History Main / FanonWelding

* ''WesternAnimation/TheMagicSchoolBus'': Because Mrs. Frizzle is sometimes implied to be ReallySevenHundredYearsOld and her bus can change shape, some people have wondered if she's a Time Lord from ''Series/DoctorWho''. This is debunked in an episode with a FantasticVoyagePlot, in which it's revealed that she has one heart (Time Lords have two). Then again some ExpandedUniverse material has stated that Time Lords only have a single heart prior to their first regeneration.

* Much like the ''Psych''/''Leverage'' example below, some fans of ''Series/{{CSINY}}'' and ''Film/ForrestGump'' posited that Det. Mac Taylor is the nephew of Lt. Dan, due to their shared last name, military backgrounds, and [[Creator/GarySinise remarkable resemblance]].

* ''WesternAnimation/TheMagicSchoolBus'': Because Mrs. Frizzle is sometimes implied to be ReallySevenHundredYearsOld and her bus can change shape, some people have wondered if she's a Time Lord from ''Series/DoctorWho''. This is debunked in an episode with a FantasticVoyagePlot, in which it's revealed that she has one heart (Time Lords have two).

* A popular theory -- proposed by science fiction writer John D. Clark in 1956 (making this trope OlderThanCableTV) and promoted by various other professional writers and scholars such as William Stuart Baring-Gould -- suggested that Literature/NeroWolfe is the son of Literature/SherlockHolmes, generally the product of an affair with Irene Adler. As discussed [[https://en.wikipedia.org/wiki/Auguste_Lupa#:~:text=Lupa%2C%20a%20secret%20agent%20during,aliases%20used%20by%20the%20character on this Wikipedia page,]] the novelist John Lescroat created a character called Auguste Lupa, who is implied to be Wolfe himself pulling a ThisIsMyNameOnForeign, and who is explicitly Holmes son.

* ''Fanfic/ThePixarTheory'', a fan theory (or group of theories) that postulate that all Pixar movies are part of a shared universe, using the different EasterEggs as proof of that. Of course, the details of such connection will depend on who you ask,as the theory already has several notable exponents like the credited creator of the theory himself, Jon Negroni, the Super Carlin Brothers, and countless fan theories on Reddit and other forums from many others. In case you're wondering, [[WordOfGod Pixar creators]] have already debunked it to varying degrees. Pete Doctor (''WesternAnimation/MonstersInc'', ''WesternAnimation/{{Up}}'', ''WesternAnimation/InsideOut'') dismissed it, but admitted that all ''his'' films could potentially work within a single universe. Meanwhile, Brad Bird (''WesternAnimation/TheIncredibles1'', ''WesternAnimation/{{Ratatouille}}'') is explicit about all his films (not counting sequels) taking place in different universes, much less all of them being within a larger Pixar-verse. Additionally, WordOfGod regarding the Toy Box world in ''VideoGame/KingdomHeartsIII'' indicates that the universe of the ''Toy Story'' films is canonically one of the worlds in the multiverse of ''Franchise/KingdomHearts'' (as opposed to a BroadStrokes alternate retelling like most Disney worlds in the series). One could reasonably interpolate that if the same is true regarding the Monstropolis world, then at least those Pixar movies operate on the ''Kingdom Hearts'' Multiverse Theory. This was eventually [[https://screencrush.com/how-toy-story-4-debunks-pixar-theory-interview-mark-nielsen/ discussed]] and [[{{Jossed}} debunked]] by the producers of ''WesternAnimation/ToyStory4''.

