Intercontinuity Crossover

From rivals of the Console Wars to rivals on the Olympic playing field.

A crossover between two works that are not within the same Canon or Continuity.

Having a Crossover between two related shows is one thing — it's not inconceivable that some of the Cheers cast should turn up in Frasier, is it? Or that characters from JAG could turn up on NCIS. Or that the CSI team might help out the guys in CSI: NY every now and again.

What happens when Jay and Silent Bob turn up in Scream 3? Or Cliff and Norm from Cheers book into St. Elsewhere for medical attention? Or a police officer from the grittily realistic Homicide: Life on the Street arrests Fox Mulder of The X-Files? Or the CSI team finds a corpse in a hotel that isn't a corpse, just Angel? Well, then you've got yourself a different kettle of fish altogether. And to add insult to injury, the fish are probably from Finding Nemo and The Little Mermaid.

There are a few reasons why this happens. Sometimes it's because both series are owned by the same network or company, and it wants to improve the ratings on the one show by having the cast from the more popular show appear in it. Sometimes it's because both shows share writers or producers and they think it would be amusing to link the two. And sometimes it's just because someone somewhere thought it would be cool.

Most crossovers of this kind are between properties that are owned by the same company or person, which makes legal wrangling easier. But sometimes characters will cross over into another company's properties, like the occasional events from rival comic book firms DC Comics and Marvel Comics.

It makes quite a difference whether the crossover reveals that the characters have supposedly been sharing the same world the whole time; or if they're "just" from Another Dimension. While not as big a deal if both series are "relatively" realistic, such as Crime Dramas, if each show has its own version of fantastic events a la Fantasy or Science Fiction; then the implication is that these elements have been existing side by side the whole time, unaware of each other. It also makes for some great Fridge Logic. "Hey, Problem A for Cast B is no big deal, if Cast A and B are friends, why don't they just ask for help?" Of course, Superman Stays Out of Gotham, and Reed Richards Is Useless as always.

For more information and examples, see Thom Holbrook's Crossovers and Spin Offs Master List, which documents all known crossovers between TV series, except for cartoons. With this information, the site has been able to identify no fewer than 38 contiguous TV "universes" (as of March 2008) which are home to widely disparate (and apparently unlikely) combinations of series from different eras and networks. For instance, see Holbrook's "Group 2" — ninety-four series (as of March 2012) ranging from Six Feet Under and Everybody Loves Raymond to Law & Order and The X-Files, taking in M*A*S*H, Cop Rock, and Home Improvement along the way. Thanks to the baroque web of interconnections and crossovers, it is suggested that these shows all inhabit the same universe. (Holbrook also discovered the "Jean-Claude Van Damme is dead" plague that poses a grave threat to any future crossovers including Star Trek and other Group 10 shows.)

It has been noted on this and other sites that the web of crossovers connects many shows, directly or indirectly, to St. Elsewhere. Since that entire series was shown in its final episode to be the fantasy of an autistic mental patient, it has become a Stock Epileptic Tree that all of reality is All Just a Dream of an autistic mental patient. In the words of Dwayne McDuffie, one of the executive producers of Justice League, "The last five minutes of St. Elsewhere is the only television show, ever. Everything else is a daydream."

Some fanfics specialise in lobbing together lots of fandoms together in one big Mega Crossover. (And speaking of fanfics, if you're not sure if a crossover exists for a given pair of fandoms, remember that Rule 50 is in effect - it probably exists somewhere.)

When this trope happens with three or more series instead of two, it's a Massive Multiplayer Crossover. When the two settings are blended so as to be one unified setting that partakes of elements from both, that's a Fusion Fic.

When each others' works of fiction appear in-universe as fiction in a stable fictional loop, that's Mutually Fictional. When a work of fiction itself appears in its own story, that's Recursive Canon.

Compare Crossover, Fake Crossover, Weird Crossover, Public Domain Canon Welding. See also Transplant, Fully Absorbed Finale, Guest Fighter, and Ultimate Showdown of Ultimate Destiny.

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Examples:

Anime and Manga

• Cyborg 009 vs. Devilman is something many people didn't see coming, since Cyborg 009 is a story about cyborg superheroes with very minimal violence, while Devilman is a story about a demonic superhero killing other demons with tons of blood and gore, absolutely nobody thought two opposite series would get such a crossover. Thankfully it works for the most part.
• Part of the Red Ribbon Army story arc on Dragon Ball had Goku chasing Captain Blue to Penguin Village, the setting of Akira Toriyama's earlier manga/anime, Doctor Slump, and featured appearances by Arale, Dr. Norimaki, and several other characters. This appeared in the manga and anime (since both shows were made by Toei and aired on Fuji TV); moreover, when Doctor Slump was animated again in 1997, a new Dragon Ball crossover was written in.
  • Dr. Slump made another crossover appearance in Dragon Ball Super, with a bit of Leaning on the Fourth Wall by Vegeta of all characters, as he notes that his usual fighting style won't work against a Gag Series character like Arale. There was also an earlier cameo by Arale in the episode where, due to suffering from temporary Power Incontinence, Goku couldn't properly control his Instant Transmission, and ended up back in Penguin Village for a few seconds.
  • Toriyama already did that in Dr. Slump itself: there was one chapter where the characters traveled to Wonder Island, the set of the titular manga (and Toriyama's very first published work).
• The Air/Kanon crossover manga (Key/Visual Arts).
• Apparently mostly because the author of Fairy Tail really liked Flunk Punk Rumble they made a crossover called Fairy Megane.
  • That the author of Flunk Punk Rumble's favorite author happens to be the author of Fairy Tail probably helped, as well a former assistant of his. What's most stunning of all is that despite being SERIOUSLY WTF, it actually ain't half bad.
  • Fairy Tail also had a crossover with the story Mashima wrote before it, Rave Master. The Jiggle Butt gang appeared in the anime as well.
• The Fate/stay night X Magical Girl Lyrical Nanoha and Magical Girl Lyrical Nanoha X Fate/kaleid liner PRISMA☆ILLYA collaboration manga that both started in the March 2010 issue of Comp Ace magazine.
• Lupin III
  • Most notable is the crossover with Detective Conan, which was a big enough deal to warrant both a TV special and a theatrical film.
  • Lupin III had a one-shot crossover with Kochikame as part of the latter's Milestone Celebration (which also included crossovers with Dragon Ball Z, Golgo 13, Kinnikuman and more). The Lupin III segment ended with the revelation that Ryotsu, Reiko, Nakagawa and Chief Ohara had all been tied up and replaced by the Lupin gang.
  • 2023 saw the release of a crossover film with fellow heist series Cat's Eye as a Prime Video exclusive.
• Dragon Ball and One Piece in Cross Epoch.
  • At one of the Jump Fiesta events they featured another crossover of Luffy and Goku going up against Eneru above the city of Tokyo. Other characters get short cameo and Ryotsu of Kochikame made an appearance (as seen here). They would later do this again only this time against Arlong and Astro Boy was thrown into the mix.
• Slayers VS Orphen
• Rodimus's backstory in Transformers: Energon states that he left Cybertron with a band of Autobots and "traveled into the future", which reflects the ending of Transformers: ★Headmasters, in which he ventures off into space to find/found a new home planet.
• To promote the Jump Super Stars game for the DS, a manga was included for those who preordered drawn by the people behind Eyeshield 21. A standard "sucked into a world to defeat the villain" affair but damn if it's not cool seeing Naruto, Luffy, Goku, Toujou, and Bobobo work with Seta to kick Dr. Mashrito's butt.
• It's not much, but in Mobile Fighter G Gundam, during the finale episode where all the world's Gundams had banded together to fight the Dark/Devil Gundam, you can see Gundams from other series in the mob. For example, both the standard RX-78-GP01 and the RX-78-GP01Fb Full Vernian, the Wing Gundam, RX-78-2, etc. They weren't kidding when the said they had all the Gundams! In the case of the Wing Gundam, it was an Early-Bird Cameo, as Gundam Wing debuted the week after G Gundam ended.
• In-universe example in Bakuman。: Crow and +Natural are two manga drawn by the same artist, the former about a crow-man (or something like that, the premise is never stated), while the latter is about a kid who finds he's psychic. Fast forward to a time where +Natural is doing poorly while Crow remains among the most popular of Jump, and you get the protagonist of Crow showing up in +Natural, saying he's also a psychic. (We only know so much about the Shows Within A Show, so we can't be sure that they're in different continuities, but given the plots and the characters' reactions, this seems to be the case.)
• There's also the Minky Momo vs. Creamy Mami OVA.
• This has become a trend with Shonen Jump manga, and the anime adapted from them.
  • Gintama and Sket Dance had a crossover chapter for each manga, and two corresponding crossover episodes.
  • Toriko and One Piece had two crossover episodes (one of which was adapted from a manga crossover).
  • Later on, One Piece, Toriko, and Dragon Ball Z had a crossover episode, though it obviously had no bearing on the continuity of any of the anime involved. It does reference their previous crossovers by having Toriko and Luffy recognize each other; however, they have no idea who this Goku character is...
• The plot of Re:CREATORS features the characters of numerous unrelated fictional series appearing in the real world. In order to stop one of the Creations who's gone Omnicidal Maniac, the writers of the works involved are brought together to create a massive crossover event for their characters as a means to empower the heroic Creations and fight against the Big Bad. An issue the creators face in this endeavor is merging multiple, sometimes vastly different worlds into one story and making it something the audiences will accept, which is pivotal to making the plan work.

Card Games

• Legendary Showdown: Machines & Magic is a sequel/expansion to Dr McNinja's Legendary Showdown which is a crossover between Girl Genius and Gunnerkrigg Court. (And, if you play it as an Expansion Pack, The Adventures of Dr. McNinja.)
• Magic: The Gathering released Secret Lair Drop Series: The Walking Dead in 2020. This was later expanded into a full crossover line with unique card frames called "Universes Beyond." It has since gone on to include card from Warhammer 40,000, Stranger Things, The Lord of the Rings, and many more. Wizards of the Coast has also released two expansions set in the Forgotten Realms campaign setting that they own for Dungeons & Dragons, though these don't use the Universes Beyond frame.

