Characters in one series {{crossover}} to another series. A technique used to help define a [[TheVerse 'Verse]].
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!!Examples:

[[foldercontrol]]

[[folder: Anime and Manga ]]

* Characters from ''Manga/TheDayOfRevolution'' and ''Manga/FamilyComplex'' have roles of varying sizes in ''Manga/PrincessPrincess''. All three are written by Mikiyo Tsuda.
* ''Anime/AngelLinks'' employees Valeria Vertone and Duuz Delax Rex appear in an episode of ''Manga/OutlawStar''. Similarly, Fred Luo, Clyde, and Iris all appear at various points in ''Angel Links''.
* {{Nasuverse}}. See below under VideoGames.
* The Raildex. Characters in ''LightNovel/ACertainMagicalIndex'', ''Manga/ACertainScientificRailgun'', and ''Manga/ACertainScientificAccelerator'' cross over frequently since most of the action takes place in Academy City.
* Anything by Creator/{{CLAMP}} will have this. ''Manga/TsubasaReservoirChronicle'' took this idea and went UpToEleven.
** Prior to ''Tsubasa'' the title characters of ''CLAMPSchoolDetectives'' were probably the worst offenders. Two of them were also the lead characters of separate series (though one only lasted a single issue) and the third was a supporting character in DuklyonClampSchoolDefenders. And this is ''before'' they put in a brief appearance in ''X1999''.
* Isaac and Miria, lovable robbers from ''LightNovel/{{Baccano}}'', make cameos as [[spoiler:members of the Dollars]] in ''LightNovel/{{Durarara}}''. Since they're [[spoiler:immortal]], having them be in Durarara's time period is easy.
* Creator/KenAkamatsu reused the one-shot character Mei from ''Manga/LoveHina'' in ''Manga/MahouSenseiNegima''.
* Eiji Ohtsuka's manga ''Manga/MPDPsycho'' and ''Manga/TheKurosagiCorpseDeliveryService'' both have a cop named Sasayama as a secondary character. Ohtsuka has [[WordOfGod confirmed]] that they are the same person and not just two people with a coincidental similarity of name.

[[/folder]]

[[folder: Comics ]]

* This is what helped define the official [[Franchise/MarvelUniverse Marvel]] and [[Franchise/TheDCU DC]] Universes back in the 50s and 60s.
* Obscure 1980s black-and-white comic ''Tales from the Aniverse'' featured a cat bounty hunter named Miss Chevious. Cartoonist Randy Zimmerman carried the character over into her own series, which runs in ''Flint Comix & Entertianment'' over 20 years later.
* The ''ComicBook/BuffyTheVampireSlayer'' Season 8 comic ''Time Of Your Life'' crosses over with ''{{ComicBook/Fray}}'', which takes place in the future. [[ArcWelding Buffy meets Melaka Fray]] and finds out that [[EvilSorcerer Willow is still alive and wants her dead.]] In season 9, Willow tries to keep this from happening.
** [[Series/{{Angel}} Illyria]] shows up late in season 9.

[[/folder]]

[[folder: Fan Works ]]

* ''WebAnimation/ZanyToTheMax'' has at least one crossover per season. All the crossovers are in this style (either the Warners enter into the other series, or characters from the other series enter the Animaniacs world).
** Played for laughs in a parody of ''WesternAnimation/MonstersInc'' when Sekoila searches for a cat who has entered the Animaniacs world and misunderstands the Warners when they keep telling her about "[[spoiler:South Dakota]]" (which happens to be the name of the cat).
-->'''Yakko:''' Excuse me, Sekoila, but have you seen [[spoiler:South Dakota]]?\\
'''Sekoila:''' No, I haven't, Yakko. I've never even been there!
** Interestingly, the Monsters, Inc. parody is in the third season, which consists of ''[[UpToEleven entirely]]'' crossover episodes!
* While it's all fanfiction, Fanfic/JakeEnglishsMysteriousTheaterOfScientificRomanceFromTheYear3000 has guest stars from Webcomic/DinosaurComics, ''VideoGame/FinalFantasyXIII2'', Franchise/TheDCU, Website/ThatGuyWithTheGlasses, ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' and ''Franchise/{{Pokemon}}''. There's also an OC inspired by {{Webcomic/Cordless}}, and a {{Nasuverse}} OC.
** This is very common in {{MST}}s featuring an original team rather than the original ''Series/MysteryScienceTheater3000'' team. Members of the crew can and do come from virtually any medium. For more examples, see the [[http://z4.invisionfree.com/Refia/index.php?act=idx Refia]] forum.
* ''Fanfic/RedFireRedPlanet'' and ''Fanfic/{{Bait and Switch|STO}}'' overlap some characters with both each other and with the ''Franchise/StarTrek'' {{canon}}.
** Ba'woV, chief engineer of the IKS ''mupwI[='=]'' in ''RFRP'', is stated to have been an engineer on a freighter called the ''Shargrash'' when she first met her current husband Brokosh, a Lethean [[HiredGuns mercenary]] now in the employ of the Klingon Defense Force. The ''Shargrash'' was the freighter that the USS ''Bajor'' rescued from some Jem'Hadar in chapter five of ''B&S''.
** Ensign Kate [=McMillan=], a MauveShirt on the USS ''Bajor'' in ''B&S'', is one of the viewpoint characters of ''RFRP''.
** Will Riker and Deanna Troi from ''Series/StarTrekTheNextGeneration'' also appear. Will is now a fleet admiral working at Starfleet Command, while Deanna is the head of the Diplomatic Corps. She doesn't get any lines because she's still asleep in her only scene (it being three in the morning in San Francisco when Will was called in due to an imminent Klingon attack on Sol).