** Capcom tends to give fans reason to believe various titles are connected even outside of the ''[[VideoGame/CapcomVs Vs.]]'' series. Examples include (but are not limited to) the logo for ''Franchise/ResidentEvil''[='s=] Umbrella Corporation appearing on crates in sister SurvivalHorror series ''VideoGame/DinoCrisis''; the setting of the first ''Dino Crisis'', the Borginian Republic, being mentioned in ''Franchise/AceAttorney'' (another series Creator/ShuTakumi had a hand in creating); Hewie from ''VideoGame/HauntingGround'' showing up in ''VideoGame/ResidentEvil4'' as the dog caught in a bear trap that Leon can save; and the [[VideoGame/ResidentEvil5 Tricell]] logo popping up on billboards in the 2009 ''VideoGame/BionicCommando''. Unlike ''Franchise/StreetFighter'', which is explicitly or implicitly linked to [[VideoGame/FinalFight quite]] [[VideoGame/SaturdayNightSlamMasters a]] [[VideoGame/CaptainCommando few]] [[VideoGame/RivalSchools other]] [[VideoGame/{{Strider}} titles]] (and, [[AlternateUniverse possibly]], [[VideoGame/AsurasWrath at least]] [[VideoGame/StreetFighterXTekken one or]] [[VideoGame/Tekken7 two more]]), these were probably nothing more than {{Easter Egg}}s... which didn't stop the WildMassGuessing.

* ''WesternAnimation/Primal2019'' is sometimes speculated to take place in the same universe as ''WesternAnimation/SamuraiJack'', due to the shows (again) sharing [[Creator/GenndyTartakovsky a creator]] and the presence of dark magical elements in both shows. Specifically, it's a common suggestion that Aku is behind the rage-inducing potion in "Rage of the Ape-Men", the eponymous zombie plague in "Plague of Madness" and the witches' magic in "Coven of the Damned" (with the leader of the coven supposedly being a daughter of Aku). Spear, the caveman hero of ''Primal'' also shares some physical resemblance to Samurai Jack and is speculated to be his ancestor.
** Speaking of the potion, it also turns users' skin purple, indicating it may be the source of [[WesternAnimation/DextersLaboratory Crunk]]'s powers.

** Due to sharing a theme of criticising late-stage capitalism by showing exactly how would colonization of space under guide of mega corporations look like, most of fans of ''VideoGame/HardspaceShipbreaker'' seems to agree the game takes place in the same universe as ''The Outer Worlds''. Sometimes this is expanded to also include one of multiple other games where topic of corporations (mis)handling colonization of space is present, such as ''VideoGame/CitizenSleeper'', ''VideoGame/RedFaction'', ''VideoGame/{{Subnautica}}'', ''VideoGame/SystemShock'' and ''VideoGame/{{Tacoma}}''. It may even reach outside of video games, usually pulling in ''Literature/TheMurderbotDiaries''.

*** In ''VideoGame/TatsunokoVsCapcom'', [[VideoGame/{{Darkstalkers}} Morrigan]] has a win quote against VideoGame/ViewtifulJoe whereupon she expresses disappointment in him after hearing about the hero from [[TheRival Alastor]]. Couple this with ''Viewtiful Joe''[='s=] own assertations about ''Devil May Cry'' lore (like Alastor being the spirit of Dante's Devil Arm of the same name from ''[[VideoGame/DevilMayCry1 DMC1]]''), Dante appearing in Jedah's ''VideoGame/CapcomFightingEvolution'' ending, and the aforementioned ''Marvel vs. Capcom 3'' showing Dante and Joe to be familiar with one another (presumably because of Dante's [[GuestFighter inclusion]] in the [[UsefulNotes/PlayStationPortable PSP]] version of ''Red Hot Rumble''), and you have plenty of fans speculating that ''Darkstalkers'', ''Devil May Cry'', and ''Viewtiful Joe'' share continuity.

** Due to sharing a theme of criticising late-stage capitalism by showing exactly how would colonization of space under guide of mega corporations look like, most of fans of ''VideoGame/HardspaceShipbreaker'' seems to agree the game takes place in the same universe as ''The Outer Worlds''. Sometimes this is expanded to also include one of multiple other games where topic of corporations (mis)handling colonization of space is present, such as ''VideoGame/RedFaction'', ''VideoGame/{{Subnautica}}'', ''VideoGame/SystemShock'' and ''VideoGame/{{Tacoma}}''. It may even reach outside of video games, usually pulling in ''Literature/TheMurderbotDiaries''.