Comic Books

• The Doctor showed up in one of the Buffy Season 8 comics for a panel (along with Rose). Suddenly London's forgetfulness makes sense.
• Beginning with Predator vs. Aliens, the two extraterrestrials have done battle (either one-on-one or multiplayer deathmatch) with essentially every superhero ever created, no matter how illogical the match-up. Taken to ridiculous extremes in Superman and Batman vs. Aliens and Predator and Archie vs. Predator (which is actually an interesting read). Perhaps the most famous of these stories was WildCATS/Aliens which actually had an impact on the former's continuity and saw the deaths of several members of Stormwatch to allow Warren Ellis to clear the decks to create The Authority.
• Despite their rivalry, DC Comics and Marvel Comics have had numerous crossovers between their two companies, leading to meetings between Superman and Spider-Man and in particular Batman and Captain America, the two companies' main Badass Normal heroes, and also confrontations between heroes and villains from each, such as Spider-Man taking on The Joker. The whole thing even has a standing Hand Wave established in the late 1990s, that the Marvel and DC universes will occasionally start to merge on their own, leaving teams from the two inhabiting the same continuity all of a sudden and remembering each other as if it's always been that way. For instance, in the X-Men/Teen Titans crossover, at one point they even discuss bringing in the Justice League and Avengers to help.
  • An interesting example: X-Men and Teen Titans◊. Starfire learns languages by kissing people, and Nightcrawler thinks that's terrific.
  • An unfortunate side-effect of this is that the closest Jubilee has ever come to a serious relationship is with a guy who lives in another universe.
  • JLA/Avengers is considered canon (or at least was before the New 52), with the "Syndicate Rules" arc in JLA and the later Trinity maxi-series both acting as sequels of sorts. However, thanks to trademark issues, the Avengers themselves could not be mentioned in either follow-up, even though the incident where they teamed up with the League was vaguely alluded to.
  • John Byrne's Batman/Captain America crossover takes an interesting turn by setting it in The '40s with the Lighter and Softer versions of both characters (though it's more World War II enthusiasm, since both characters also embody Good Is Not Soft in the comic), with an epilogue taking place in the sixties, with some Mythology Gags tossed in. (It's also apparently in continuity with Superman & Batman: Generations, although as above, Cap is never mentioned directly in that book.)
  • Played with in Doomsday Clock when Dr. Manhattan forsees a "Secret Crisis" in 2030 between Superman and "Thor himself... and a green behemoth stronger than even Doomsday, who dies protecting Superman from these invaders."
• Some comics by Roy Thomas saw a team-up between Robert E. Howard's Conan and Michael Moorcock's Elric of Melnibone. For Elric, this makes sense, as his home continuity is explicitly one of many parallel worlds.
• 2000 AD:
  • Judge Dredd has teamed up with Batman on at least three occasions; given Bats' vigilante status and Dredd's fascist asshole status, there was some distinctly Teeth-Clenched Teamwork on both sides. Dredd has taken on Aliens and the Predator as well. And in 2000 AD publications themselves, Dredd has crossed paths with Johnny Alpha from Strontium Dog twice (Both of these strips have been created by the same people) and has seen a whole score of cameos from outside characters during the Helter Skelter story arc.
  • The protagonist of the Fiends of the Eastern Front prequel 1812 is none other than Armand d'Hubert from The Duellists.
• The Power Rangers have been involved in a few crossovers, including one between Power Rangers Turbo and Big Bad Beetle Borgs in The '90s, another between Mighty Morphin' Power Rangers and Justice League in 2017, and one between Mighty Morphin' Power Rangers and Teenage Mutant Ninja Turtles (IDW) in 2019. A crossover between Power Rangers Zeo and Youngblood (Image Comics) was announced in 1996, but went unpublished due to the implosion of the comic book industry that occurred that same year.
• The Punisher:
  • Punisher met Batman in two one-shot comics: Lake of Fire, where he worked with the post-Knightfall version of the character (Jean-Paul Valley, aka Azrael), and Deadly Knights, where he got a less warm welcome from the original one, Bruce Wayne. One highlight of the second crossover is the Joker having an Oh, Crap! moment when he realizes that Frank really will kill him; of course he doesn't because of Joker Immunity but it is still hilarious. The first crossover even got mentioned at the start of KnightsEnd, as Azrael namedrops Jigsaw.
  • Punisher was featured in one of the single most bizarre intercontinuity crossovers, ever: Archie Meets the Punisher. The story ends with a joking tease for a future crossover between Jughead and Wolverine. The Archie EIC at the time admitted the comic came about from him randomly meeting some Marvel guys at a cafe and talking.
• Speaking of Archie, there's DC's Harley & Ivy Meet Betty & Veronica. The plot has Harley Quinn and Poison Ivy kidnapping the two teens after Veronica's dad tries to drain a swamp that lies between Gotham and Riverdale.
• Superman/He-Man◊. It didn't suck as much as you thought it would, chiefly because this was before the cartoon debuted, and He-Man behaved more like the loinclothed barbarian he was, and didn't have Orko laming it up. Now, DC Universe vs. The Masters of the Universe on the other hand... Another crossover, this time with the universe of the Injustice video games, occurred in 2018.
• Speaking of He-Man, DC also did the miniseries He-Man/Thundercats, with Mumm-Ra seeking out He-Man's sword as the only weapon able to stand against the Sword of Omens.
• Just over a decade beforehand, Top Cow and Image Comics joined forces for a pair of Battle of the Planets / ThunderCats (1985) one-shots (one with Battle first, the other with Thundercats first).
• Dark Horse Comics gave us Tarzan versus Predator At The Earth's Core.
• Illyria of the Buffy Verse has appeared in Peter David's Fallen Angel. David also wrote an earlier Illyria one-shot.
• There have been multiple crossovers with the properties of Image, including Spawn/Batman, Youngblood (Image Comics)/X-Force, and even Invincible meeting Spider-Man in an issue of Marvel Team-Up. There was also a two-part Gen-Actives/Mutants story that began with Team 7 and Team X (Wolverine, Sabretooth, Maverick and Wraith) and ended with Gen¹³ and Generation X.
• Top Cow published an extended crossover with Marvel called Devil's Reign, which depicted characters from both universes coming together to stop Mephisto. Conversely, there have been quite a few other Top Cow crossovers that simply acted as though the various characters were part of the same universe, such as Sara Pezzini from Witchblade having met Wolverine and Lara Croft, the cast of Cyberforce having teamed up with the X-Men, and Jackie Estacado from The Darkness having fought Superman, Painkiller Jane and the Hulk. A particular odd duck was the The Darkness/Batman crossover, which featured an important in-continuity event that affected the mainline The Darkness series, even though Jackie will probably never be able to mention the time he met the Dark Knight.
• Captain Atom: Armageddon thrusts the DC Comics hero into Jim Lee's WildStorm universe. The mini-series functions as a Cosmic Retcon for Wildstorm, and allows those comic readers who generally hated the ridiculousness of The Authority watch them get their heads handed to them.
• Prior to this, there had been a Superman/Gen¹³ crossover.
• Mars Attacks! the Image Universe! Savage Dragon actually kept it in-continuity, with an issue that gave a basic overview for those who didn't read it, and continued the story from there with Chicago recovering from the invasion.
• Sonic the Hedgehog (Archie Comics) Super Special #7 crossed over with the entire Image Comics universe, and it's all in continuity. Sonic the Hedgehog/Mega Man: Worlds Collide teamed up the blue heroes for the first time; while it's considered non-canon for Mega Man, it's canon for Sonic as it served as the comic's Cosmic Retcon due to the heaping of Screwed by the Lawyers the comic was being put through. The crossover with Mega Man and Mega Man X, though, revealed that Mega Man's half is canon, just that it's in the future.
  • Not only has Sonic met those groups, he's also encountered Sabrina the Teenage Witch a few times. However, because of how Sonic's treated, all of their encounters are considered non-canon.
• When it was originally planned as a four-issue limited series, Transformers shared the same 616 universe as other Marvel characters. J. Jonah Jameson sent Peter Parker to Oregon to investigate the Transformers (he wanted pictures of Optimus Prime) and thus Spidey and the Autobots teamed up, while Nick Fury and Dum-Dum Dugan had a cameo (in which Nick made a thinly-veiled reference to Marvel's Godzilla, King of the Monsters (1977) series). When the title became a monthly ongoing series, however, the crossover was quietly forgotten (although the Savage Land appeared as late as issue #8, and wasn't ever formally Retconned into another Lost World location). The Transformers letter column even asked fans to please ignore the earlier Marvel crossover stories. However, after it became a regular series, the character Circuit Breaker appeared in Secret Wars II, issue 3, indicating some connection between the series and Marvel continuity.
  • The Neo-Knights, a team of superheroes which included Circuit Breaker, would've gotten their own Marvel Universe series had Simon Furman had his way (he even teased the plans for their series in the letters column of the final issue of The Transformers (Marvel)). The new series would've Retconned the Transformers series as a training simulation for the team to prepare for "real" robot threats.
  • A company crossover between IDW and Marvel did have the New Avengers and Autobots team up. It's considered ambiguously canon by IDW.
  • They also, naturally, had crossovers with their G.I. Joe comic, to the point that in the "Generation 2" series, they all but merged, albeit not without a touch of Continuity Snarl in the process (and they effectively de-merged anyway, as the G2 book proceeded to devastate much of the Earth, something which didn't happen in the G.I. Joe book). Years later, nearly anybody with the license will consider making their own version of the crossover, notably Dreamwave's alternate universe which is set during World War II, and Devil's Due's multiple mini-series, which is actually referenced in the Titanium Series toyline as well as a Subscription Service-exclusive toy. As of Revolution (2016), the current IDW continuity now crosses both franchises over with several other Hasbro-owned properties, two of which (Rom: Spaceknight and Micronauts) were also previously published by Marvel (and integrated into the Marvel Universe at the time).
  • IDW also published a crossover between G.I. Joe and Street Fighter.
  • IDW's Transformers: Regeneration One, a continuation of the original Marvel series, revealed the existence of the Transformers Multiverse to Hot Rod, and in the climactic battle occurring in the final issue has several of Hot Rod's multiversal counterparts show up in Zero Space to help him.
    IDW Rodimus: Anyone without a "Hot" or a "Rod" in their name, give 'em a real hard time.
  • IDW eventually published Transformers/Ghostbusters, a crossover that features a unique take on the Transformers within the IDW Ghostbusters universe.
• The original Mirage Teenage Mutant Ninja Turtles have crossed over with several other indie comic book characters, most notably Miyamoto Usagi, Cerebus, the Wild West C.O.W.-Boys of Moo Mesa, and Savage Dragon. Plus Turtles Forever, crossing over with both initial TMNT cartoons.
  • Usagi Yojimbo's appearance in several episodes of both initial TMNT cartoons. Playmates Toys' TMNT toy line even had an action figure for him at one point.
  • When Archie Comics had the license, a crossover with the Riverdale gang was inevitable.
  • The IDW Turtles cross over with the Ghostbusters and later Batman, in Batman/Teenage Mutant Ninja Turtles, as well as Street Fighter in Teenage Mutant Ninja Turtles vs. Street Fighter.
• The Fantastic Four piloted Combattler V once. This was when Marvel was publishing a Shogun Warriors comic book under license from Mattel, who released several Japanese Humongous Mecha toys under the banner. The Warriors were fully integrated members of the Marvel 616 universe, though now that Marvel has lost the license...
• Hack/Slash has crossed over with several other horror series and characters, including Evil Ernie from Lady Death, Child's Play, Hatchet, BUMP, and Re-Animator. Tim Seeley, the writer, has said in interviews that he considers all slasher films to take place in the same universe of canon (justified by some of the entries in the cinema section of this page).
• The League of Extraordinary Gentlemen series by Alan Moore runs off this principle — that all of fiction exists. So you get Allan Quatermain teaming up with Captain Nemo, Mina Murray, Dr. Jekyll & Mr. Hyde, and Dr. Hawley Griffin. Then you get characters like Mycroft and Sherlock Holmes, Professor Moriarty, James Bond, Edward Prendrick of The Island of Doctor Moreau, the Martians from The War of the Worlds, Alice's Adventures in Wonderland, Mary Poppins, Harry Potter, an unnamed Dr. Fu Manchu, and the litany of late-19th century to mid-20th century fiction showing up. There are books out that detail all of the references Moore crams in there. To put the above in perspective... One of the reference books for the first of the League comics has around three pages detailing one panel of all the things referenced in a museum.
• Marvel Team-Up: Issue #74 teams Spider-Man with The Not Ready For Prime-Time Players to fight Silver Samurai after John Belushi accidentally gets Silver Samurai's ring. In a similar vein, The Avengers once appeared on Late Night With David Letterman, whereas Fantastic Four let the Thing fight an out-of-control robot on the set of The Gong Show (All Part of the Show ensued).
• Image and Valiant Comics came out with Deathmate in the 90s, but the less said about that the better.
• American Born Chinese has a subplot that crosses Journey to the West with Christianity.
• The first Vertigo Comics Winter's Edge special has a House of Secrets framing story where Rain visits an art gallery in the house that shows her stories from The Sandman (1989), The Books of Magic, Hellblazer, The Dreaming, The Minx, Nevada and The Invisibles. While the first four are part of one continuity, the latter three are all individual continuities, as is House of Secrets itself.
• The two House of Mystery Halloween annuals may count, because each features a story from iZombie, which hasn't been confirmed to be part of the main DC/Vertigo continuity, unlike House of Mystery and the other titles that appeared in the annuals (Madame Xanadu, Lucifer, Hellblazer, and The Dreaming).
• One of the first, if not the first intercompany crossover, at least among comic companies was actually... the Justice Society of America. Four characters from All-American Publications^note The Atom, The Flash, Green Lantern and Hawkman and four from National Allied Publications^note Doctor Fate, Hour-Man, The Spectre and The Sandman began appearing together as the Framing Device for All-Star Comics' various stories as members of, well, a society dedicated to justice. Not only that, but Detective Comics, Inc's flagship character, Batman, had a small mention in their first story, before appearing in person a few issues later. The Justice Society's first appearance was in 1940, six years before all three companies merged - though as you can tell, they were already friendly enough to organize something like this.
• Justice League of America:
  • 1997's JLA (1997)/WildCATS by Grant Morrison.
  • 2000's JLA (1997)/Witchblade.
  • 2001's JLA Versus Predator.
  • 2005's JLA/Cyberforce.
  • There was a six issue JLA/The 99 miniseries from 2010.
  • 2019 saw a crossover between the Justice League and Dark Horse's Black Hammer.
• Antarctic Press comics Gold Digger and Ninja High School have had frequent crossovers among their various characters.
• When Marvel reacquired the license to produce Star Trek comics in 1996, one of their first publications was the Star Trek/X-Men one-shot. Naturally, such a crossover couldn't happen without having both Bones and Beast in the same room as somebody asks for "Dr. McCoy" so they can do a double-take.
  • Ladies and gentleman, the entire comic was leading up to that. That was the whole reason for this thing.
  • This was followed by a Star Trek: The Next Generation/X-Men crossover that was a sequel to both the first crossover and to Star Trek: First Contact, and that crossover was continued in a novel.
• Star Trek: The Original Series/Legion of Super-Heroes, from IDW and DC Comics. Interestingly transplants both sets of characters to a third universe; a Legion-flavoured version of the Mirror Universe where the Imperial Planets' Starfleet wears both the Sword-and-Earth crest and the Science Police badge, and the resident Proud Scholar Race have pointy ears and arched eyebrows and green skin and blond hair. Oh, and The Emperor of The Empire? Vandal fucking Savage (Or is it an evil Flint?)!
  • Asking yourself just how he became so powerful, aren't you? Answer: He's got ''Q'' trapped.
  • DC and IDW also collaborated on a Star Trek/Green Lantern crossover, which was successful enough to warrant a sequel. The sequel revolves around the Enterprise crew accidentally finding six rings on the remains of Mogo, leading to Uhura becoming a Star Sapphire, Chekov becoming a Blue Lantern, Bones becoming a member of the Indigo Tribe and a vengeful Khan becoming a Red Lantern.
• Star Trek: The Next Generation/Doctor Who: Assimilation²: The Enterprise NCC-1701-D gets visited by a certain blue box. They fight the Borg and Cybermen. And, as a bonus, an earlier incarnation of the Doctor encountered an earlier incarnation of the Enterprise.
• Star Trek: Deep Space Nine/Doctor Who - Domination was going to be a crossover set around the time of the Dominion War.
• Planet of the Apes crosses over with Alien Nation in one comic. The resulting title is Ape Nation.
• Phil Foglio's graphic novel adaptation of Robert Asprin's Another Fine Myth features a Law Machine from his own Buck Godot: Zap Gun for Hire universe:
  Aahz: That was our introduction to…the Law Machine. We were all dimensional travelers...I haven't seen a Law Machine before or since.
• Batman crossed over with Grendel twice, with the two crossovers featuring different Grendels. Batman is canonically one of only three people to be able to fight original Grendel Hunter Rose on equal terms, the other two being Argent the Wolf and also The Shadow, who was actually able to defeat Grendel in single combat. Notably, both Batman crossover stories are fully in continuity for Grendel.
• Batman/Hellboy/Starman (a two-issue DC/Dark Horse crossover) is Exactly What It Says on the Tin.
• Dark Horse had also planned a crossover between Superman and Dirty Pair, but it sadly never materialized.
• A very unique one concerning Spider-Verse. Because of its Tag Line of "Every Spider-Man Ever", it has the unique ability to drag in just about every possible Spidey canon, outside a few that are Screwed by the Lawyers. One of those is the Disney/Marvel cartoon Ultimate Spider-Man, which has its own Spider-Verse storyline going on at the same time. It's... very confusing.
  • To make it even more confusing, Ultimate Spider-Man had a crossover with Jessie, which is a live-action comedy series on Disney Channel.
• The IDW X-Files Season 10 comic had a short series where the Lone Gunmen met the Ghostbusters, the Teenage Mutant Ninja Turtles and the Transformers. All of them were involved (unwittingly) in the creation of a virus.
• Cartoon Network Super Secret Crisis War featured characters from no less than ten Cartoon Network series. The main storyline featured heroes and villains from Ben 10: Omniverse, Samurai Jack, Dexter's Laboratory, The Powerpuff Girls and Ed, Edd n Eddy, while a set of one-shots involved Cow and Chicken, Johnny Bravo, The Grim Adventures of Billy & Mandy and Codename: Kids Next Door.
• In 2015, Japan's Brutus magazine published a one-off crossover between Attack on Titan and The Avengers. This may well be the only time you ever get to see the Titans being on the wrong end of a Curb-Stomp Battle, with even the Female Titan being taken out in one hit by Iron Man.
• In 2015, Groo and Conan met face to face. Weird interdimensional hijinks (and Sergio Aragonés being under the influence of every legitimate medicinal drug all at once) were responsible.
• Vampirella has done a number of crossovers with characters from other franchises, mostly towards the later years of the Harris Publishing run of the comic. These include Lady Death, Witchblade, Shadowhawk, Alien, and Evil Dead.
• Cyberforce, another Top Cow series, has had crossovers with the Justice League and the X-Men.
• Lumberjanes had a crossover miniseries with another female-focused YA adventure comic Gotham Academy, which notably had no apparent "inter-dimensional" element despite the former being a standalone creator-owned series and the latter happening in the DCU.
• A 2015 Dutch Disney Ducks Comic Universe book, Donald Duck: Superhelden Special had Donald auditioning for a Spider-Man movie, only to end up teaming with the real Spider-Man (who, in the Ducks universe, is a Dogface). There was even a cameo by a Dogface Stan Lee!
• My Little Pony:
  • My Little Pony Generations is a crossover between the first and fourth generations of My Little Pony, which occur in separate continuities.
  • My Little Pony/Transformers: Friendship in Disguise! is a crossover between My Little Pony: Friendship Is Magic and The Transformers.

