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{{trope}}
[[File:doomvader-resized40percent.jpg|link=Rule of Cool|
{{quote|'''Jigsaw:''' [[Hannibal Lecture|You wallow in hypocrisy, Angus]]. [["The Reason You Suck" Speech|Your life has been dedicated to nonviolence, which you advance by jury-rigged poisons and explosives, pretending that using one form of violence over another makes you better than others]]... Well, now it is time to see how far you're -- did you just turn your manacles into laser beams?
'''MacGyver:''' Yep.
'''Jigsaw:''' ...[[Oh Crap|Crap]].
|Hypothetical ''[[MacGyver]]''-''[[Saw]]'' crossover. ([https://metaquotes.livejournal.com/6295553.html Source]) }}
Having a [[Crossover]] between two related shows is one
But what happens when [[The View
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 cute 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 [[
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 [[Fantasy Kitchen Sink|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, [[Reed Richards Is Useless]].
For more information and examples, see [http://www.poobala.com/crossoverlist.html 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
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, we might reasonably conclude that the whole of television is [[All Just a Dream]]. In the words of [[Dwayne McDuffie]], one of the executive producers of ''[[Justice League (
For the [[Web Comic]] equivalent of the TV crossover list, see the [http://crossovers.dragoneers.com/ Webcomic Crossover & Cameo Archive].
For a [[
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]].
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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]]. See also [[Vegas Crossover]], [[Folgers Crossover]], [[Transplant]], [[Fully
{{examples
== [[Anime]] and [[Manga]] ==
* 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.
** 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 ''[[
* Apparently mostly because the author of ''[[
** That the author of ''[[
* The ''[[Fate/stay
* And then there's the ''[[
** This was because the anime adaptations of both series were produced by [[TMS Entertainment]].
* ''[[
** 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 even Ryotsu of ''[[Kochikame]]'' made an appearance (as seen [http://www.youtube.com/watch?v=CYmzjou2LMU here]). They would later do this again only this time against Arlong and ''[[Astro Boy (
* ''[[
* Rodimus's backstory in ''[[
* To promote the [[Jump Super Stars]] game for the DS, a manga was included for those who preordered drawn by the people behind ''[[
* It's not much, but in ''[[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-GP01 Full Vernian, the Wing Gundam, RX-78-2, etc. They weren't kidding when the said they had all the Gundams!
== [[Comic Books]] ==
* [[Doctor Who
** And now there's [http://www.bleedingcool.com/2012/02/10/scoop-doctor-who-star-trek-official-crossover/ this]. [[And the Fandom Rejoiced|It's... beautiful.]]
* Beginning with ''[[Alien vs. Predator|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 ''[[
** Perhaps the most famous of these stories was ''[[Wild CATS]]/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, [[
** An interesting example: [http://30.media.tumblr.com/tumblr_lnacm5QoMK1qkz9yno1_500.jpg 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.
* Some comics by Roy Thomas saw a team-up between [[Robert E. Howard]]'s ''[[Conan the Barbarian]]'' and [[Michael Moorcock]]'s ''[[The Elric Saga|Elric of Melnibone]]''.
** On Elric's side this makes sense, as his home continuity is explicitly one of many parallel worlds.
* [[Judge Dredd (
** And in ''[[
* One of the single most bizarre
** ''[[Superdickery
**** ''
** The weird thing is that the Archie/Punisher crossover ''didn't suck.'' And there's not a single out-of character moment. The Archie EIC at the time admitted the comic came about from him meeting some Marvel guys at a cafe and talking.
* [[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''. Note that David also wrote an earlier Illyria-one-shot.
* Top Cow had an extended crossover with Marvel where the companies' characters live in different universes and which is probably in continuity, although several crossovers are pointedly not (like the one where Wolverine gets married to [[Witchblade (Comic Book)|Sara Pezzini]]), and a Darkness/Batman crossover which featured an important in-continuity event that affected the Darkness series itself, even though it couldn't possibly be in continuity.
* ''[[
* ''[[Mars Attacks!]] the [[Image]] Universe!'' Notable in that ''[[The 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.
* [[Godzilla]] once did battle with S.H.I.E.L.D, the ''[[Fantastic Four (Comic Book)|Fantastic Four]]'', ''[[The Avengers (Comic Book)|The Avengers]]'', ''[[
* [[
* When it was originally planned as a four-issue limited series, ''[[
** A recent company crossover between IDW and Marvel did have the Avengers and Autobots team up. It's considered ambiguously canon by IDW.