* ''WebOriginal/ThePixarTheory'', a fan theory (or group of theories) that postulate that all Pixar movies are part of a shared universe, using the different EasterEggs as proof of that. Of course, the details of such connection will depend on who you ask,as the theory already has several notable exponents like the credited creator of the theory himself, Jon Negroni, the Super Carlin Brothers, and countless fan theories on Reddit and other forums from many others. In case you're wondering, [[WordOfGod Pixar creators]] have already debunked it to varying degrees. Pete Doctor (''WesternAnimation/MonstersInc'', ''WesternAnimation/{{Up}}'', ''WesternAnimation/InsideOut'') dismissed it, but admitted that all ''his'' films could potentially work within a single universe. Meanwhile, Brad Bird (''WesternAnimation/TheIncredibles1'', ''WesternAnimation/{{Ratatouille}}'') is explicit about all his films (not counting sequels) taking place in different universes, much less all of them being within a larger Pixar-verse. Additionally, WordOfGod regarding the Toy Box world in ''VideoGame/KingdomHeartsIII'' indicates that the universe of the ''Toy Story'' films is canonically one of the worlds in the multiverse of ''Franchise/KingdomHearts'' (as opposed to a BroadStrokes alternate retelling like most Disney worlds in the series). One could reasonably interpolate that if the same is true regarding the Monstropolis world, then at least those Pixar movies operate on the ''Kingdom Hearts'' Multiverse Theory. This was eventually [[https://screencrush.com/how-toy-story-4-debunks-pixar-theory-interview-mark-nielsen/ discussed]] and [[{{Jossed}} debunked]] by the producers of ''WesternAnimation/ToyStory4''.

** Due to sharing a theme of criticising late-stage capitalism by showing exactly how would colonization of space under guide of mega corporations look like, most of fans of ''VideoGame/HardspaceShipbreaker'' seems to agree the game takes place in the same universe as ''The Outer Worlds''.

* Franchise/DisneyAnimatedCanon:

* ''WebOriginal/ThePixarTheory'', a fan theory (or group of theories) that postulate that all Pixar movies are part of a shared universe, using the different EasterEggs as proof of that. Of course, the details of such connection will depend on who you ask,as the theory already has several notable exponents like the credited creator of the theory himself, Jon Negroni, the Super Carlin Brothers, and countless fan theories on Reddit and other forums from many others. In case you're wondering, [[WordOfGod Pixar creators]] have already debunked it to varying degrees. Pete Doctor (''WesternAnimation/MonstersInc'', ''WesternAnimation/{{Up}}'', ''WesternAnimation/InsideOut'') dismissed it, but admitted that all ''his'' films could potentially work within a single universe. Meanwhile, Brad Bird (''Franchise/TheIncredibles'', ''WesternAnimation/{{Ratatouille}}'') is explicit about all his films (not counting sequels) taking place in different universes, much less all of them being within a larger Pixar-verse. Additionally, WordOfGod regarding the Toy Box world in ''VideoGame/KingdomHeartsIII'' indicates that the universe of the ''Toy Story'' films is canonically one of the worlds in the multiverse of ''Franchise/KingdomHearts'' (as opposed to a BroadStrokes alternate retelling like most Disney worlds in the series). One could reasonably interpolate that if the same is true regarding the Monstropolis world, then at least those Pixar movies operate on the ''Kingdom Hearts'' Multiverse Theory. This was eventually [[https://screencrush.com/how-toy-story-4-debunks-pixar-theory-interview-mark-nielsen/ discussed]] and [[{{Jossed}} debunked]] by the producers of ''WesternAnimation/ToyStory4''.

* A lot of Franchise/IndianaJones fans consider ''Film/GungaDin'' a direct prequel to ''Film/IndianaJonesAndTheTempleOfDoom'' due to the similarities between the two films, and the fact that the Thugee are the villains in both films.
* There is a fan theory that suggests ''Film/Life2017'' is a [[StealthSequel Stealth Prequel]] to ''Film/Venom2018'', speculating that Calvin -- the alien life form that the crew come across -- is actually a Symbiote from the Franchise/MarvelUniverse because of its similar design and ability to absorb its prey. This was partially fueled by the fact that the former movie recycles a minor shot from ''Film/SpiderMan3'', which was Venom's debut in live-action.