Fan Works

• Paradoxus is an exemplary case of the Rule 50 because it mixes two franchises that definitely don't belong to the same continuity and don't even target similar audiences: Western Animation/Winx Club and World of Warcraft. Again, YMMV about whether it's a Weird Crossover, but its authors have made quite the effort to mesh both universes as seamlessly as you can get given the circumstances.
• Super Milestone Wars and its sequel, Super Milestone Wars 2
• Buffy the Vampire Slayer seems to be a bit of a crossover whore in fanfics. Crossovers include Halo, CSI, every Batman continuity, Stargate-verse, and plenty of others. A lot of the Halo crossovers are YAHFs ("Yet Another Halloween Fic", referencing the Season 2 Halloween episode in which everyone got turned into their costumes) where Xander becomes John-117; these have an odd tendency to become Stargate SG-1 crossovers at the same time. There are even a couple Animorphs crossovers, despite Buffy being referenced as fictional in the Animorphs books. Merlin naturally has some, due to Anthony Head playing main roles in both series.
• The online Fan Film Haloid, a truly impressive Halo/Metroid crossover. Technically, also a Dead or Alive crossover.
• Dead Fantasy, a crossover series by Monty Oum (the same guy who created Haloid), consists primarily of stunt-laden over-the-top battles between characters from Dead or Alive, Final Fantasy, Ninja Gaiden, and Kingdom Hearts.
• Anything by Ten-faced Paladin that isn't an Alternate Universe Fic is a crossover (sadly, a couple of them are Dead).
• There is actually a rather good one between Avatar: The Last Airbender and Harry Potter. here. He rationalizes the events as an influence for Zuko's Heel–Face Turn, and Malfoy's hesitation. And it's actually partially believable as well.
• There's a Sonic the Hedgehog/Mighty Ducks crossover (no, seriously) here which definitely qualifies, while also doubling as an Original Flavour story.
• There's a Harry Potter/The Princess Bride fanfic which features Harry as Inigo, Hermione as Buttercup, and Dumbledore as the omniscient dream narrator who breaks the fourth wall repeatedly.
• The epic Star Wars/Star Trek crossover fic Unity. For the record neither side really "wins," and for the whole second half the main character is the son of one Wars and one Trek character.
• ''Trek Wars: The Furry Conflict'' not only has one of the worst names in fiction, but is also one of the best and longest running Star Wars vs. Star Trek crossovers out there, having been started in 1996 and continuing to this day. Several things set TFC apart from the rest are that (a) all the characters are furries with few exceptions, (b) the ST universe turned out a lot better than canon while the SW universe took a decided turn for the worse, (c) the whole script is played out in a roleplay then transcribed to the net, and (d) none of the main characters from either franchise get more than a passing mention. In other words: it's a self-described Dramatic Parody that does a fairly good job of meshing the two universes, thanks to a big fat Negative Space Wedgie. It even has its own wiki!
• An early Star Trek fanfic (created after Season 2) crossed over with The Muppet Show with the excuse that Doctor Bob (Rowlf) was the ship's new doctor. Read the resulting hilarity here.
• The fanfic The Chronicles of the Nine Kingdoms is essentially all the Nintendo Worlds (with a few other worlds that have appeared on Nintendo systems, like Dragon Warrior Monsters) crossed over together with the Mario world as a centerpiece for a quest against evil. The author even takes it farther by planning to cross his fanfic with a Metroid fanfiction written by his friend.
• Fuku Fic — Ranma ½ fanfics involving Ranma wearing a Sailor Fuku akin to those in Sailor Moon, with some such fanfics involving a crossover between the two series.
• Both Syllables is a fairly well-known crossover between Invader Zim, Buzz Lightyear of Star Command, and Lilo & Stitch: The Series.
• An online fanfic crossover between Star Trek: The Next Generation and Babylon 5 contained a scene where Data tells Captain Picard that "techobabble will not work in this Universe, Captain. We are stuck with obeying the laws of Physics."
• There's been a few The Familiar of Zero stories where Louise instead summons a different familiar from another series. So far we've had Edward Elric from Fullmetal Alchemist, Chrono Harlaown from Magical Girl Lyrical Nanoha and Grimlock from Transformers: Generation 1.
  • And Shirou EMIya (partial caps intentional) of Fate/stay night in The Hill of Swords.
  • Also, Jack Ryan in Zero's Shock and ALEX FREAKING MERCER in Unfamiliar.
  • And then there's A Green Sun Illuminates the Void, an Exalted crossover where, after failing to summon a familiar, Louise is Exalted as a Green Sun Princess...
• Since they are both looking for the Philosopher's Stone, there are a number of fanfics where Harry Potter and Edward Elric meet.
• There is an obscure X-Files and MST3k fanfic called The Project (link leads to a MST-ing of the fanfic). While the plot is rather generic for an X-Files fanfic, the real charm of it comes from the fact that the author seems to have seen about five minutes of MST3k, leading to Joel being emo, having people die from watching bad movies and Dr. Forrester Took a Level in Badass and kills Joel; it's absolutely hilarious.
  • A less serious take on the concept is S.O.L., which at least has less OOC on the MST3K side (The author even mentions The Project in their note).
• TypeMoon vs. Godzilla. Really. It's a fanfic novel that may be in Japanese, but the art created for it is enough to tantalize everyone.
• The Doctor and the Enterprise, a Crossover Fan Fic that predates the Internet, was eventually published with the Star Trek and Doctor Who serial numbers filed off.
• The Sin City and Batman fanfic called A Dark Knight over Sin City.
• A surprising number of Harry Potter and YuYu Hakusho crossovers are floating around on the Internet. The plot usually has the Yu Yu Hakusho cast infiltrate Hogwarts (with The Best Defense probably being the best one, and likely something of a precursor to the rest).
• Suikoden Fantasy, a crossover of Final Fantasy VI and Suikoden III.
• Kitsune on Campus manages to place Naruto in the Negima! Magister Negi Magi universe.
• Goku/Anne Frank: Until the End of Time. If the notion of a Dragon Ball Z/Anne Frank crossover hasn't made your brain implode already, wait until you get to the part where Hitler becomes a Super Saiyan.
• When Wario Met Mrs. Cartman, which is, well, about Wario meeting Cartman's mom. It's also a brain-melting Massive Multiplayer Crossover.
• Heero Potter, where Heero Yuy is Harry's son, Duo Maxwell is Duo Weasley, Trowa Barton is Trowa Weasley, and Quatre Raberba Winner is Quatre Malfoy. I never knew the After Colony years started sometime soon after Harry Potter allegedly ended.
• Because of the popularity of background character "Dr Hoof/Whooves", there are a swarm of crossovers between Doctor Who and My Little Pony: Friendship Is Magic. It is even the case that many fics that aren't an actual crossover will have the Doctor as a side character and more or less explicitly make clear that yes, he is the time-travelling alien beloved by fans; he just regenerated as a pony.
  • In fact, due to the popularity of Friendship is Magic, and very prolific fanfic writers, My Little Pony: Friendship is Magic has crossed over with just about everything, from The Dresden Files to Stargate SG-1.
• Stars Above, a crossover between Lucky Star and Puella Magi Madoka Magica.
  • And by the same author, Respect, crossing over Madoka with Smile Pretty Cure!.
  • Also by the same author, Shattered Skies: The Morning Lights, crossing over Sailor Moon, Cardcaptor Sakura, the first ten Pretty Cure continuities, Lyrical Nanoha, and Madoka Magica.
• Battlestar Galactica (2003) and Battletech crossovers have a bit of popularity due to the similarity of their FTL systems.
• Connecting the Dots, an intercontinuity crossover between the DC Animated Universe (Justice League in particular) and Naruto, along with a few thousand random cultural references. Think Superman fighting Naruto. It also features characters from the 2003 Teen Titans series. This creates some continuity problem given that Robin in Teen Titans is supposed to be Dick Grayson, while Dick in the DCAU had already become Nightwing and been replaced by Tim Drake as Robin prior to the events of Justice League during Batman: The Animated Series. The writer has acknowledged that as an oversight in the author's notes of Chapter 10.
• The Powerpuff Girls:
  • Law and Bubbles, probably the only time you'll see the girls and the Law & Order cast.
  • Callisto Meets The Powerpuff Girls does this with Xena: Warrior Princess. Johnny Bravo gets a cameo.
• Highlander attracts a lot of crossovers as well, mostly because there are many characters that it's easy to make immortals. Stargate SG-1 occasionally gets pulled in because of Peter Wingfield guest starring on SG-1. It also has been crossed with Buffy the Vampire Slayer due to both series having groups of Watchers.
• Animorphs is another series that's something of a crossover magnet because it's very easy to work in people who are controllers. It's been crossed with CSI, and Maximum Ride is a frequent crossover because of similarities between The Flock and Tobias. Buffy the Vampire Slayer and Roswell were both crossed with it despite both shows being referenced as fiction in the books.
• Several arcs of You Got HaruhiRolled! feature characters from other series interacting with the Haruhi Suzumiya characters. The pirate arc has, as its villains, the main characters of Lucky Star. Chapter 86 has a story in which Batman and the Joker fight it out at a baseball game Haruhi attends. But it is the court case arc which goes to the next level, operating with the conceit that all characters from every work of fiction ever live together in a single city, thus allowing for a Massive Multiplayer Crossover where characters from countless fandoms take part in Haruhi's trial in one way or another.
• The Starlight Series attempts to seamlessly weave the Lilo & Stitch universe with Star Trek (in Starlight and Aftermath) and Cardcaptors (in A Trip To Japan). The former pits the gang up against the Borg.
• "Remembrance of the Fallen" is a crossover between two separate Star Trek Online fan work continuities: StarSword's Bait and Switch and the Shared Universe The War of the Masters.
• Tails of the Old Republic inserts Miles "Tails" Prower from the Sonic the Hedgehog franchise into the Star Wars videogame Knights of the Old Republic and puts special attention on detail and characterization. Probably the longest-running Sonic/Star Wars crossover on the 'net.
• Seems to be the staple of Mass Foundations so far. Fallout and Mass Effect for the first entry. In another entry, Fallout had crossed over with Doctor Who and another setting, which turned out to be Soulcalibur.
• There was a competition between most of the major Fantasy series — based on popular opinion, not on what makes any sense. For example, The Dragon Reborn, Harry Dresden, and Kvothe all lost to muggles. Each one had a written description of the battle — and despite the implausibility, it was awesome.
• Point Me at the Skyrim is an intercontinuity crossover between Ward and The Elder Scrolls V: Skyrim, having the superheroine Antares in the High Fantasy setting of Skyrim, and exploring the resulting culture shock.
• Boldores and Boomsticks features Team RWBY falling through an Ultra Wormhole into the world of Pokémon: The Series.
• Brutal Mario is a crossover between Super Mario World, Trials of Mana, Mega Man (Classic), Kirby and many more. Levels from other games are recreated faithfully, and you even fight the Mammon Machine in the Ocean Palace.
• Too Huge To Be True manages to cross Chip 'n Dale: Rescue Rangers over with TaleSpin. Normally, these series are completely incompatible with one another, but the fic makes TaleSpin a Show Within a Show, and Gadget dreams most of the story.
• The Coffin of Roboute and His 20 Sisters reveals that in the distant past of Terra, the Emperor of Mankind was once a wandering warrior destined to wear the jeweled crown of Aquilonia upon a troubled brow. That is to say, rather than being an homage as in canon, Coffin's Emperor is literally immortal psychic Conan the Barbarian - colored drastically by tens of thousands of years of experience, but Conan of Cimmeria nonetheless. And indeed, Conan!Emps in 30K is every bit the unga-bunga space barbarian you would expect at heart. The events of that distant past age have little to nothing to do with the present reality of the setting, but they do significantly inform the Emperor's character, both in outlook and action.

Films — Animation

• Several animated film studios do toolkits that combine characters from some of their films.
  • DreamWorks Animation does this from time to time, mainly with characters from Shrek, Kung Fu Panda and Madagascar.
  • Pixar used to do this in their bloopers and credits.
  • Laika normally does this to celebrate holidays.
  • Illumination Entertainment does this more often than you'd expect, from pairing up the minions with charcters from other franchises to bringing them all together, in their marketing and logos.

