Crossover / Other Media

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Advertising

• One commercial for Strawberry Froot Loops has Toucan Sam taking refuge in a cave and having a run-in with Snap, Crackle and Pop (the Rice/Cocoa Krispies mascots) and Tony the Tiger (of Frosted Flakes fame).
• GEICO featured a crossover with the Pillsbury Doughboy.

• Procter and Gamble had their spokespeople and mascots unite in a Superbowl commercial.
• Taco Bell did one with several lesser stores, such as a car dealership chain called the Auto Connection, for a series of Super Bowl ads for their new queselupa.
• Quite a few car commercials incorporate clips from whatever blockbuster movie happens to be out at the time.

Asian Animation

• The 2011 spring animation festival for CCTV Dream has popular characters from Chinese animation watch and interact various animated shorts from different studios.
• Flower Angel: Hatsune Miku, of all people, is an integral character in Season 1 episodes 33 and 34. She travels through space-time and gets sent to the human world, where she is turned into a fairy and is attracted to the sound of a boy playing the piano.
• Lamput: "Lamput Meets Tuzki" is about Lamput meeting Tuzki, a Chinese character featured in emoticons, when they show up during a field trip to the lab.

Comic Strips

• An annual issue of Dragon saw the cartoonists of the magazine's main comics (Phil Foglio of What's New? with Phil and Dixie, John Kovalic of Dork Tower, and Aaron Williams of Nodwick) switch strips with each other for the issue, resulting in these. Foglio took over Dork Tower (which saw a disguised Dixie toy with Igor and apparently make Carson into stew off-panel), Williams took over What's New? (which saw his characters try and fail to review 3rd edition Dungeons & Dragons while Phil and Dixie watch), and Kovalic took over Nodwick (which saw Igor play the titular character in a game and quickly take things Off the Rails).

Mythology

• Due to the popularity of Arthurian legends, many unrelated Welsh and Breton folk tales later had some Arthurian elements and trappings added, such as with Tristan and Iseult.
• Older Than Feudalism: The Classical tale of Jason and the Argonauts brought together many mythological heroes in a sort of Justice League Ancient Greece. "Hero" in Classical Mythology was an awfully vague term (as Larry Gonick put it, heroes aren't necessarily heroic, just excessive), and since the mission was to steal an item (the Golden Fleece) "Justice League" isn't a terribly good name for them....
• Maid Marian, the shepherdess, featured in many pastoral plays popular at May festivities. Then there was a fad for Robin Hood plays. Then someone put the two characters together. It worked so well that Maid Marian is best known as a Robin Hood character, even though her independent existence predates him.

Radio

• Batman and Robin made frequent appearances on The Adventures of Superman.
• The Archers had a crossover with Gardener's Question Time for Easter 2011, where the real-life panel, chaired by the real-life Eric Robson answered questions from the population of Ambridge.
• On the April 1, 2013, broadcast of "Family Life Today", John Fuller and Jim Daly, from "Focus on the Family", crossed over.
• Two episodes of The Goon Show featured guest appearances by Jack Train as Colonel Chinstrap from ITMA, a popular comedy show from the previous decade. There was also a crossover with the comedy "Educating Archie", called "Archie in Goonland".
• An arguable one, similar to the Comic Relief Panel Game crossovers above, the New Year 2010 episode of The BBC Radio 4 comedy panel game The Unbelievable Truth featured Stephen Fry, Alan Davies, regular QI panelist Rob Brydon and QI producer John Lloyd. The format of the game was unchanged, but the "obvious answer" klaxon was added. Much to the satisfaction of the other players (and host David Mitchell), Stephen set it off twice.
• The BBC Radio 4 drama Afterplay is an Anton Chekhov crossover in which Sonya Serebryakova from Uncle Vanya meets Andrei Prozorov from Three Sisters, a couple of decades after the events of the plays.

Tabletop Games

• "Reality Storm: When Worlds Collide" crossed over Hero Games' Champions and Guardians Of Order's Silver Age Sentinels, co-produced by both companies. The adventure itself was dual-statted, but the book also included official conversion notes between the Tri-Stat d10 system and 5th edition Hero System.
• One of the alternative rules for Die Laughing allows for two monster sheets to be used at once, with the showdown set up over the first two acts, and the actual monster fight occurring in the third.
• Dungeons & Dragons did this with the second edition meta-settings Planescape and Spelljammer connect individual settings' worlds into one Multiverse. So the characters of Forgotten Realms, Greyhawk and Dragonlance can take a ride and visit each other. Planar travel reaches isolated places such as Dark Sun and Ravenloft. The latter hardly is a desirable destination, so it has The Mists that can appear in normal worlds and abduct the PCs to the Demiplane of Dread.
  • The Spelljammer novels of The Cloakmaster Cycle demonstrated such a campaign, with most of the first book taking place on Krynn, only gradually introducing the concept of spelljamming to the hero. Later he visited two of less known locations on Toril. At least Forgotten Realms actively supported the meeting with other worlds by dropping mentions in its own sources.
  • D&D also did a crossover with Magic: The Gathering in the form of the Plane Shift series of free Campaign Settings which gave detailed descriptions of various planes from the Magic universe with D&D-rules. Later, the Guildmasters' Guide to Ravnica took this premise up to eleven by making a whole Campaign Setting Book for D&D that takes place on the plane of Ravnica from Magic.
• West End Games' Paranoia had a trilogy of crossovers under the banner "Vulture Warriors of Dimension X". The first two adventures crossed over with Cyberpunk 2013 and Twilight: 2000, while the third adventure used time- and dimension-travel as a campaign hook for open-ended crossovers with other franchises.