* Franchise/MarvelCinematicUniverse:

* ''Franchise/{{Batman}}: Creature of the Night'' is a miniseries about a man who starts to see an apparition looking like his favorite comicbook hero, Batman, which can interact with real world and reacts to his subconcious desires, with horrifying results. Many fans of ''Franchise/JoJosBizarreAdventure'' like to say it is stealthily set in world of the manga and the "Batman" is actually a highly independent Stand.

* After a review called ''VideoGame/PizzaTower'' "''VideoGame/{{Celeste}}'' for weirdos", the two fanbases became FriendlyFandoms over how odd a comparison they found this (they're both {{Platform Game}}s, and that's about as far as the similarities go), leading to loads of crossover fanart and a popular headcanon that Peppino is Madeline's uncle.

Compare CommonCrossover, where the works in question are featured notably often in crossover fics, but aren't necessarily considered to be unoficially canonical to one another. Also compare with the DoppelgangerCrossover, a trope where multiple characters sharing common features, voices, and/or actors are either brought together or revealed to be the same universe somehow.

** There's a bit more to this one. ''Outer Worlds'' lore references a catastrophic [[WorldWarIII "Great War"]] in the mid-21st century. Meanwhile, ''Fallout'' lore puts that exact same event in the year 2077. The two colony ships, ''Groundbreaker'' and ''Hope'', also both depart Earth in the 23rd century, putting the launch close to the events of ''VideoGame/Fallout2'', ''[[VideoGame/Fallout3 3]]'', and ''[[VideoGame/FalloutNewVegas New Vegas]]''. ''Hope'' is even explicitly said to have launched in 2285, the year that ''New Vegas'' takes place.

[[folder:Multiple Media]]

* ''WebOriginal/ThePixarTheory'', a fan theory (or group of theories) that postulate that all Pixar movies are part of a shared universe, using the different EasterEggs as proof of that. Of course, the details of such connection will depend on who you ask,as the theory already has several notable exponents like the credited creator of the theory himself, Jon Negroni, the Super Carlin Brothers, and countless fan theories on Reddit and other forums from many others. In case you're wondering, [[WordOfGod Pixar creators]] have already debunked it to varying degrees. Pete Doctor (''WesternAnimation/MonstersInc'', ''WesternAnimation/{{Up}}'', ''WesternAnimation/InsideOut'') dismissed it, but admitted that all ''his'' films could potentially work within a single universe. Meanwhile, Brad Bird (''WesternAnimation/TheIncredibles'', ''WesternAnimation/{{Ratatouille}}'') is explicit about all his films (not counting sequels) taking place in different universes, much less all of them being within a larger Pixar-verse. Additionally, WordOfGod regarding the Toy Box world in ''VideoGame/KingdomHeartsIII'' indicates that the universe of the ''Toy Story'' films is canonically one of the worlds in the multiverse of ''Franchise/KingdomHearts'' (as opposed to a BroadStrokes alternate retelling like most Disney worlds in the series). One could reasonably interpolate that if the same is true regarding the Monstropolis world, then at least those Pixar movies operate on the ''Kingdom Hearts'' Multiverse Theory. This was eventually [[https://screencrush.com/how-toy-story-4-debunks-pixar-theory-interview-mark-nielsen/ discussed]] and [[{{Jossed}} debunked]] by the producers of ''WesternAnimation/ToyStory4''.

* Due to ''Film/EventHorizon's'' story fitting, both plotwise and atmosphere, the tone of ''TabletopGame/Warhammer40000'', many fans considered the film as a prequel when humanity makes its first contact with [[HyperspaceIsAScaryPlace the Warp and its dark powers]].

* There is a fan theory that suggests ''Film/Life2017'' is a StealthPrequel to ''Film/Venom2018'', speculating that Calvin -- the alien life form that the crew come across -- is actually a Symbiote from the Franchise/MarvelUniverse because of its similar design and ability to absorb its prey. This was partially fueled by the fact that the former movie recycles a minor shot from ''Film/SpiderMan3'', which was Venom's debut in live action.