Films — Live-Action

• Freddy vs. Jason.
• Randolph and Mortimer Duke from Trading Places — reduced to homeless poverty by the events of that film — show up in Coming to America. They fail to notice Prince Akeem's uncanny resemblance to Billy Ray Valentine.
• As a random gag in the third act of Wayne's World, Wayne gets pulled over by a cop on a motorcycle… who turns out to be the T-1000, looking for John Connor. He shows up again in Last Action Hero.
• In Joe Dirt, Farmer Fran from The Waterboy tells Joe "Home is where you make it."
• In Casper, the bad guys attempt to de-haunt the house using the services of Father Guido Sarducci, and Dr. Ray Stanz from Ghostbusters ("Who you gonna call? Someone else!") According to The Other Wiki there was also a scene filmed with Zelda Rubenstein (Tangina Barrons from Poltergeist) but it was cut.
• In Little Nicky, when Nicky goes to Heaven he finds Chubbs, who had died in the earlier Adam Sandler film Happy Gilmore, as a dance instructor.
• King Kong vs. Godzilla, in which the King of Monsters and the Eighth Wonder of the World duke it out on Mount Fuji. It is epic.
• George of the Jungle ends with George holding George Jr. over the very same rock where Simba was similarly held. It's all Disney. And George kicked some serious lion's ass, so it could be canon.
• The comic book Star Wars Tales #19 has an alternate history story where Han and Chewie crash-land the Millennium Falcon on Earth, where it is found 126 years later by Indiana Jones. Later, Industrial Light & Magic was hired to do the effects for Star Trek: First Contact, and some wiseguy at ILM snuck the Falcon into the Battle of Sector 001 as a Freeze-Frame Bonus/Easter Egg.
• Christopher Walken said that when he read the script for Click, he decided that Morty was the same character as Gabriel in The Prophecy and played him accordingly. This is especially noticeable if you watch the two films back-to-back. "It's time to come home".
• Alien vs. Predator (though that may have actually fully merged the continuities, depending who you ask).
• Only in Who Framed Roger Rabbit will you see Bugs Bunny and Mickey Mouse, Donald and Daffy Duck, Betty Boop, Woody Woodpecker and a host of other classic cartoon characters in the same room together!
• In Pokémon Detective Pikachu, Tim Goodman walks into his father's apartment where Angels with Filthy Souls from Home Alone is playing.
• After Doctor Strange's spell to remove public knowledge of Peter Parker's identity goes horribly wrong in Spider-Man: No Way Home, in a first for the Marvel Cinematic Universe, the franchise crosses over with the other Marvel franchises — specifically, the Spider-Man Trilogy and The Amazing Spider-Man Series, with Spidey facing off against the Green Goblin, Doctor Octopus, and Sandman from the former, and the Lizard and Electro from the latter.

Literature

• Star Trek: The Original Series tie-in novel Ishmael by Barbara Hambly is an unlicensed crossover with the 1968-1970 ABC series Here Come the Brides, including several Mythology Gags spanning both series and a number of Shout Outs. The book also has crossover elements from Have Gun – Will Travel, Doctor Who, Star Wars, Battlestar Galactica (1978), Bonanza, and Maverick, making it also a Massive Multiplayer Crossover.
• There is a novel where Picard meets the X-Men: (Planet X). It includes a rather awesome Hilarious in Hindsight moment when people point out how much Professor X looks like Captain Picard. This is made even funnier by the realisation that the book was published over a year before X-Men was filmed. There are apparently very few charismatic bald actors to go round...
• Diane Duane is a Doctor Who fan, and as a result the Doctor (in different incarnations) has appeared in both her Young Wizards series and in one of her Star Trek novels.
• Neil Gaiman won a Hugo Award for A Study in Emerald, his crossover between Sherlock Holmes and the Cthulhu Mythos. Deservedly — the story is awesome. It can be read here for free, in nifty newsprint format. Do so now.
• The basic concept of the Thursday Next books is that all novels are connected through the Bookworld, and Thursday can travel to them. For obvious reasons, the books Thursday enters are mostly public domain, but the cast of Enid Blyton's Shadow The Sheepdog, Beatrix Potter's Mrs Tiggywinkle and Kathy Reichs' Temperance Brennan have all appeared with permission. (Of the estates in the first two cases, obviously.)
• The Doctor Who character Iris Wildthyme (see here for character tropes) started out in a wildly unrelated series of non-genre novels. The author proceeded to use her in Doctor Who novels with no change whatsoever to her character. She then got her own Big Finish spinoff and a number of appearances in the comics. Unlike with other not-quite-canon Doctor Who companions, Big Finish makes no effort to prevent a Continuity Snarl with her, and Iris somehow being part of several different continuities all at once is considered part of her charm. Within her own series, Iris also has a tendency of travelling to other fictional universes, such as meeting up with Robin Hood.
• The Doctor Who New Series Adventures novel The Coming of the Terraphiles, by Michael Moorcock, is a crossover with Moorcock's Second Ether sub-series, absorbing the Doctor Who expanded universe into Moorcock's Multiverse. (Moorcock’s story “The Vanishing Tower”, had already featured some suspiciously ‘’Doctor Who’’ elements, including the TARDIS-like vanishing tower itself.)
• In a story that Karl Edward Wagner contributed to Tales of the White Wolf, Kane of Kane Series makes an uneasy temporary alliance with Elric.
• W.G. Grace's Last Case by Willie Rushton is set a few years after the Martian invasion from The War of the Worlds, and has the real cricketer Grace investigating a murder with the help of Doctor Watson, who is at a loose end after Sherlock Holmes fell down the Reichenbach Falls. Along the way they meet Doctor Jekyll and a whole host of Mister Hydes.
• Temeraire: The Golden Age and Other Stories collection of varyingly canon side stories includes "Dragons and Decorum", wherein Pride and Prejudice's Elizabeth Bennet is a Dragon Rider in Temeraire's British Aerial Corps.
• Joanna Russ included a reference to Fahfnr in The Adventures of Alyx as a Shout-Out, with Alyx claiming he was a former lover. Fritz Leiber then confirmed the relationship in later Fafhrd and the Gray Mouser stories.
• Courtney Milan did this to two of her own projects, writing an explicitly non-canon side story for her website crossing over her Brothers Sinister historical romance series, set in the 1830s-1880s, with her Cyclone series set in 21st-century Silicon Valley. Time travel is involved.
• Haganai and Student Council's Discretion have two crossover stories, each written by the series' respective authors.