** They also, naturally, had crossovers with their ''[[
* The original Mirage ''[[
** Playmates' TMNT toy line even had a [[Usagi Yojimbo|Miyamoto Usagi]] action figure at one point.
** Not to mention Usagi's appearance in several episodes of both TMNT cartoons.
** They also showed up in ''[[Turtles Forever]]'', crossing over with both TMNT cartoons.
** Heck when [[Archie Comics]] had the license, [https://web.archive.org/web/20130908142454/http://thatguywiththeglasses.com/videolinks/linkara/at4w/21529-tmnt-meets-archie a crossover with the Riverdale gang was inevitable].
* The [[Fantastic Four (Comic Book)|Fantastic Four]] piloted [[
** To be accurate, this was when Marvel was publishing a ''Shogun Warriors'' comic book under license from Mattel, who released several Japanese [[Giant Robot]] toys under the banner. The Warriors were fully integrated members of the Marvel 616 universe.
* ''[[
* ''[[
* ''[[The League of Extraordinary Gentlemen]]'' series by [[Alan Moore]] runs off this
** 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'' #74 (October 1978) teams Spider-Man with [[Saturday Night Live
** In a similar vein, ''[[The Avengers (Comic Book)|The Avengers]]'' once appeared on ''[[David Letterman|Late Night With David Letterman]]''.
* [[Image]] and [[Valiant Comics]] came out with ''[[Death Mate]]'' in the 90s, but the less said about that the better.
* ''[[American Born Chinese]]'' has a subplot that crosses ''[[Journey to
* 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 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 (
* The ongoing (as of January 2011) [[Justice League of America|JLA]]/''[[
* ''[[Antarctic Press]]'' comics ''[[Gold Digger (Comic Book)|Gold Digger]]'' and ''[[Ninja High School]]'' have had frequent crossovers among their [[Loads and Loads of Characters|various characters.]]
* ''[[Star Trek:
** Asking yourself just ''how'' he became so powerful, aren't you? Answer: {{spoiler|[[Captured Super Entity|He's got ''Q'' trapped]]}}.
* And coming soon: ''[[Star Trek:
== [[Fan Works]] ==
* ''[http://alaxr274.deviantart.com/gallery/33810717 Super Milestone Wars]'' and its sequel, ''[http://alaxr274.deviantart.com/gallery/36864527 Super Milestone Wars 2]''
* ''[[Buffy the Vampire Slayer]]'' seems to be a bit of a crossover whore in fanfics. Crossovers include ''[[Halo (series)|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.
* The online [[Fan Film]] ''[[Haloid]]'', a truly impressive ''[[Halo (series)|Halo]]''/''[[Metroid]]'' crossover created by [[Monty Oum]]. Technically, also a {{spoiler|''[[Dead or Alive]]''}} crossover.
** The ongoing crossover series by the same author called ''[[Dead Fantasy]]'', consists primarily of stunt-laden over-the-top battles between characters from ''[[Dead or Alive]]'', ''[[Final Fantasy]]'', ''[[Ninja Gaiden]]'', and ''[[Kingdom Hearts]]''.
* Anything by [http://www.fanfiction.net/u/1044838/ Ten-faced Paladin] that isn't an [[Alternate Universe Fic]] is a crossover (sadly, a couple of them are [[Dead Fic]]).
* There is actually a rather good one between ''[[
* There's a ''[[
* ''[[The Princess Bride (
* The epic ''[[Star Wars]]''/''[[Star Trek]]'' crossover fic ''[https://web.archive.org/web/20120217205646/http://www.sfdebris.com/unity.asp 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.
* [http://www.furryconflict.com/ ''Trek Wars: The Furry Conflict''] not only has one of the worst names in fiction, but is also one of the best and [[Schedule Slip|longest running]] [[
* An early ''[[
* The fanfic ''[http://nsider.com/forums/index.php?showtopic=78378 The Chronicles of the Nine Kingdoms]''{{Dead link}} 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]]s -- ''[[Ranma
* ''[[
* An online fanfic crossover between ''[[Star Trek:
* There's been a few ''[[
** And Shirou EMIya (partial caps intentional) of [[Fate/stay
** Also, Jack in ''[http://www.fanfiction.net/s/6556173/1/Zeros_Shock Zero's Shock]'' and '''ALEX FREAKING MERCER''' in ''[http://forums.spacebattles.com/showthread.php?t=177288 Unfamiliar]''.