* ''Literature/TheSalmonOfDoubt'', the fragmentary third ''Literature/DirkGently'' novel, has an unnamed ginger-haired actor in a minor role. Since ''Literature/TheHitchhikersGuideToTheGalaxy'' describes Ford Prefect's hair as "wiry and gingerish", his cover story on Earth was an out-of-work actor, and Creator/DouglasAdams was talking vaguely about rewriting the whole thing as the sixth ''Hitchhiker's'' book before he died, it's a popular assumption that this is him.
* "Blackbury" was Sir Creator/TerryPratchett's go-to name for [[EverytownAmerica Everytown, UK]], but it's certainly not impossible that the ''Literature/NomesTrilogy'' and the ''Literature/JohnnyMaxwellTrilogy'' take place in the ''same'' Blackbury, especially as they both feature the Neil Armstrong Shopping Centre. Adding every mention of Blackbury in the ''Buck's Free Press'' children's page is doable, but a bit more of a stretch, since you end up with a Blackbury in which ''so much'' weird stuff has happened that Johnny's status as the town WeirdnessMagnet is under threat.

* There's a rather popular fan theory that Booth in ''Series/{{Bones}}'' is the reward or shanshu of ''Series/{{Angel}}''. They like to point out how similar Booth and Angel are and it's well known that the Buffyverse has countless different dimensions. Since the shanshu was translated as become human and live until he dies, these fans like to think Angel was given Booth's life as his reward, only with no memory of his previous life. A few former Buffy alums having appeared in ''Bones'' just adds to it.

** ''Series/HenryDanger'' and ''Series/{{Victorious}}'' are both in the Series/NickVerse, so a common theory is that Frankini from the former series is Cat Valentine's [[TheGhost frequently-mentioned but never-seen brother]] from the latter series. This is because Goomer from ''Series/SamAndCat'' appears as Frankini's henchman in his debut episode and mentions that he used to hang out with Frankini's sister. Frankie is also played by Frankie Grande, the brother of Cat's actress Music/ArianaGrande. Frankini's hammy supervillainy also lines up with the strange, psychotic personality Cat describes her brother to have. It's never confirmed if Frankini's sister ''is'' Cat, but the implications seem to line up.

* After a review called ''VideoGame/PizzaTower'' "''VideoGame/{{Celeste}}'' for weirdos", the two fanbases became FriendlyFandoms over how odd a comparison they found this (they're both {{Platform Game}}s, and that's about as far as the similarities go), leading to loads of crossover fanart and a popular headcanon that Peppino is Madeline's uncle.

* Almost immediately after ''VideoGame/TriangleStrategy'' was announced, fans jumped on the idea that it takes place in the same world as ''VideoGame/OctopathTraveler'', just on a different continent, due to their very similar art styles. The idea became even more popular after its release because both games use the term "Aelfric" and ''VideoGame/TriangleStrategy'''s setting is extremely isolated, meaning it could easily be one of the unexplored lands that are occasionally mentioned in ''VideoGame/OctopathTraveler''. ''VideoGame/VariousDaylife'' also quickly found itself included in this fanon-setting, again due to the use of the term "Aelfric".

* Due to shared focus on ultraviolence, taking place in an AlternateHistory version of the Cold War era, big involvement of Russian mafia in the plot and similiar soundtrack, many fans believe ''VideoGame/MotherRussiaBleeds'' takes place in ''VideoGame/HotlineMiami'' universe.

** Another series with which ''Gravity Falls'' is commonly portrayed as being in the same universe is ''WesternAnimation/TheOwlHouse'', partially due to the ProductionPosse involved with both shows, but also because of the CrossoverShip of Stan/Eda gaining popularity. Stan's known to have gotten married in Las Vegas to a woman who sounds very similar to Eda, leading many fans to speculate that it ''was'' Eda, albeit using a fake name. The creators haven't denied it when asked, meaning this might be the one Vegas crossover theory with canonical support. An episode in the second season even confirms that Eda has used the alias "Marilyn," which is known to be the name of Stan's ex. It's hard not to believe the creators weren't [[FandomNod giving the proponents of this theory a wink]] there.