Live-Action TV

• The king of the intercontinuity crossover is undoubtedly Detective John Munch, played by Richard Belzer, who has appeared as of Summer 2007 on ten different programs. Originally a regular on Homicide: Life on the Street, during the course of that series he appeared in three crossovers with Law & Order. When Homicide finished he went on to become a regular in Law & Order: Special Victims Unit. Not only that, but he also made guest appearances in Law & Order: Trial by Jury, The Beat, Paris Enquêtes Criminelles, The X-Files, Arrested Development, and Sesame Street. And in August 2007, he filmed an episode for the fifth season of The Wire.
  • Interestingly, there's an episode of Homicide in which Munch refers to people "watching The X-Files." You could take this as a paradox, or you could figure that Munch — a hard-core conspiracy theorist — leaped at the chance to play himself in an X-Files episode. Which might explain why the interrogation room in that X-Files ep looked completely different from the interrogation room in Homicide.
  • There is uncertainty over whether Belzer appears as Munch on The Wire; the character was not named and received a generic billing. He mentioned that he used to own a bar, however, which he did in Homicide, so there's some evidence that it was intended to be Munch.
  • Taken even further with Luther, in which the titular character tells a subordinate to check out an American felon by sending their profiles to Munch in New York. Celebrity Paradox kicks in, considering that the London cop John Luther and Baltimore gangster Stringer Bell in The Wire are both played by Idris Elba.
• MTM shows did this occasionally. Carla from Cheers talked about having given birth at St. Eligius, aka St. Elsewhere, and the doctors showed up at the Cheers bar once. Sam also once directed patrons to take an ailing man to St. Eligius. Similarly, Bob from The Bob Newhart Show made reference to St. Eligius, while Bob's secretary Carol showed up on Murphy Brown as a temp for Murphy, thereby enfolding it into the autistic daydream which ended St. Elsewhere. See above for more information.
• The TARDIS, the Living Ship from Doctor Who, has appeared in the sitcoms Red Dwarf (set in the far future) and Chelmsford 123 (set in 123 AD).
  • The Doctor and Rose showed up for a panel of Buffy Season 8, which means that aliens and demons may (if it's canon) exist in the same universe.
  • The Doctor Who/EastEnders crossover (of very dubious quality, but it was for charity) Dimensions in Time could also be mentioned, although it's actually not in either of the shows' continuities (and indeed, since then they've both featured each other as fictional programmes).
  • The Kaldor City Doctor Who Expanded Universe audio dramas written by Chris Boucher and produced by Magic Bullet are set in the titular city from the Doctor Who story The Robots of Death (also by Boucher), but feature Scott Fredericks reprising the role of Psychostrategist Carnell from the Blake's 7 story "Weapon" (also by Boucher). A History by Lance Parkin (an exhaustive unofficial history of the Whoniverse) makes a valiant attempt to claim that B7 may well be set in the Whoniverse, but really it's probably best to assume he's an Alternate Universe counterpart. Or just don't worry about it. (There's also a cynical manipulator played by Paul "Avon" Darrow, who knows more about Carnell's Federation background than the Kaldorians, but let's not even get started on that...)
  • Similarly, back in the heyday of Marvel Comics' British arm, there were several crossovers between the Doctor Who Expanded Universe (or at least the DWM comics branch of it) and the Marvel Universe. The first and most notable was the Special Executive, a Time Travelling Ragtag Bunch of Misfits created by Alan Moore. Originally introduced in DWM as ancient Gallifrey's Special Ops, they later appeared in Moore's Captain Britain, where they were mercenaries.
  • Marvel also linked Doctor Who with Transformers, by way of bounty hunter (sorry, "freelance peacekeeping agent") Death's Head. This is a borderline case, however, as the link only occurred when Death's Head fell through a dimensional rift from the Marvel UK Transformers universe and ran into the Doctor as a result.
    • In a more solid (possibly) example, the obscure character Octus has been stated to have a Dalek altmode. He was never seen transformed, but Word of God says that's what he turned into.
  • Gallifrey itself... or rather what was left of it... shows up in the Power Rangers Lost Galaxy episode Green Courage with Coordinates to boot,◊ This aired in 1999, six years before the new series, by the way.
• It appears that the soap opera Passions has set itself up as a sequel of sorts to the classic Fantastic Comedy Bewitched. It features Juliet Mills as Tabitha Lennox, a genuine witch whose daughter is named Endora and whose parents are a mortal named Darrin and a witch named Samantha. Furthermore, Bernard Fox has made two appearances on the show as his Bewitched character, Dr. Bombay.
• The Power Rangers in Space encountered the five Turtles from TMNT: The Next Mutation... but, uh, we don't like to talk about the latter group around here (and neither do Eastman and Laird).
  • On the other side of the Pacific, the world of the Samurai Sentai Shinkenger had an unexpected visitor in Kamen Rider Decade. The crossover is in continuity for both shows; in fact, the fact that the Shinkenger world is the only world in Decade that is the genuine, canonical universe of the show in question rather than an Alternate Universe (original worlds aside) is a plot point for the arc. ^note Speaking of which, Power Rangers already beat Super Sentai at a Kamen Rider crossover long ago with Mighty Morphin' Power Rangers' Poorly Disguised Pilot for Masked Rider.
    • Ultraman vs. Kamen Rider is actually more of a team-up special than a fight with the protagonists being portrayed by Fake Shemps, but still awesome.
    • Super Hero Wars: Kamen Rider vs. Super Sentai brings together 240 heroes across both franchises, and once again Decade is involved.
    • Kamen Rider Gaim had a canonical, hour-long crossover with Ressha Sentai ToQger. Unlike the previous examples, which were usually regulated to movies, this one actually aired on television as part of the series proper. Gaim was also involved in a later crossover with Kikaider.
• The Friends episode "The One With Two Parts" introduces Phoebe's twin sister Ursula, who was a character on Mad About You. Both had been played by Lisa Kudrow, so it was an obvious choice (to the network, at least) to make the previously unrelated characters twins. That same episode had Jamie and Fran from Mad mistake Phoebe for Ursula.
  • One episode of Mad About You itself revealed that Paul's old apartment was being loaned to Kramer from Seinfeld.
    • And later it was revealed that the series Mad About You exists in the Seinfeld universe. Maybe it's a reality show?
  • Another Mad About You episode had Carl Reiner guest star as Alan Brady, his character from The Dick Van Dyke Show. This created a bit of a paradox, because in an episode of Friends (which would seem to be in the same "universe") the characters are shown watching ''The Dick Van Dyke Show."
    • Not as much as you might think: The actual DvD show ended with Rob Petrie trying to find a buyer for his life story, and Alan Brady hinting that he might want to turn it into a show, which is so meta it hurts. So, it's possible that, in the fictional world where Rob, Laura, and Alan Brady live or lived alongside the Mad and Friends characters, Alan Brady eventually settled on Dick Van Dyke to play Rob Petrie — brain exploding must stop...
  • Also, Chandler briefly appeared in a Caroline in the City episode, and Caroline briefly appeared in a Friends episode.
  • Ross appeared in an episode of The Single Guy, playing an old schoolmate of Jonathan's.
  • Daphne and Niles of Frasier were on an episode of Caroline in the City, too, so that links Frasier (and, by extension, Cheers) into this little sitcom world, too.
    • And since Cheers linked itself to St. Elsewhere, that drags all of 1990s Must See TV into the autistic kid's dream.
  • Some people Fan Wank Greg House into the series as the passenger that tells Rachel off on her flight to England due to neither caring about the feelings of a nearby person and both being played by Hugh Laurie. Depite the fact Laurie clearly isn't playing the character as American.
• Early Edition crossed over onto Martial Law. Early Edition also featured several regular characters from Chicago Hope in one episode.
• Martial Law also had a crossover with Walker, Texas Ranger. The first episode takes place on Martial Law and begins with the characters standing in their station discussing a recent crime. Then a voice rings out from off-screen, saying "I hear you could use some help." And then the camera shifts to a pair of cowboy boots and slowly pans up to reveal Ranger Cordell Walker, illuminated by a bare lightbulb overhead like some pagan godling. Then he and Sammo team up to stop violent, genocidal white supremacist militia members attempting to steal chemical weapons to use to ethnically cleanse Los Angeles. This is followed by an episode of Walker, Texas Ranger where Sammo visits Texas to help finish up the case. Sammo's extra-sensory and clairvoyant Chinese Daoist powers are accepted by the Rangers without a word of doubt. As Walker's long-suffering partner Trivette explains, "Around here, we call that sort of thing "Cherokee."
• The Pretender had crossovers in paired episodes with The Profiler, and the relationship between the two characters was kept in the continuity.
• Despite concepts seemingly custom-made for crossovers, JAG and NCIS only crossed over for one two-parter. Though NCIS didn't exist as a separate show when the crossover happened. In other words, a Poorly Disguised Pilot.
  • JAG's Lt. Bud Roberts did appear in the first season NCIS episode Hung Out to Dry.
  • Meanwhile, Lt. Cmdr. Faith Coleman and a Navy SEAL played by Adam Baldwin appeared on both series.
• It's not quite Archie Meets The Punisher bizarre, but the special Alice two-parter that featured a visit from Boss Hogg, Roscoe and Enos from The Dukes of Hazzard (Boss Hogg was Not-Flo Joleene's cousin) is up there.
• ITV drama series Footballers' Wives briefly exported popular character Tanya Turner to Bad Girls (also produced by ITV) when Tanya was jailed during the plot.
• The creators of Lost and Heroes have discussed the possibility of intertwining their shows, but are largely unable to do so because they are on different networks. However, small details have crossed over. Characters on both shows have sported identical brochures for the fictitious Gannon Car Rentals.
  • Lost has also featured a few shoutouts to Alias, though it's unlikely they exist in the same universe due to Terry O'Quinn's characters in both shows being completely unrelated.
    • Actually, they do exist in the same universe, as a CIA agent is shown listening to one-hit wonder Drive Shaft, "You All Everybody", on his workstation. Ergo, Charlie Pace (played by Dominic Monaghan) is part of the Aliasverse, meaning LOST is part of it as well.
    • Likewise, an Oceanic Airlines flight to Sydney was mentioned in passing on Alias.
    • An Oceanic Airlines ad also appeared during the pilot episode of Flash Forward.
    • The disappearance of Oceanic Flight 815 was mentioned in passing on Fringe.
    • This could be because Oceanic Airlines is a generic name that a lot of shows use. The Other Wiki has details.
  • Also, the big "cork" on the bottle of evil at the end of the show pretty closely resembles a Hellmouth. Probably not intentional, but wouldn't it explain everything?
• Speaking of Lost, one of Chef Robert Irvine's missions on Dinner: Impossible was to cook for the cast of Lost. Though it was clear to everyone that Lost is only a television show, Nestor Carbonell did appear in character as Richard Alpert and Robert was given several Dharma food drops to work with, so it qualifies somewhat for this trope.
  • But wouldn't that put the Disney Theme Parks and Sesame Street in the same universe as well?
    • Yes. But as we know, everything exists in Tommy Westphall's mind anyway!
• In an episode of Reba involving a court, the judge is obviously intended to be Philip Banks from The Fresh Prince of Bel-Air, and is played by the same actor, despite Reba taking place in Houston and Fresh Prince taking place in California.
• Crossing Jordan and Las Vegas crossed over so often that it probably doesn't even qualify as intercontinuity crossover. They certainly take place far enough apart geographically that it's plausible that they're within the same continuity. I think that the Crossing Jordan characters made one more appearance in Las Vegas after their own show had been canceled, though both shows are now finished.
  • In one LV episode, Mary made a reference to booking a conference room for Dunder-Mifflin, and Heroes and the 2008 Knight Rider series have both made references. Linderman being involved would certainly explain the Montecito's high owner turnover rate. Don't combine it with the Lost bit above, though, or your head might explode.
• When a mentally ill patient filed a paternity suit against Dr. Kiley on Marcus Welby, M.D., the trial was resolved by Owen Marshall: Counselor at Law.
• Picket Fences crossed over into Chicago Hope (both shows created/executive produced/written by David E. Kelly and airing on CBS), when Fyvish Finkel's character Douglas Wambaugh checked into the hospital. They also poked at ER featuring a "commercial" for the hospital that parodied the opening credits of ER and later having one character say, "We don't like to talk about that other hospital."
• Because both series were produced by William Dozier, it was practically foreordained that The Green Hornet and Kato would make an appearance in Batman, which they did in the episodes "A Piece of the Action"/"Batman's Satisfaction", which aired on March 1 and 2, 1967, as well as an appearance in a brief "window gag" in another episode. The styles of the two shows didn't really mesh, however.
  • As for the styles of the shows not meshing, in the Hornet's "window gag" appearance (the earlier of the two appearances), Batman and Robin acknowledge his and Kato's status as heroes. In the later guest appearance, the episodes run with the standard "on police records a wanted criminal" plot device of the Green Hornet property, and entangle the Hornet/Kato and Batman/Robin in a Let's You and Him Fight standoff.
  • Later episodes would have Batman and Robin meet Colonel Klink from Hogan's Heroes or Lurch from The Addams Family in the window gag.
• USA Network does this on a regular basis in their ads. If you take, say, "Monk: A Tribute" as canon, Monk, Psych, Royal Pains, Law & Order: Criminal Intent, In Plain Sight, and Burn Notice all take place in one universe. Sooner or later, all of their major series end up there.
• Disney took this to an extreme, theming two entire episodes specifically for the crossover: That's So Suite Life of Hannah Montana and Wizards On Deck with Hannah Montana. They've taken it to an even further extreme and its most logical conclusion with practically every show on the network now existing in the Disney Channel Live-Action Universe through a series of tie-ins or direct crossovers.
• The Mythbusters appear in an episode of the original CSI (Vegas). From the way the segment is filmed its unclear whether they are intended to be fictional lab-techs, "themselves" visiting the lab, or a figment of Nick's imagination. However they later tested the same theory on Mythbusters, using clips from the CSI episode.
  • Speaking of CSI, that show once shared a rather odd crossover with the sitcom (and fellow CBS hit series) Two and a Half Men.
  • The franchise also crossed over with Cold Case and Without a Trace one time each (NY and Vegas respectively). Some consider those two plus the three CSI series to be one big 'verse.
• Fringe has a particularly interesting example of this trope. The Observer, or rather one of them, specifically September, whose task it is to police inter-dimensional travel and interferences with the timeline, has managed to crossover from the Fringe continuity... into the "real world". He appeared in the audience of American Idol and has been spotted in various stadiums during Fox sports broadcasts.
  • It's unclear whether the fact that Fringe Division's job used to be called the "X-Designation" is this or a Shout-Out.
• This one's a little older, but in an episode of The Jack Benny Program, Jack goes to court for supposedly murdering a rooster he owns. Who does he get as his lawyer? Perry Mason. Although it may not count officially, since it was All Just a Dream on Jack's part. Oh, and the true murderer? Perry Mason himself.
• An episode of Warehouse 13 included Douglas Fargo of Eureka. An episode of Eureka included Claudia Donovan from Warehouse 13. This is an example of a Shared Universe, as both shows (as well as Alphas) are part of the "Syfy Verse".
• R. Lee Ermey turned up in Season 1 Episode 4 of Pawn Stars in full Lock n' Load gear.
• Ally McBeal and The Practice had a two-part crossover special that started on Ally McBeal on Fox and was resolved in the next hour on The Practice on ABC, with several characters from each show appearing on the other show. Both shows were produced by David E. Kelley.
• Susan's niece was missing when her sister Chloe overdosed, and was found by the police in New York.
• Comic Relief frequently features entirely non-canonical intercontinuity crossovers. Notable ones include:
  • 1997's Prime Cracker, in which Fitz and DCI Tennyson hook up and decide that now they have a relationship they don't care who the killer is.
  • 1997 also had BallykissDibley, in which Geraldine desperately tried to convince a visiting Father Peter that her parishioners were normal.
  • 2009's When Janet Met Michelle, which combined all BBC Three's sitcoms about twentysomethings, as the cast of Two Pints of Lager and a Packet of Crisps invited characters from Grownups and Coming of Age to their fundraiser party. The title refers to the characters played by Sheridan Smith in Two Pints and Grownups, who did indeed meet.
  • One between The Catherine Tate Show and Doctor Who (with a bit of Recursive Canon).
  • In 2013, a skit with the 1950s midwives from Call the Midwife inexplicably in a modern maternity ward got even more bizarre when the increasingly exasperated father called for a doctor, and the TARDIS materialised.
• Similarly, 2010's Children in Need telethon included East Street, in which a bunch of characters from each soap arrive at the location of the other one, including Gail Platt and Denise Johnson competing to see who has the most tragic backstory. The cliffhanger ending was that Liz Macdonald is Kat Moon's mother, in a direct parody of the revelation that Kat is Zoe's mother. See also the Doctor Who entry above for an earlier Children in Need 'Stenders crossover.
• Bryan Fuller likes to do this. Marianne Marie Beetle was a tenant of Jaye's trailer park in Wonderfalls, and then showed up at a competition in Pushing Daisies, despite the fact that Jaye's brother in Wonderfalls plays the main character, Ned, in Pushing Daisies, so they exist in the same universe, technically. And Jaye's mother is also Mother Superior in the second season of Pushing Daisies.
  • And Ned mentions the Happy Time Temp Agency by name, so Pushing Daisies and Dead Like Me exist in the same universe as Wonderfalls, which makes the Celebrity Paradox even more fun, because Jewel Staite plays a to-be-reaped record store employee in Dead Like Me, and then later played Jay's boyfriend's ex-wife in Wonderfalls.
  • Now Hannibal is part of the continuity. Gretchen Speck (she dropped the Horowitz in the divorce, apparently), from Wonderfalls, is in Hannibal, and played by the same actress. (And in Bryan Fuller fashion, Celebrity Paradox kicks in, because Caroline Dhavernas is in both.)
• The Nick Verse includes several Dan Schneider productions like Zoey 101, iCarly, Victorious, Sam & Cat and Drake & Josh as the core of the Shared Universe. However:
  • It also includes Sketch Comedy shows All That and The Amanda Show.
  • It also includes Yo Gabba Gabba! which had crossovers with Big Time Rush and True Jackson, VP.
  • Carlton Banks from The Fresh Prince of Bel-Air shows up in an episode of Big Time Rush, which puts the entire Nick Verse into the St. Elsewhere "It Was All A Dream" continuity.
    • Actually, that character wasn't actually Carlton, as the character's named Captain McAllister. And, even then, there are continuity problems elsewhere. Drake Bell appeared as himself in an episode of Zoey 101, not Drake Parker, and Drake & Josh was shown to be a TV show in episodes of iCarly and Victorious, but characters from each later appeared on iCarly. Not only that, but Miranda Cosgrove appeared as herself in the Christmas special of Big Time Rush, pretty much signifying those aren't in that continuity.
• Niecy and Hakeem from Moesha appeared together in an episode of Clueless after UPN picked up that series.
  • This became a trend when Niecy appeared on Girlfriends and Maya appeared on Moesha as the aunt of Dorian's stepsiblings.
    • The character Peaches from Girlfriends made an appearance on Eve (2003). Taking all the connecting shows into account, Brandy has masqueraded as no less than four people in the UPN-verse: Moesha, herself, Chardonnay (The Game (2006), spinoff of Girlfriends), and a mystery caller on Sabrina, the Teenage Witch (which crossed over with Clueless).
• Angel: Illyria appeared in Fallen Angel: Reborn.
• Blake's 7 featured a non-humanoid alien menace that in the end was never shown on-screen. Word of God says that they were the Daleks from Doctor Who, and were originally intended to be shown, opening up the possibility of more crossovers between the two that sadly never came to pass.
• To celebrate German reunification in 1991, the popular West German cop show Tatort (Scene of the Crime) and its East German counterpart Polizeiruf 110 (Call the Police - 110) did a crossover Tatort episode in which the two shows' teams found themselves Working the Same Case.
• Arrowverse:
  • After his show was canceled by NBC, Matt Ryan guest starred as John Constantine in Arrow Season 4, which not only takes place in a different canon, but also a different network. The CW intended the crossover to be a prelude to Constantine joining the Arrowverse, but rights issues prevented Constantine from appearing again until two years later, when he guest starred in Legends of Tomorrow Season 3; it wasn't until Season 4 that the creators found a way to integrate him as a cast member.
  • Supergirl, originally an unrelated show on CBS, had Grant Gustin crossing over as Barry Allen from the 2014 Flash show for its 18th episode. When the show was greenlit for a second season, CBS passed it over to its sister channel The CW because of budgetary reasons. Since then, the series has transitioned well to the Arrowverse, joining its annual Crisis Crossover.
  • The Elseworlds crossover event had John Wesley Shipp reprise his role as Barry Allen from the short-lived 1990 Flash series that aired on CBS.
  • Crisis on Infinite Earths is the biggest instance of this in the 'verse. Not only did it bring Black Lightning (2018) into the Arrowverse, it also featured many actors who had played, or were playing, characters from unrelated DC media. And, with the exception of the Titans (2018) and Doom Patrol (2019) whose archive footage were used instead, they actually did appear this one time to reprise their roles. These included the 1989-97 Batman films (courtesy of Robert Wuhl as Alexander Knox), the 1960s Batman series (Burt Ward as Dick Grayson), Smallville (Tom Welling and Erica Durance as Clark Kent and Lois Lane), Superman Returns (Brandon Routh as Clark Kent), Birds of Prey (Ashley Scott and Dina Meyer as Helena Wayne and Barbara Gordon), Lucifer (Tom Ellis as Lucifer Morningstar), and the DC Extended Universe (Ezra Miller as Barry Allen), in addition to the aforementioned 1990 Barry Allen. It also marked the debut of the would-be Justice Society of America from Stargirl, which started streaming on DC Universe several months after the crossover event.
  • Humorously subverted with the Legends of Tomorrow episode "Zari, Not Zari". The promos indicated that the episode would somehow cross the show over with Supernatural, which was ongoing on The CW at the time but had absolutely no connection with DC Comics whatsoever. Indeed, it didn't; the Legends merely visited the show's set in Vancouver (they even saw Baby!), in one of the most blatant Leaning on the Fourth Wall moments known to man.

