literature/HarryPotter'' where Ulquiorra Schiffer is reborn as Harry Potter after his death.
* ''FanFic/WaterAreobicsForTheAquaphobic'' centers on most of Hogwarts' student body (and a couple of Death Eaters) being cursed into various forms after Umbridge brings them on a poorly-thought out field trip to Jusenkyo from ''Manga/RanmaOneHalf''. [[VideoGame/TombRaider Lara Croft]] is also mentioned in passing as giving no end of trouble to the Gringotts employees in Egypt.
* ''Fanfic/WhenTheDoctorWentToDownton'' is, as the title suggests, [[Series/DoctorWho the Doctor]] going to [[Series/DowntonAbbey Downton]].
* ''FanFic/{{Worldfall}}'' is a crossover between Literature/{{Worldwar}} and Literature/{{Footfall}} set on an Earth that its {{Twenty Minutes into the Future}}.
* ''[[http://archiveofourown.org/works/10027490 Operation Epic Beer Run]]'' and ''[[http://archiveofourown.org/works/10027490 And Miles To Go Before I Sleep]]'' cross ''Film/TheMartian'' with the Franchise/MarvelCinematicUniverse via [[spoiler: Dr. Beck being one of Bucky Barnes's descendants]].
* ''FanFic/ThreeSpecialSteps'' is a crossover between ''WesternAnimation/Incredibles2'' and ''Disney/MeetTheRobinsons''.
* ''FanFic/BlackBeastOfTenguCity'' is a crossover between ''VideoGame/BlazBlue'' and ''LightNovel/DateALive''.
* In ''Fanfic/AmazingFantasy'', Izuku turns down [[ForWantOfANail turns down an alleyway]] instead of walking under a bridge and gets bitten by a genetically-altered (and possibly radioactive) spider, giving him the powers of Franchise/SpiderMan. A few weeks later, a [[OlderAndWiser 47-year-old]] Peter Parker drops into Izuku's universe after a brawl with Mysterio.
* ''Fanfic/WanderOverFostersAUOneshot'' Crossover between two cartoons ''WesternAnimation/WanderOverYonder'' and ''WesternAnimation/FostersHomeForImaginaryFriends''.
* ''Fanfic/TheSupermen'' is a crossover between ''Franchise/ResidentEvil'' (the game canon, not the films) and ''Franchise/JusticeLeagueOfAmerica'' (comics canon, although it appears to be a mix of pre- and post-New 52). It involves Wesker ending up in the DC universe [[NotQuiteDead after the events of]] ''VideoGame/ResidentEvil5''.
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