* There is an obscure [[The X-Files
* ''[[Nasuverse|TypeMoon]] vs. [[Godzilla]]''. [http://imiju.jp/Novel/GxTM00-0.htm Really]. It's a fanfic Novel that may be in Japanese, but the [http://www.clubdesmonstres.com/best/htm/moon_type.html art] created for it is enough to tantalize everyone.
* ''The Doctor and the Enterprise'', a Crossover [[Fanfic]] that predates the Internet, was eventually published with the ''[[Star Trek]]'' and ''[[
* The ''[[Sin City]]'' and ''[[
* A surprising number of ''[[Harry Potter (
* ''[[
* ''[http://www.fanfiction.net/s/5076954/3/Kitsune_on_Campus Kitsune on Campus]'' manages to place [[
* ''[https://web.archive.org/web/20120424085315/http://smallcave.net/goferchan/afgoku01.html 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.
* I see your Goku/Anne Frank and raise you ''[http://www.fanfiction.net/s/991901/1/When_Wario_met_Mrs_Cartman When Wario Met Mrs. Cartman]'', which is, well, [[Exactly What It Says
* [http://www.fanfiction.net/s/899535/1/Heero_Potter_Yr_01 Heero Potter], where [[Mobile Suit Gundam Wing
* Because of the popularity of a background character "Dr Hoof/Whooves", there are a swarm of crossovers between ''[[
* ''[[
*
* [
* ''[http://www.moonie.ca/uglyduck/lnb/lbb.html#top Law and Bubbles]'', probably the only time you'll see ''[[
* [[Real Person Fic]] is well-known to feature this type.
** ''[[In The Dark]]'' has the [[Spice Girls]] and the [[Backstreet Boys]] on a joint-tour gone wrong.
** ''[[Astral Journey: It's Complicated]]'' has a variety of singers from [[The Nineties]] as athletes, like football (soccer) in this [[Alternate Universe]].
* ''[https://my.w.tt/8jwBy6qtGU Final Stand of Death]'' gets a [[Continuation]] fic of ''[[Celebrity Deathmatch]]'' and mixes with [[Planet Dolan]], random [[YouTube]]rs, and [[World Wrestling Entertainment|WWE]].
== [[Film]] ==
* ''[[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|Waynes World]]'', Wayne gets pulled over by a cop on a motorcycle... who turns out to be [[Terminator (franchise)|the T-1000]], looking for John Connor.
** He shows up again in ''[[Last Action Hero]]''.
* In ''[[Casper (
* In ''[[Little Nicky]]'', when Nicky goes to Heaven he finds {{spoiler|Chubbs, who had died in the earlier [[Adam Sandler]] film ''[[Happy Gilmore]]'', as a dance instructor.}}
* ''[[Godzilla]] vs [[King Kong]]'', in which the King of Monsters and King of Kong duke it out on Mount Fuji. It is epic.
* ''[[George of the Jungle (
== [[Literature]] ==
* The [[Expanded Universe|officially published]] ''[[Star Trek:
* A crossover introduced the crew of [[Star Trek:
{{quote|
'''Kirk:''' Did he just ''punch'' my ship?
'''Scotty:''' Aye, Captain. And he di' damage the shields a bit. }}
:::And my favorite:
{{quote|
'''Beast and Bones:''' [[
** [[Atop the Fourth Wall
** There is a novel where Picard meets the X-Men ([
*** This is made even funnier by the realisation that the book was published over a year before the first ''[[X
* Diane Duane is a ''[[
* [[Neil Gaiman]] won a Hugo Award for ''[[A Study in Emerald]]'', his crossover between [[Sherlock Holmes]] and the [[Cthulhu Mythos]].
* Since [[Discworld|L-Space]] means that libraries of sufficient size and/or complexity are interconnected, it's entirely possible for a crossover with anything. One wonders whether Havelock Vetinari and [[Girl Genius
** The fan story ''[https://www.tthfanfic.org/Story-25532/phouka+Inter-Library+Loan.htm Inter-Library Loan]'' by Phouka uses it to get [[Harry Potter|Winky the house-elf]] to the world of ''[[Buffy the Vampire Slayer]]'' by the good graces of The Librarian.
* 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 Character|public domain]], but the cast of [[Enid Blyton]]'s ''Shadow The Sheepdog'', Beatrix Potter's Mrs Tiggywinkle and Kathy Reichs' [[Bones|Temperance Brennan]] have all appeared with permission. (Of the estates in the first two cases, obviously.)