Pinball

• The Party Zone is this for the various "party" pinball games by Dennis Nordman — it crosses over characters from Party Animal, Elvira and the Party Monsters , and Dr. Dude.

Professional Wrestling

• New Japan Pro-Wrestling has Jushin Liger, Tiger Mask, and Black Tiger, all of whom were manga and or anime characters before NJPW licensed their likenesses and created wrestlers out of them. It makes sense for Tiger Mask and Black Tiger, as the anime they originate from was about wrestling in the first place, but Jushin Liger was created for a Henshin series that takes place 20 Minutes into the Future about a holy warrior with the power of the liger (half-lion, half-tiger) who battles evil aliens bent on destroying the world. Makes sense.
• A running gag in Mexican wrestling, though it's been seen elsewhere too. CMLL had the Thunder Cats as one of its trios, for instance.
• When Hulk Hogan's first movie, No Holds Barred, hit theaters, the WWF thought it'd be a good idea to bring in the villain of the film, Zeus, to battle Hulk in a WWF ring. They were never really clear on whether this was supposed to be the movie character come to life, or the actor assuming the character's persona to wreak havoc (in some promos, he'd lean one way, in others, the other), but one thing was absolutely clear throughout the entire angle: it was WrestleCrap.
• RoboCop (yes, RoboCop!) appeared at WCW's Capital Combat 1990 to rescue Sting from a cage he was placed in by The Four Horsemen.
• Chucky (the Creepy Doll from Child's Play) interrupted a Rick Steiner promo. Sadly, he didn't take up Rick's challenge to meet him in the ring.
• In 2011, Ice Ribbon came under attack from Kaori Hoshi and Big Devil from the television drama Muscle Girls during the first anniversary of one of their own shows, 19 O'Clock.
• Jimi Mayhem, who has a Shogun Of Harlem, gimmick, actually interrupted a showing of The Last Dragon, which is where his gimmick comes from, in New York. From there, Vendetta Pro would actually host a contest between "Shonuff" and Bruce Leroy, the actual Bruce Leroy (who in fact wasn't making his pro wrestling debut, as he had previously served as Jimmy Wang's manager in Ring of Honor)

Tabletop Games

• Spelljammer fan campaign: Second Unhuman War as an extension of the Blood War — that is, between Elves corrupted and manipulated by Tanar'ri and Scro corrupted (if they need more) and manipulated by Baatezu.
• Die, Vecna, Die was an intercontinuity adventure module, intertwining events in Greyhawk, Ravenloft, and Planescape.
  • Planescape, along with Spelljammer, had partly come to be to facilitate crossovers by connecting the various campaign settings — or, to put it another way, to render Die, Vecna, Die style campaign-setting crossovers into ordinary crossovers. On the other hand, Ravenloft was supposed to have a rather one-way connection to the rest of the multiverse (things could enter, but they couldn't leave), so something coming out of Ravenloft to have a crossover was rather unexpected...
• Paranoia had one of these with Cyberpunk in 1989 with the adventure Alice Through the Mirrorshades. In true Paranoia fashion, every aspect of Cyberpunk was given a thorough mocking, from its gritty near-future setting to its "style over substance" ethos to creator Mike Pondsmith himself.
• Phil Masters's Mage: The Ascension setting Mage 2069: No Strings Attached, in which the Traditions destroyed The Computer and took control of the internet in 2025, and the Technocracy responded by downplaying the very idea of computers from the Consensus. By 2069 the Technocracy has won ... only the Void Engineers are still finding Umbrood in near space and the oceans. And the remains of the Sons of Ether keep creating mega-projects that Go Horribly Wrong, requiring an international rescue team of Iteration X agents to sort things out. And then there turns out to be something completely inimical to the Consensus on Mars. So the NWO - having long almost entirely abandoned the M.I.B. look - send their brightly-uniformed agents from a flying base to investigate. Astral Is Green...
• On a not-very-similar note, Pyramid magazine once described a Mage: The Ascension scenario where a bunch of mages start using vulgar magic in the wake of a space station exploding, the Technocracy leaps on the "scientific" explanation secretly fed to them by the Traditions without noticing it opens cracks in the Consensus that would allow Sleepers to start manifesting "superpowers", and the next thing anyone knows, it's the Aberrant universe.
• Inferno - Dante's guide to Hell is Dante's Inferno as a Dungeons & Dragons 5E setting.
• In Sentinels of the Multiverse NightMist, AKA Faye Diamond, is the granddaughter of Joe Diamond, one of the characters in Arkham Horror. One of Arkham's creators designed both NightMist and her nemesis, Gloomweaver.

Theme Parks

• A staple of the Disney Theme Parks. There exist many videos of characters interacting if they appear in the same land - such as Mary Poppins and Bert and Cruella DeVille appearing together on Main Street, or Peter Pan and Alice among others in Fantasyland.
  • Fantasmic! has many of the Disney Villains team up to take down Mickey.
  • The Great Movie Ride at Disney's Hollywood Studios had both The Man With No Name and Ethan Edwards together in one scene.
  • The Redwood Creek Challenge Trail in Disney California Adventure has references to the events of Brother Bear, and shows featuring Russell and Dug and Pocahontas.
• Universal Studios also has had some attractions featuring this.
  • Beetlejuice's Graveyard Revue has the title character meeting the Universal Classic Monsters.
  • The pre-show for Kung Fu Panda Adventure shows Po interacting with Shrek, Donkey, Gingy, Marty, and Princess Poppy Since said attraction is set inside the DreamWorks theatre which itself is interchangeable to feature attractions based on other DreamWorks films/franchises.
  • The former StreetBusters show had the Ghostbusters battling against Betelgeuse.
• Between 2008 and 2009 in Japan, Blue from Nickelodeon's Blue's Clues starred alongside Hello Kitty in a live stage show called "Blue's Clues Show" in Sanrio Puroland. Blue was also spotted wandering around Puroland and seen interacting with other Sanrio characters.

Toys

• Matt Trakker of M.A.S.K. re-emerged as an action figure in the G.I. Joe line, presumably because Kenner (M.A.S.K.'s manufacturer) merged with Hasbro (G.I. Joe's manufacturer) years ago.
  • SQUUEEEEEEEEEE-- Oh, excuse me!
  • G.I.Joe's original intercontinuity crossover character, WWF wrestler Sgt. Slaughter.
  • Hasbro has also done G.I. Joe action figures for Rocky Balboa and William "The Refrigerator" Perry as team trainers. The Rocky figure was canceled, however, when another company picked up the toy license for Rambo before Hasbro could finalize the likeness rights for Sylvester Stallone.
  • And also G.I. Joe action figures for Street Fighter II. In fact, it was there when Ken got his last name, Masters, because they couldn't name an action figure just "Ken" thanks to Barbie.
  • G.I. Joe and Transformers cross over in an unreleased Transformers: Generation 2 era transforming G.I. Joe Armored Personnel Carrier, an unreleased Baroness & Ravage statue, and the G.I. Joe and the Transformers San Diego Comic-Con and Collector's Club exclusives, including the reappearance of Old Snake. The Transformers: Generations Combiner Wars Decepticon Viper transforms into a Cobra Rattler jet and has a combined Cobra/Decepticon insignia.
  • In Action Force #17, "Meditations in Red", Marvel hero and occasional Avenger Shang-Chi is revealed to have trained Quick Kick of Action Force, Lee Ho Ito, a different character than MacArthur S. Ito, Quick Kick of G.I. Joe. Action Force and Transformers UK cross over in "Ancient Relics!", and archaeologist Susan Hoffman appears in two later Transformers UK stories.
• For a few years, Hasbro had a Transformers sub-line called Transformers Crossovers, including Star Wars and Marvel Comics characters. They are presented as the characters driving vehicles that transform into Humongous Mecha that look like they do, ranging from a Hulkbot turning into a tank to a moon-sized Darth Vader robot transforming to the Death Star. The Star Wars ones have an advantage in that they can use existing vehicles to turn into. The Marvel ones don't have existing vehicles (for the most part... but then again, try remembering the last time you saw Spider-Man's Spider-Mobile), but this is an advantage in its own way as they can be designed almost entirely around making the robot mode look right.
  • Before even those toys came along there was the Animorphs Transformers line, which unfortunately didn't do well, mainly due to Kibbles and Bits hitting the line hard; it also was tying in with the equally bad TV series at the time.
  • There's also the Disney Label ones, including "Mickey Prime" and a Bumblebee Donald Duck. Doesn't seem like these Disney crossovers will be coming to the US, though.
• Teenage Mutant Ninja Turtles have had the Turtles as Troll dolls◊, Universal Studios monsters, and Starfleet officers◊ from Star Trek: The Original Series (the latter due to Playmates holding both franchise licenses).
• Sanrio once did a crossover with Care Bears in early 2014 in Japan called "Little Twin Stars X Care Bears".◊ Complete with its own exhibit and exclusive Care Bears and Little Twin Stars merchandise.◊