• Warhammer 40,000 and Warhammer were originally much the same (the former being the latter Recycled In Space), but drifted apart with further editions with only Chaos and the Warp linking them together. Nevertheless, they are occasionally hinted to be in the same universe, with futuristic items and artifacts finding their way into the Chaos Wastes, and Kaldor Draigo making an appearance as well.

Theatre

• Don Juan und Faust (1829) by Christian Dietrich Grabbe, a German dramatist. It is a crossover of the myth of Faust and of the tale of Don Juan.
• Stephen Soundheim's Into the Woods features Cinderella, Rapunzel and Jack and the Beanstalk, with cameos by Sleeping Beauty and Snow White.

Theme Parks

• Godzilla vs. Evangelion: The Real 4-D at Universal Studios Japan is Exactly What It Says on the Tin: Godzilla against the cast of Neon Genesis Evangelion—more specifically, the Godzilla of Shin Godzilla vs. (given Asuka being identified as "Shikinami", not "Soryu", and the designs of the EVAs) the cast of Rebuild of Evangelion.

Toys

• LEGO has many licensed sets of Star Wars, Harry Potter, superheroes, etc. Easy crossover potentials, as demonstrated with The LEGO Movie. Especially with LEGO's own original sets like Ninjago and Legends of Chima.
• Mr. Potato Head has outfits from many other franchises. Transformers is a given, since Hasbro owns both, but the Heads can also dress up as characters from Star Wars, DC, and Marvel.
• Simlarly, Transformers has its fair share of crossovers. Not only in the comic book realm (most infamously being a part of the greater Marvel universe during the initial miniseries, resulting in appearances from Nick Fury and Symbiote suit Spider-Man; and the crossthrough with Mars Attacks! during the IDW years. Japan even having their own crossover with Mazinger Z), in video games like SMITE or Splatoon or for Paramount+, but in the toylines as well. Ranging from the short-lived tabletop line Atacktix, which promoted itself on its ability to pit characters from both the Transformers and Star Wars universes against each other. To full-blown spin-off lines with other Hasbro-owned properties and licences, with the most recent incarnation being Transformers Collaborative. Which on top of releasing figures from the IDW Publishing crossovers and one on the Blackbird, also adds in Top Gun and Jurassic Park into the mix. The Japanese side of the toyline even features crossovers with both Disney and Neon Genesis Evangelion.
• Tamagotchi:
  • It's had crossovers most prominently with Aikatsu! and Sanrio. The Tamagotchi P's has several add-on that feature Aikatsu and Sanrio characters, while Aikatsu's Datacardass game features a Tamagotchi stage; and there's an entire m!x version dedicated to Sanrio characters.
  • The 1997 Mothra Tamagotchi, released as a tie-in to Rebirth of Mothra 2, allows the player to raise various kaiju such as Mothra and Godzilla.
  • There's also the toy Doraemontchi and the functionally-equivalent Doramitchi.
  • The Tamagotchi Nano model, introduced in 2010, has been reused for numerous crossovers since. These include Tokyo Disney Easter mascots Usatama and Usapiyo, Gudetama, Eevee, Pac-Man, and Neon Genesis Evangelion.
• You can very much do this with any action figures you own.

Visual Novels

• In Majikoi! Love Me Seriously!, members of the Kuonji household shows up in several places, as they live in the neighbouring area. In one of the routes they even spend the night in that mansion. Naturally, one of them mentions that Yukie has a nice voice.
• Despite being an internally consistent multiverse, the Nasuverse only has crossovers in incredibly round-about ways. Part of the problem is, well, Word of God stated that some of the characters simply cannot exist in the same universe for Canon reasons.
  • Zelretch was seen in the Prologue to Tsukihime with a young Arcueid. He also appears for one scene in the "Heaven's Feel" route to Fate/stay night, walking in from Another Dimension to meet Rin.
  • Aoko Aozaki spends time in the beginning of Tsukihime with a young Shiki Tohno, appears later in Melty Blood, and is the main character of Witch on the Holy Night. Her sister, Tohko Aozaki, is the Older and Wiser mentor figure of the (arguably) Tsukihime-prototype, The Garden of Sinners, plays a major role in Mahoyo, and is mentioned in an ending of Fate/stay night. Despite each of them knowing a different Shiki (each possessing the Mystic Eyes of Death Perception) it's explicitly stated that Tohko and Arcueid cannot exist in the same universe (and most likely, Shiki Ryougi and Shiki Tohno can't, either).
  • Shirou's employer at his part-time job in Fate/stay night (who appears once in an easily-missed scene) shares a name with a drug dealer in The Garden of Sinners.
  • Cornelius Alba of The Garden of Sinners makes a cameo appearance in the Fate/Zero anime adaptation, though he doesn't appear in the original light novels.
  • Sion's magic gun in Melty Blood is a replica of Godo's Black Barrel in Angel Notes, which Ciel is reportedly carrying around in Tsukihime.

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