== [[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 (TV series)|Arrested Development]]'', and even ''[[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.
* MTM shows did this occasionally. Carla from ''[[
* The TARDIS, the [[Living Ship]] from ''[[
** The Doctor and Rose showed up for a panel of [[Buffy the Vampire Slayer
** The ''[[
** 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 ''[[
** Similarly, back in the heyday of [[
** Marvel also linked ''Doctor Who'' with ''[[
*** 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 [http://img.photobucket.com/albums/v283/factorialinfinity/prlggallifrey.jpg to boot,] This aired in 1999, Six years before the new series, [[Harsher in Hindsight|by the way.]]
* It appears that the soap opera ''[[Passions]]'' has set itself up as a sequel of sorts to the classic [[Fantastic Comedy]] ''[[
* The ''[[Power Rangers in Space]]'' encountered the five Turtles from ''[[Ninja Turtles:
** 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.
*** On that note about the ''[[Kamen Rider]]'' series, ''[[Ultraman]] vs. [[Kamen Rider (TV series)|Kamen Rider]]'' is actually more of a team-up special than a fight with the protagonists being portrayed by [[Fake Shemp
*** The upcoming special ''Super Hero Wars: Kamen Rider vs. Super Sentai'' will be bringing together 240 heroes across both franchises, and once again [[Kamen Rider Decade|Decade]] is involved.
* The ''[[
** One episode of ''[[
*** 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 ''[[
*** 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 ''[[
*** And since ''Cheers'' linked itself to ''[[St. Elsewhere]]'', that drags all of 1990s Must See TV into the autistic kid's dream.
* ''[[Martial Law]]'' crossed over onto ''[[
** ''[[
*** ''[[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 ''[[
** ''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 <s>Not-Flo</s> 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'' has also featured a few shoutouts to ''[[Alias (TV series)|Alias]]'', though it's unlikely they exist in the same universe due to Terry O'Quinn's characters in both shows being completely unrelated.
*** Likewise, an Oceanic Airlines flight to Sydney was mentioned in passing on ''Alias''.
*** An Oceanic Airlines ad also appeared during the pilot episode of ''[[
*** [[Lost
*** This could be because Oceanic Airlines is a generic name that a lot of shows use. [[Wikipedia
** Also, the {{spoiler|big "cork" on the bottle of evil}} at the end of the show pretty closely resembles {{spoiler|a [[Buffy the Vampire Slayer
* Speaking of ''[[
* In an episode of ''[[
* ''[[Crossing Jordan]]'' and ''[[Las Vegas]]'' crossed over so often that it probably doesn't even qualify as
** In one LV episode, Mary made a reference to booking a conference room for [[The Office|Dunder-Mifflin]], and ''[[Heroes (TV series)|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 ''[[
* 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 ''[[
* Because both series were produced by William Dozier, it was practically foreordained that [[
** As for the styles of the shows not meshing, it's interesting to note that 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.
* [[USA Network]] does this on a regular basis in their ads. If you take, say, [http://www.youtube.com/watch?v=R8oW0wBWlog "Monk: A Tribute"] as canon, ''[[
* [[Disney Channel]] took this to an extreme, theming two entire episodes specifically for the crossover: ''[[That's So Raven
* The [[
** Speaking of ''CSI'', that show once shared a rather odd crossover with the sitcom (and fellow CBS hit series) ''[[Two and A Half Men]]''.
* ''[[Fringe]]'' has a particularly interesting example of this trope. The Observer, or rather {{spoiler|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-Files
* 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? {{spoiler|Perry Mason himself}}.
* An episode of ''[[Warehouse 13]]'' included [[Butt Monkey|Douglas Fargo]] of ''[[Eureka]]''.
** And an episode of ''Eureka'' included Claudia Donovan from ''[[Warehouse 13]]''.
*** Actually, this is an example of a [[Shared Universe]], as both shows (as well as [[
* [[R. Lee Ermey]] turned up in Season 1 Episode 4 of ''[[Pawn Stars]]'' in full ''Lock n' Load'' gear.