Video Games

• Lost Crusade has the appearance of characters from Lord of Vermillion III.
• The Battle Cats has featured characters from Annihilation City, Dragon League A/Dragon League X, Dragon Poker, Merc Storia, Princess Punt Sweets/Princess Punt 2, Survive! Mola Mola!, Monster Hunter, Million Arthur, Mr.Ninja!! Fever, Metal Slug Defense, and Yakuza Apocalypse.
• Brave Frontier has featured characters from Chain Chronicle, Deemo, Emperor's SaGa, The King of Fighters, Phantom of the Kill, Puzzle Trooper, Shin Megami Tensei IV: Apocalypse, Tales of Link, Terra Battle, Thousand Memories, and Vocaloid.
• Bravely Archive D's Report and Little Noah crossed over.
• Garry's Mod allows you to do all kinds of crossovers with the right mods. Want John-117 to team up with Gordon Freeman and fight Saren? Have fun.
• Mario and Sonic at the Olympic Games featured the first meeting of Mario and Sonic the Hedgehog. Since the pair were the mascots of former warring console makers Nintendo and Sega (respectively), this was something of a big deal for old-school gamers.
• Cadence of Hyrule is an indie game that combines the roguelike/Rhythm Game mashup Crypt Of The Necrodancer with The Legend of Zelda franchise.
• Phantom of the Kill has featured characters from Brave Frontier as well as Puella Magi Madoka Magica.
• Puzzle & Dragons has featured characters from Angry Birds, Batman, The DCU, Dragon Ball Z, Dragon's Dogma, Clash of Clans, Crystal Defenders, Final Fantasy, Emil Chronicle Online, Fist of the North Star, GROOVE COASTER, Gunma no Yabou, Hello Kitty, Hunter × Hunter, Monster Hunter, Neon Genesis Evangelion, Princess Punt, Ragnarok Odyssey ACE, Ragnarok Online, Saint Seiya, Taiko no Tatsujin, and more.
• Super Smash Bros., which features dozens of prominent first- and second-party Nintendo characters fighting, from Mario, to Link, to various Pokémon, plus (from Brawl onwards) numerous third party franchises like Sonic the Hedgehog, Metal Gear, Mega Man, Pac-Man, Street Fighter, Final Fantasy, Bayonetta, Castlevania, Persona, Dragon Quest, Banjo-Kazooie, Fatal Fury, Minecraft, Tekken, and Kingdom Hearts. If you also count Assist Trophies, Spirits, and Mii Costumes, there's Bomberman, Doom, Shovel Knight, Virtua Fighter, Monster Hunter, Rayman, Shantae, Baten Kaitos, The King of Fighters, Samurai Shodown, Ganbare Goemon, Resident Evil, Assassin's Creed, Undertale, Kunio-kun, Cuphead, Fallout, World of Mana, Octopath Traveler, Bravely Default, Sakuna: Of Rice and Ruin, and No More Heroes.
• Mario Hoops 3-on-3 and Mario Sports Mix add Final Fantasy characters to the traditional cast of Mario sports games.
• The Fortune Street series eventually added Dragon Quest characters to the game. Sony installments of the series crossed them over with Final Fantasy characters, while the Wii and DS installments mixed them up with the Super Mario Bros. cast.
• Pepsiman crosses over with Fighting Vipers, which crosses over with Daytona USA, Rent A Hero, Sonic the Fighters, Virtua Cop, and Virtua Fighter, in Fighters Megamix.
• Two games by Shounen Jump were made that put up some of their high-end mascots up against each other in the same vein as Super Smash Bros. The most popular and most varied is the Jump Super Stars game on the Nintendo DS. On the Gamecube, focusing on its most successful series, is Battle Stadium DON, with DON being an acronym for Dragon Ball, One Piece, and Naruto.
• Wario Blast: Featuring Bomberman! which is what the title says. (Except in Japan, where it was GB Bomberman and had nothing to do with Wario.)
  • The ending of Bomberman for the NES had Bomberman turning into the player character from Hudson Soft's NES version of Lode Runner.
• The Gilliam Yaeger who is the final boss of the Super Famicom game Hero Senki, and who appears in the Super Robot Wars initial continuity, and the Original Generation continuity are all the same character.
  • For that matter, the Super Robot Wars series itself is built on the idea of Mazinger Z and Shinji Ikari teaming up to beat up Char Aznable.
  • Also notable in Super Robot Wars OG Saga: Endless Frontier, Reji and Xiaomu from Namco × Capcom confirm that KOS-MOS from Xenosaga comes from their future (which was already established in the former's game).
• Mortal Kombat:
  • Mortal Kombat vs. DC Universe, the title of which is pretty self-explanatory.
  • DLC for Mortal Kombat 9 pits the MK cast against Freddy Krueger. The PS3 version also had Kratos from God of War as a Guest Fighter.
  • Mortal Kombat X features Jason Voorhees, Leatherface, a Xenomorph, and a Predator as playable characters, though in a missed opportunity, Freddy is nowhere to be seen.
  • Among the DLC kombatants of Mortal Kombat 11 are Spawn, the T-800, RoboCop, and Rambo.
• Though it's technically one series, each of the Final Fantasy games has its own world and continuity, which means Gilgamesh's appearances in various games (it's hinted he's the same character, moving through the alternate universes) count.
  • And then there's Final Fantasy Tactics, where you can send out other characters on jobs, and they may return having found the Big Bad's palace from Final Fantasy II, or the phantom train from Final Fantasy VI, or the fake Excalibur from Final Fantasy V.
    • The sidequest to get Cloud in your party. The PSP port of Tactics also included Balthier from Final Fantasy XII and Luso from Final Fantasy Tactics A2. In the case of Cloud too, it's suggested that his stint in Ivalice occurs when he fell into the Lifestream, hinting that it's the actual Cloud from Final Fantasy VII. Less so with Balthier and Luso, who are more or less there with no explanation. Lampshaded by Balthier himself even, who mentions that his role in the game... "feels more like a cameo role."
• DJ Atomika, the (some would say) annoying announcer in Burnout Paradise, is the same guy who provided the commentary for SSX 3. In Paradise, he makes reference to SSX several times, suggesting it's supposed to be the same character.
• A couple of Yes! Pretty Cure 5GoGo! video games have incorporated characters from the previous universes. The story implications of the iDOLM@STER knockoff are probably not significant, but the DS game has a plot suggesting they all share a universe and simply never ran into each other before (which does happen in the Pretty Cure All Stars DX movie).
• Super Puzzle Fighter II Turbo has characters from Street Fighter, Darkstalkers, and Cyberbots. There's only one character from the latter, though.
• Likewise, Super Gem Fighter was primarily a Street Fighter game, but also featured Morrigan, Hsien-Ko and Felicia from Darkstalkers and Tessa from Red Earth.
• Capcom's "Vs. series" started life as such with X-Men vs. Street Fighter and Marvel Super Heroes vs. Street Fighter before stepping into Massive Multiplayer Crossover territory; it hasn't looked back since. Capcom does a lot of crossovers within its properties as well. Mega Man Battle Network with Boktai. Metal Gear Solid: Peace Walker with Monster Hunter. Professor Layton vs. Phoenix Wright: Ace Attorney. And so on.
• Shin Megami Tensei III: Nocturne features a guest appearance by Dante from the Devil May Cry series. In exchange for this being done, the SMT series' character and demon artist Kazuma Kaneko (who's also a fan of the DMC series) designed the Devil Trigger forms of the Sons of Sparda in Devil May Cry 3: Dante's Awakening. The latter game also listed Kazuma Kaneko as a "Special Guest" in its credits.
• One of the boons from finishing an Escape Velocity: Nova storyline is access to one of two known (very expensive) ships "found floating near a wormhole at the farthest end of known space". Scientists "theorize that these mystery ships somehow entered our galaxy from a parallel dimension." The ship is from the original Escape Velocity game, which has practically identical (albeit less developed) gameplay but a completely different universe.
• One of the earliest intercompany video game crossovers was Battletoads & Double Dragon: The Ultimate Team, a crossover between Rare's Battletoads and Technos Japan's Double Dragon franchises (natch) released in 1993 for various platforms. This was made possible by the fact that Tradewest published both series in America and Europe, although the game itself was really more of a Battletoads game with Double Dragon characters as guest stars (some which were misnamed in the game).
• Kingdom Hearts is a crossover between Disney and Final Fantasy.
  • "Disney" seems a bit unspecific, but that's because it's pretty much everything Disney owns.
  • As of Dream Drop Distance, characters from The World Ends with You have started showing up, so now it's "anything Disney and potentially anything Square Enix owns."
• My World, My Way features two characters, the mysterious dungeon diggers Owen and Kate, who were the protagonists of a previous Atlus/Global A game entitled Master of the Monster Lair. Owen even carries around the magic shovel that he had in Monster Lair, and the dungeon layouts are similar in both games.
• So far, Link, Heihachi, Spawn, Lloyd Irving, Darth Vader, Yoda, Starkiller, Kratos, Ezio Auditore, Geralt of Rivia, 2B, and Haohmaru have all appeared in the Soul series. Soulcalibur III is currently the only installment to outright lack a Guest Fighter since their introduction in SCII (though there are "Type X" parts in Create-a-Soul that give female custom characters the appearance of KOS-MOS), and the first Calibur arguably laid the groundwork by featuring its own incarnation of Yoshimitsu.
• Poker Night at the Inventory features Tycho Brahe, Max, Heavy Weapons Guy, and Strong Bad, from Penny Arcade, Sam & Max: Freelance Police, Team Fortress 2, and Homestar Runner, respectively, all playing poker together, plus an assortment of characters milling around the background.
  • The sequel continues this, crossing Sam & Max: Freelance Police again (Sam this time, though Max still hangs around), The Venture Brothers (Brock Samson), Army of Darkness (Ash), Borderlands (Claptrap), and Portal (GLaDOS).
• Although it's all from the same company, this schtick is a favorite of Nippon Ichi. Characters tend to show up in each other's games with reckless abandon, ranging from minor cameos to secret characters to actual plot-relevance. Laharl ends up in a bottle in Phantom Brave and chews out Revya in Soul Nomad & the World Eaters for trying to take his title. Etna is a central secondary character in Disgaea 2. Lujei (from GrimGrimoire) is responsible for Endorph (who is really Walnut from Phantom Brave) appearing in Soul Nomad. Everyone of any importance shows up in Disgaea 3 as downloadable content. And to top it off, you have Asagi, the wandering protagonist without a game of her own, trying to usurp the hero role in almost every game.
• Devil May Cry:
  • Interesting crossover here, in the first game. Dante receives the sword named Alastor, imbued with an electrical motif. Later on in Viewtiful Joe, a character named Alastor appears, complete with the electrical motif and use of the exact same sword. (Multiple copies of it, in fact.) The connection is later made in the PS2 port of Viewtiful Joe in which Dante guest stars and Alastor (revealed to be the spirit of Dante's sword) harbors some unfriendly feelings towards Dante (for leaving him behind in Devil May Cry 2).
  • After this, the connection is pushed forward in Tatsunoko vs. Capcom: Morrigan's win quote vs. Viewtiful Joe mentions that she was disappointed in him after talking to Alastor, leading to an implication that Darkstalkers, Devil May Cry, and Viewtiful Joe are all part of the same universe.
  • Done again in Marvel vs. Capcom 3, where Dante and Joe's unique intro quotes for each other show the two to be friendly acquaintances. This would be odd, as Dante never actually ran into Joe in his Viewtiful Joe story, but he was playable in the PSP version of Viewtiful Joe: Red Hot Rumble.
    • Though non-canon, it should also be noted that Dante's story in Viewtiful Joe features Mundus, the Big Bad of DMC1, as the force behind Captain Blue's fall to villainy.
  • Bayonetta, another Hideki Kamiya creation, drops numerous hints that it exists in the same world as Devil May Cry. This is particularly done through the use of Enzo, who has the same name and personality traits of an information broker who was pals with Dante and mentioned as early as the instruction manual for Devil May Cry, but the lore for one of the unlockable accessories, the Bracelet of Time (which is visually similar and functionally identical to the Bangle of Time from DMC1 ^note with a small remainder of the design borrowed from the V-Watch in Viewtiful Joe), notes that it was created by Eva (Dante's Missing Mom), "a truly extraordinary [Umbra] witch" who "entered into contract with a legendary dark knight" (i.e. her husband Sparda). Additionally, Luka's father is a world-famous journalist well versed in the supernatural who goes by the name Antonio Redgrave. Dante's preferred alias in the DMC1 novel and The Animated Series? Tony Redgrave. When asked about the connection, Kamiya answered on his Twitter account that Dante respected Antonio and his work, so took the name during his early days as a demon hunter. Luka also name drops Claire, Trish, Silvia, and Ammy as girls he's dated in the past, but that's presumably a fun little nod to Kamiya's past works.
• Free Flash game crossover: In Shift 3 you can unlock Fancy Pants Man as a Secret Character.
• Metal Gear Solid 3: Snake Eater featured a bonus minigame where Solid Snake is assigned capture a bunch of escaped monkeys from the Ape Escape series. In turn, Ape Escape 3 featured a bonus mini-game where the player controls a monkey named Pipo Snake who must rescue Solid Snake.
• Via "Fall of the Space Core, Volume 1", a mod collaboration for The Elder Scrolls V: Skyrim between Valve and Bethesda, the Space Core from Portal 2 crash-lands near Whiterun and gets picked up by the Dovahkiin. No word on where Wheatley ended up.
  • Or as Valve put it, a patch to put Nolan North in Skyrim.
• Pokémon Conquest is this. It's Pokémon combined with the Nobunaga's Ambition franchise.
• PowerWash Simulator is having a crossover with Warhammer 40,000 in February 27, 2024. Purge the unclean as you are an Adeptus Mechanicus priest hosing down dirty Imperial warmachines.
• Reality-On-The-Norm, a Shared Universe Round Robin series, has had some games about character from other games entering the city of Reality, such as Commander Keen or Monty Mole. Then there's Shadows of RON, whose developer actually included the character from his own book series as the protagonist.
• More interesting hints at Capcom's IPs existing in the same universe: in the first Dino Crisis, certain crates can been seen sporting the Umbrella Corporation logo. The game's setting (the Borginian Republic) in reused in the Ace Attorney series (as the Republic of Borginia). The fifth stage of Dino Stalker also shows an abandoned Umbrella building and the "Woman Drawing Water" statue from the Spencer Mansion as Easter Eggs. And speaking of Resident Evil, many RE4 players remember a dog in a bear trap encountered early in the game that, if rescued, will come to your aid during the El Gigante boss fight. That dog is Hewie of fellow Capcom horror title Haunting Ground. Additionally, Tricell's emblem can be seen on billboards in Ascension City from Bionic Commando (2009). Throw in the explicit fact that Street Fighter, Final Fight, Saturday Night Slam Masters, Captain Commando, and Rival Schools are part of a singular timeline (with Street Fighter V further implying Guy's master Zeku goes on to found the Strider organization), some possible inter-series cameos in Ken's Street Fighter Alpha 2 stage (such as Linn Kurosawa, who later showed up in Ryu's Street Fighter III stage as well), and the suggestion from Namco × Capcom, Project × Zone, and Project X Zone 2 that the various series are part of one greater world merely separated by time and space, and the implication is that these series all share some degree of cohesive continuity but Capcom doesn't really bother to go further in-depth outside of the Vs. series (and sometimes not even then).
• Soul Hunters has the appearance of Ezio from Assassin's Creed.
• This is the entire premise of Warriors Orochi, being a crossover between Samurai Warriors and Dynasty Warriors. Though that hasn't stopped them from adding guests from other titles, including Dead or Alive, Ninja Gaiden and even Soulcalibur.
• The sequel to Transformers: Fall of Cybertron, Rise of the Dark Spark, crosses over the War for Cybertron universe with Michael Bay's live-action universe, during the events of Transformers: Age of Extinction.
• Iron Man and X-O Manowar in Heavy Metal featured the two heroes teaming up, being one of the few video games to feature a crossover between two comic book characters from different publishers.
• According to Word of God, Wonder-Cheerleader from The Wonderful 101 and Sexy Silvia from Viewtiful Joe are one and the same. Joe himself is even mentioned by name if Wonder-Pink should fail one of her QTEs, referring to the third game in the Viewtiful Joe trilogy that was never made.
• Bayonetta 2 was published by Nintendo, with the result (other than the game being a Wii U exclusive) being that plenty of references to other Nintendo games were thrown in. One of them is a Chain Chomp that can be wielded as a flail-style weapon after being unlocked.
• Senran Kagura: Estival Versus had Ikki Tousen characters appear via DLC.
  • Meanwhile, Senran Kagura: New Wave has crossed over with Drawgirls and UPPERS.
  • And Senran Kagura Peach Beach Splash has, of all people, Neptune as a DLC character.
• Taiko no Tatsujin has characters from other video game franchises appear as Guest Fighters in Dokodon! Mystery Adventure's RPG mode. Bet you never thought you'd see Kirby, Phoenix Wright, and Reimu Hakurei join forces, did you?
• Animal Crossing has had many references to Super Mario Bros., The Legend of Zelda, and a few other first-party Nintendo series, but the Welcome amiibo update to New Leaf really takes the cake with the new villagers you can invite with the appropriate amiibo. The update has characters based on four series:
  • The Legend of Zelda: Epona the peppy horse, Ganon the cranky pig, Medli the normal bird, and W.Link the smug wolf.
  • Splatoon: Cece and Viché (normal and peppy squirrels who cosplay as Callie and Marie) and Inkwell the jock Octopus.
  • Sanrio: Six characters that are inspired by Sanrio's various properties which include: Rilla the peppy Gorilla with a Hello Kitty theme, Chelsea the normal deer with a My Melody theme, Toby the smug rabbit with a Keroppi theme, Chai the peppy elephant with a Cinnamoroll theme, Marty the lazy cub with a Pompompurin theme, and Etoilie the normal sheep with a Little Twin Stars theme.
  • And finally there's Felyne, a lazy cat who is a reference to the Felyne from Monster Hunter.
• BlazBlue: Cross Tag Battle brings together four different properties: Arc System Works' BlazBlue, Atlus' Persona 4: Arena, French Bread's Under Night In-Birth... and, to the surprise of everyone, Monty Oum and Rooster Teeth's RWBY, thanks to BlazBlue producer Toshimichi Mori being a fan of the show and wanting to develop a game based off of it. Season 2 saw three more series cross over: Arcana Heart, Senran Kagura, and Akatsuki Blitzkampf.
• The Kemono Friends mobile game Kemono Friends 3 had a crossover with the Osamu Tezuka character Unico on February 18th, 2021◊ with a Little Bit Beastly version of the titular character. Unico's design◊ in Kemono Friends 3 is just as adorable as his original manga design and feature film series. Tezuka Productions even made an official humanized drawing of Unico◊ not long after the collaboration was announced. The crossover was also announced during the 40th Anniversary of the release of The Fantastic Adventures of Unico in Japan.

Web Animation

• How It Should Have Ended gives their take on how the Terminator series should end. With an unexpected crossover.
• Dead Fantasy, a Machinima series which pits Dead or Alive heroines and Final Fantasy heroines against each other. And it is glorious.
• DEATH BATTLE!: The premise is normally to have two similar characters from different series fight to the death (really, analysed to death) to see who would win, so nearly every episode is a different crossover.

Webcomics

• The Crossoverlord. (Yes, that's the name of the comic and the no space is intentional.) Now has a sequel called Crossoverkill.
• Unwinder of Unwinder's Tall Comics adopted Marmaduke. Then, in the Watchmen parody comic, the big dog dies à la Jon Osterman. According to the author, "It's not Tall Comics canon, but it IS Marmaduke canon."
• In a guest strip for PvP, Kris Straub proposed that his comic Starslip takes place in the same universe, just thousands of years later, and his characters are descendants of those in PvP. Scott Kurtz said it's canon, though maybe he was joking.
  • Another guest strip by Bill Amend had Jason taking over 'PvP while Cole was away. Scott claimed that it was canon.
• Cross Time Cafe: Characters from at least five different webcomics are regular cast members - though half the cast appears more here than in their own comics (the main exceptions being Florence, Jack and Jenny.
• Something*Positive is practically some sort of Massive Multiplayer Crossover nexus of webcomics. (See that article for more.)
• The Cartoon Chronicles Of Conroy Cat has the story take place in Cartoon Land, and has cartoon characters from different series making appearances.''
• Powerpuff Girls Doujinshi starts with The Powerpuff Girls and Dexter's Laboratory, but also brings in Justice League, Men in Black, Megas XLR...and pretty much any other series that catches Bleedman's fancy.
  • Likewise with Grim Tales from Down Below, which has even more crossovers, such as The Grim Adventures of Billy & Mandy, Danny Phantom, The Nightmare Before Christmas, Spawn, etc. Yes, Bleedman just really likes doing these.
• A storyline running through both Kevin & Kell and General Protection Fault had Nick and Ki "crossing over" to Domain.
• Hello Cthulhu
• Heroes Unite and Heroes Alliance share a common superhero setting called the HU-verse. Many of its characters also exist in their own titles with their own separate continuity. A recent example is Bones, who appears in the HU-verse despite his own series taking place on a post-apocalyptic Earth. Dasien has also appeared in Heroes Unite despite coming from her own incompatible superhero setting.
• In 2022, a new, Web-only story by John Allison, the author of Giant Days, combined the setting of that comic with that of Batman (specifically, Allison says, that of All-Star Batman) in a completely unauthorised fashion. Given that Esther, one of the lead Giant Days characters, was once, long ago, revealed to wear Batman underwear, but doesn’t know of him in this story, it’s unlikely that Giant Days was previously meant to take place in Batman's universe.
• Goblins: The sub-comic Tempts Fate has the eponymous goblin fighting a Predator. And no, not a Predator Pastiche — despite the title comic being "Tempts Fate vs. the Predatory Alien Creature Which Is Legally Distinct from Some Other Kind of Predator".
• Guilded Age: The likenesses of the characters from Hijinks Ensue show up in chapter 9.
• Mr. Boop: Originally seemingly limited to characters from western animation, over time characters have been introduced from anime, newspaper comics, video games, and even other webcomics.
• Transformers Legends is a Japanese webcomic featured on the official Takara Tomy website to promote the Transformers Legends toyline, which features appearances by characters from the Generation 1 cartoon, Kiss Players, Transformers: ★Headmasters, Transformers: Super-God Masterforce, Transformers Victory, Beast Wars, Beast Wars II, Beast Wars Neo, Car Robots, the Unicron Trilogy, Transformers: Animated, Transformers: Prime and Transformers Adventure.

Web Original

• For the Webcomics equivalent of the TV crossover list, see the Webcomic Crossover & Cameo Archive.

Web Videos

• Star Wreck: In the Pirkinning, a Finnish Babylon 5/Star Trek crossover movie that took seven years to make. So good, it's apparently the most-watched Finnish film, and Universal Studios are distributing an updated version.
• I'm a Marvel... And I'm a DC has Marvel and DC characters (and occasionally characters from other continuities, such as Hellboy) arguing with each other about whose comics and movies are best. Then there's the "After Hours" series which has actual storylines involving characters from both continuities, in the same vein as the official Marvel/DC crossovers.
• Dragon Ball Abridged:
  • Ghost Nappa has been in a duel and Atlantis.
  • And seeing as he had a Poke Ball prior to his death, perhaps he also, at some point, visited another continuity.
  • He's also been spotted in Death City.
  • Since announcing the #CellGames presented by HETAP, Perfect Cell has been challenged by Yusuke Urameshi, Yami Yugi, Ken and Ryu, Sonic and Knuckles, Kenshiro, Light Yagami, and Saitama and Genos.
• Code MENT and None Piece cross over in episode 14.5/6. It's even more incoherent than usual.
• Sam & Mickey have Barbie interact with whatever other toys they can get their hands on, such as Mrs. Potato Head, Disney Princesses, and The Hunger Games dolls.
• In 2020, The Irate Gamer did a crossover with The Angry Video Game Nerd to review the Dick Tracy spinoff game.

Western Animation

• Cartoon Network:
  • The entire CN City era of on-air branding during the mid-2000s was based on this idea, with the characters of various Cartoon Network series (both originals and acquisitions) interacting within a metropolis compromised of elements from their various shows. In fact, most of the network's branding up until the 2010s had this in spades.
  • According to the special The Grim Adventures of the Kids Next Door, The Grim Adventures of Billy & Mandy, Codename: Kids Next Door, Ed, Edd n Eddy, and The Powerpuff Girls all take place in the same universe.
  • Since Dexter, Boy Genius has been sighted in Townsville, we can add his show to this list as well. Several superheroes, like Major Glory and Val Hallen, have also appeared in Powerpuff Girls episode "Members Only"; which also features Crossover Cameos of Space Ghost and Birdman. And same for Blue Falcon and Dynomutt.
  • The Cartoon Network Invaded! crossover event followed an alien invasion that spanned episodes of Foster's Home for Imaginary Friends, Ed, Edd n Eddy, My Gym Partner's a Monkey, Camp Lazlo, and The Grim Adventures of Billy & Mandy, the latter series suggesting that certain characters from each series were in fact alien undercover agents.^note For those who are curious, the double agents are Cheese, Harold, Rick Platypus, Plank, and Puddin.
  • TTG vs. PPG was a half-hour special crossing The Powerpuff Girls (2016) with Teen Titans Go!, kickstarted by Mojo Jojo teleporting himself to Jump City.
  • Ace from The Powerpuff Girls became a member of the band Gorillaz during Stage 5. The band was also referenced as existing much earlier◊ during The Powerpuff Girls Movie.
  • The episode "Say Uncle" had Uncle Grandpa crossover into the universe of Steven Universe, with a cheerful note that these events wouldn't be canon. The episode ends with Uncle Grandpa consulting a checklist of other Cartoon Network shows he's visited, including SWAT Kats.
  • The OK K.O.! Let's Be Heroes episode "Crossover Nexus" had K.O. meet up with Ben 10, Garnet, and Raven. The episode notably includes cameos from almost every single CN original series, with the only two that didn't appear failing to do so due to time constraints.
• Transformers and G.I. Joe have a long history of crossovers, which includes Inhumanoids and Jem through the shared character of sensationalist TV reporter Hector Ramirez (a Geraldo Rivera parody). The original comic books had a special crossover miniseries, and recent comics have revisited the crossover in various ways. The eighties cartoons, meanwhile, shared a reality: in the futuristic third season of Transformers, major character Marissa Faireborn was the daughter of G.I. Joe character Flint, and one episode featured a washed-up Cobra Commander doing business under the pseudonym "Old Snake." Inhumanoids also implied that one member of the Earth Corps, Sabre Jet, was previously Ace of G.I. Joe (both of them had the name Brad J. Armbruster).
• Nickelodeon's shows The Fairly OddParents! and The Adventures of Jimmy Neutron, Boy Genius had three cross-over Made-for-TV Movies: "The Jimmy Timmy Power Hour", "Jimmy-Timmy II: When Nerds Collide", and "Jimmy-Timmy III: Jerkinators". Also Rugrats Go Wild!
• Disney Channel took this to another extreme with Lilo & Stitch: The Series, doing several specials that crossed it over with a bunch of the other shows on Disney Channel. This fits with the movie's initial marketing push, showing Stitch crossing over with various Disney movies, wrecking the place, and being told to get his own movie.
  • And, as a result, aliens are now Canon in Recess and The Proud Family... Which seems kinda odd, considering how relatively realistic their premises were. Though it does somewhat fit with The Proud Family's usual weirdness. Penny's great-aunt canonically has telekinetic powers and the movie was pretty wacky.
    • With Recess however, one episode has a story where a kid was believed to have been abducted by aliens. At the end of that episode, the aliens return him to school, and is worried he's late.
  • And the fact that, by extension, American Dragon: Jake Long is set in the same universe as Lilo & Stitch, Kim Possible, and Recess has lots of strange implications...
    • It has definitely affected Lilo & Stitch, as later spin-offs show that the franchise takes place in a Science Fantasy universe instead of a mere children's sci-fi one.
  • It's very confusing with Recess, as it's made explicitly clear in the series that it takes place over the course of the Fall of 1997 until the Summer of 1998 (and then Fall 1998 for Recess: Taking the Fifth Grade), even for the episodes made in the 2000s (this is firmly established in Recess: School's Out)
• In another, but separate, Disney animation example, one episode of Hercules: The Animated Series crossed over with Aladdin: The Series. The plot involved Jafar being sent to Hades following his death in Aladdin: The Return of Jafar, and Hades using his powers as God of the Dead to bring him back so they could both compete to defeat Aladdin and Hercules.
• Duck Dodgers:
  • In the episode "The Green Loontern", Dodgers gets his dry cleaning mixed up with Hal Jordan's and ends up as the newest Green Lantern when he finds the power ring in Jordan's uniform pocket.
  • In the episode "Samurai Quack", Dodgers takes the place of Samurai Jack. Complete with Achoo, voiced by Mako himself.
• The Simpsons:
  • Homer's claim to having had a close encounter with an extraterrestrial is investigated by none other than Agents Scully and Mulder. The Agents asked if any of the following aliens are familiar: Marvin the Martian, ALF, Chewbacca, and Gort. Writer Mike Reiss described it as the "most illegal shot" in the show's history.
  • In a move which infamously pissed off Groening, Jay Sherman from The Critic comes to help judge a film festival. An episode made after The Critic was canceled has Jay turn up again, this time confined to an insane asylum and only able to say his catchphrase, "It stinks!".
  • Rick and Morty would later be in a Couch Gag in which they accidentally kill the family and have to remake them using Imported Alien Phlebotinum, only to create abominations with Rick's features due to Rick cleaning the tube containing their DNA with his own spit.
• Greg Weisman has written a Gargoyles/ Spectacular Spider-Man crossover radio play, although it is unofficial and non-canon.
  • There were also plans to do a crossover when it seemed there would be a series version of Atlantis: The Lost Empire, called Team Atlantis. Set in the '20's, it would have involved the Atlantis cast getting involved in a battle between Demona and a former Hunter.
  • However, that hunter has reappeared in the comics, and Demona was seen grabbing something out of the remains of the Praying Gargoyle an Atlantean crystal.
• In an ad for Metalocalypse, Eddie Riggs apparently served a stint as a roadie for Dethklok. In another ad, the band summons the Horseman Death directly from his game. He grants them a wish for pizza.
• The Mask and Ace Ventura: Pet Detective met for two episodes, each one allocated in the second season finale of one of the series. Both shows kept their respective styles of animation in each other's universe (Ace and Spike, for example, kept their more cartoony look in the Mask's more realistic world and vice versa).
• Due to both characters being from Man of Action Studios to begin with, Generator Rex had a special episode named Ben 10/Generator Rex: Heroes United, involving Rex meeting Ben Tennyson (the Ultimate Alien incarnation). A rare canon example, as it reveals more about Rex's backstory and provided Ben with a new alien form that actually made it to the next sequel series. The Secret Saturdays also appear in Ben 10 Omniverse. And a younger Generator Rex crosses over to the universe of Ben 10 (2016).
• Freakazoid! gave us this little scene. Also, the Warners had a brief cameo in the segment "Freakazoid And Friends".
• WWE superstars have found some interesting tag team partners from Hanna-Barbera.
  • Scooby-Doo! WrestleMania Mystery: While Scooby and the gang have teamed up with celebrities before, this is the first time Kane has chokeslammed Shaggy. This would later be followed by Scooby-Doo! and the WWE: Curse of the Speed Demon, which focuses more on racing than wrestling.
  • In The Flintstones: Stone Age SmackDown!, The Flintstones meet several stone-age parodies of WWE personalities, all of whom voice their own characters.
  • In The Jetsons & WWE: Robo-WrestleMania!, they team up with The Jetsons to stop Big Show from ruling the future (yes, seriously), causing Vince McMahon to ask "Would you believe this isn't the first time I've met a talking dog?"
• Mystery Incorporated also makes an appearance in the Supernatural Season 13 episode "Scoobynatural" when Sam, Dean, and Castiel get sucked into a cursed TV.
• Captain Laserhawk: A Blood Dragon Remix acts as this for various Ubisoft IP. The trailer presents elements from Assassin's Creed, Watch_Dogs, and Raving Rabbids in a neon-lit world inspired by Far Cry 3: Blood Dragon.

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