* ''[[
* [[ER
* [[Comic Relief]] frequently features entirely non-canonical
** 1997's ''[[Prime Suspect]] [[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 ''[[
** 2009's ''When Janet Met Michelle'', which combined all BBC Three's sitcoms about twentysomethings, as the cast of ''[[Two Pints of Lager and
* Similarly, 2010's [[Children in Need]] telethon included ''[[Eastenders]] [[Coronation Street|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 [[Luke, I Am Your Father|Kat Moon's mother]], in a direct parody of the revelation that Kat is Zoe's mother. See also the ''[[
== [[Newspaper Comics]] ==
* [https://www.cbr.com/calvin-and-hobbes-part-bloom-county-continuity/ As of June 2021], ''[[Calvin and Hobbes]]'' is officially a part of ''[[Bloom County]]''{{'}}s continuity. While its genesis was as an [[April Fools' Day]] prank ''Bloom County'' cartoonist Berkeley Breathed perpetrated every year starting in 2016, in 2021 he got permission from Bill Watterson to use Hobbes in an extended storyline.
== [[Professional Wrestling]] ==
* [[New Japan Pro Wrestling]] has Jushin Liger, Tiger Mask, and Black Tiger, all of whom were 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 [[Twenty 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.
* When [[
* [[
* Chucky (the [[Creepy Doll]] from ''[[
== Toys ==
* Matt Trakker of ''[[
** [[Squee|SQUUEEEEEEEEEE--]] Oh, excuse me!
** And don't forget G.I.Joe's original
** Hasbro has also done ''G.I. Joe'' action figures for [[Rocky (
** And also ''G.I. Joe'' action figures for ''[[
* Hasbro recently came out with [[
** 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.
== [[Tabletop Games]] ==
* ''[[Spelljammer]]'' [http://sjml.spelljammer.org/archive/oracle/200008/01-000009.html fan campaign]: Second Unhuman War [[Beethoven Was an Alien Spy|as an extension]] of the [[Planescape|Blood War]]—that is, between Elves corrupted and manipulated by [[Chaotic Evil|Tanar'ri]] and [[Our Orcs Are Different|Scro]] corrupted (if they need more) and manipulated by [[Lawful Evil|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 (game)|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.
== Theme Parks ==
* Several examples in the [[Disney Theme Parks]]. The biggest example is ''[[Fantasmic]]'', where a [[Legion of Doom]] of [[
== [[Video Games]] ==
* ''[[Garry's Mod]]'' allows you to do all kinds of crossovers with the right mods. Want [[Halo (series)|John-117]] to team up with [[Half-Life (series)|Gordon Freeman]] and fight [[Mass Effect|Saren]]? Have fun.
* ''[[Mario & Sonic at the Olympic Games]]'' featured the first meeting of [[Super Mario Bros.|Mario]] and [[Sonic the Hedgehog]]. Since the pair were the mascots of former [[Console Wars|warring console makers]] [[Nintendo]] and [[Sega]] (respectively), [[Cue the Flying Pigs|this was something of a big deal for old-school gamers.]]
* Let's not forget ''[[Super Smash Bros.]]'' which features ''all'' of the Nintendo characters meeting (though technically it's not them, they're just Gashapon figurines brought to life). From Mario, to Link, to the Pokemon. And now there's the ones not from Nintendo, such as [[Sonic the Hedgehog]] and [[Metal Gear|Snake]].
* ''Mario Hoops 3-on-3'' and ''[[Mario Sports Mix]]'' add ''[[Final Fantasy]]'' characters to the traditional cast of Mario sports games.
* The ''
* 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 Land]] Blast: Featuring [[Bomberman]]!'' which is pretty much 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 matters, the ''[[Super Robot Wars]]'' series itself is ''built'' on the idea of [[Mazinger Z]] and Shinji Ikari teaming up to beat up Char Aznable.
**
* ''[[Mortal Kombat vs. DC Universe]]''.
** And in ''[[Mortal Kombat
**
* Though it's technically one series, each of the ''[[Final Fantasy]]'' games has [[Non-Linear Sequel|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]]''.
***
* DJ Atomica, the (some would say) [[Dumbass DJ|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 recent ''[[Yes! Pretty Cure 5
*** Some ''[[Ace Combat]]'' forum goers have taken the existence of ''iDOLM@STER'' skins in DLC to suggest that those characters are animated versions of actual musical artists in Strangereal.
* ''Super Puzzle Fighter II Turbo'' has characters from ''[[Street Fighter]], [[
* [[Capcom]]'s [[Capcom Versus Whatever|"Vs. series"]] started life as such with ''[[
** Capcom does a lot of crossovers. ''[[
* ''[[Shin Megami Tensei III
* 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 ''[[
* ''[[
* ''[[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, [[The Legend of Zelda
* [[Telltale Games]]'s latest game, ''[[
* 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 ''[[
* Interesting crossover here, in ''[[
** After this, the connection is pushed forward in [[
* Free Flash game crossover: In ''[[Shift]] 3'' you can unlock [[Fancy Pants Adventures|Fancy Pants Man]] as a [[Secret Character]].
* ''[[Metal Gear Solid 3
== [[Web Comics]] ==
* [https://web.archive.org/web/20100822085805/http://www.drunkduck.com/Crossoverlord/index.php?p=386131 The Crossoverlord]. (Yes, that's the name of the comic and the no space is intentional.)
** Now has a sequel called [https://web.archive.org/web/20101010170232/http://www.drunkduck.com/Crossoverkill/index.php?p=752922 Crossoverkill]
* Unwinder of ''[[Unwinder's Tall Comics|Unwinders Tall Comics]]'' adopted ''[[Marmaduke (comic strip)|Marmaduke]]''. Then, in the ''[[Watchmen (comics)|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 (webcomic)|Pv P]]'', Kris Straub proposed that his comic [[Starslip Crisis]] takes place in the same universe, just thousands of years later, and his characters are descendants of those in ''[[PvP]]''. [[Word of God|Scott Kurtz]] said it's canon, though maybe he was joking.
* ''[https://web.archive.org/web/20131111221623/http://www.whiteponyproductions.com/comicstrips/ctc/present.htm 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 [[Freefall|Florence]], [[21st Century Fox (webcomic)|Jack and Jenny]].
* ''[[Something*Positive]]'' is practically some sort of [[Massive Multiplayer Crossover]] nexus of webcomics. (See that article for more.)
* ''[http://dtoons.com/conroy/ The Cartoon Chronicles of Conroy Cat]'' has the story take place in Cartoon Land, and has cartoon characters from different series making appearances.''
* ''[[
* A storyline running through both ''[[
== [[Web Original]] ==
* ''[https://web.archive.org/web/20050901042111/http://www.starwreck.com/ 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.
* [http://www.howitshouldhaveended.com/ How It Should Have Ended] gives their take on how the ''[[Terminator (franchise)|Terminator]]'' series [http://www.youtube.com/watch?v=bBBw9E2Q_aY&feature should end]. With an [[Back to the Future (film)|unexpected crossover]].
* ''[[I'm a Marvel And I'm a DC]]'' has Marvel and DC characters (and occasionally characters from other continuities, such as ''[[Hellboy (comics)|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 [[Yu-Gi-Oh!: The Abridged Series|duel]], [[Vision of Escaflowne Abridged|Atlantis]] and [[Lanipator]] and Kaiser Neko's hotel room.
** And seeing as he had a Pokeball prior to his death, perhaps he also, at some point, visited [[Pokémon|another continuity]].
** He's also been spotted in [[Soul Eater|Death City]].
== [[Western Animation]] ==
* According to the special ''The Grim Adventures of the Kids Next Door'', ''[[The Grim Adventures of Billy
* ''[[
* [[
** ''[[
* Disney took this to another extreme with ''[[Lilo
** And, as a result, aliens are now [[Canon]] in ''[[
*** Though it does somewhat fit with ''[[
** And the fact that, by extension, ''[[American Dragon
** It's ''very'' confusing with ''[[
* In one episode of ''[[
** The episode name, for the curious, is ''The Green Loontern''. And in another episode (''Samurai Quack'') Dodgers takes the place of [[
* On ''[[The Simpsons (
** [https://web.archive.org/web/20130522090344/http://media.screened.com/uploads/0/5735/318691-thesimpsons_super.jpg The Agents asked if any of the following aliens are familiar]: [[Looney Tunes
*** 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 (
*** He appears again, along with other one-time characters voiced by [[Jon Lovitz]].
{{quote|
** [[Archie Comics|"D-uh! You stay out of Riverdale!"]]
** [[King of the Hill
** [[
** [[Cheers
** [[Dragnet|"Gee, Joe. You haven't been the same since your son went crazy in Vietnam"]]
* [[Greg Weisman]] has written a [http://www.s8.org/gargoyles/askgreg/search.php?rid=843 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:
* In an ad for ''[[
* Most of [[Hanna
* [[The Mask (
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[[Category:Canon Universe]]
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[[Category:Crossover Index]]
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