[[/folder]]

[[folder: Film ]]

* Jay and Silent Bob famously reappear in all six ViewAskewniverse films - and also pop up in ''[[Franchise/SCream Scream 3]]''.
** And some characters from different films are actually related to each other.
* Han from ''{{The Fast and the Furious}}'' films is also the very same Han from ''Film/BetterLuckTomorrow'' [[WordOfGod according to]] Creator/JustinLin.
* In the first live-action ''Film/{{Transformers}}'' [[Film/TransFormers movie]] directed by Creator/MichaelBay, Travis Van Winkle plays a JerkJock named Trent [=DeMarco=]. The [[Film/FridayThe13th2009 2009 reboot]] of ''Franchise/FridayThe13th'', also produced by Michael Bay, has Travis Van Winkle play a JerkJock named Trent [=DeMarco=]. According to WordOfGod, they're the same character.
* Like the comics it's based on, the Franchise/MarvelCinematicUniverse has several overlapping characters. Many of these are EarlyBirdCameo teases for later films. Not counting minor cameos, or the ''Avengers'' movies (and ''Film/CaptainAmericaCivilWar'') that have crossing over as a main selling point:
** Nearly every movie in Phase One has an appearance by either Nick Fury or Agent Coulson. The exception is ''The Incredible Hulk'', where Tony Stark represents SHIELD in their place.
** Black Widow first debuts as a supporting character in ''Iron Man 2'', then later becomes a supporting character in ''Film/CaptainAmericaTheWinterSoldier''. Minor character Senator Stern also appears in both films.
** Howard Stark, introduced in the ''Iron Man'' films as Tony's late father, is a supporting character in the franchise's WWII-era adventures (''Captain America'' and the ''Agent Carter'' One-Shot and series). He's also slated to appear in ''Ant-Man''.
*** Speaking of which, other ''Captain America'' WWII characters have carried over to the ''Agent Carter'' projects: Peggy Carter (of course), Dum-Dum Dugan, and [[spoiler:Arnim Zola]].
** ''Series/AgentsOfSHIELD'' stars Coulson and has seen small appearances from just about every other agent seen in the movies and One-Shots (up to and including some of the WWII founders via flashback), plus two episodes involving ''Thor'''s Lady Sif.
** An alien race called the Kree have shown up in multiple projects: ''Guardians of the Galaxy''[='s=] villain Ronan the Accuser is a Kree extremist, ''Agents of S.H.I.E.L.D.'' has had major subplots involving Kree artifacts (including a couple of run-ins with Kree themselves), and the upcoming ''Captain Marvel'' and ''Inhumans'' films are likely to be involved as well given that their comics versions have connections to the Kree. (In fact, the aforementioned ''Agents'' subplots [[spoiler:have involved Inhumans heavily and confirmed their relationship to the Kree]].)
** Between his two movie appearances (''Captain America: The Winter Soldier''[='s=] mid-credits scene and the opening of ''Avengers: Age of Ultron''), high-ranking [[spoiler:HYDRA]] scientist Dr. List makes some appearances on ''Agents of S.H.I.E.L.D.'' as a major enemy; his boss Baron Strucker also got name-dropped regularly during that same period.
** A major scene in ''Age of Ultron'' involves the arms dealer Ulysses Klaue, who will later carry over into ''Black Panther''.
** Among the Netflix shows, ''Series/{{Daredevil 2015}}'' features Madame Gao, who is strongly implied to be a future ''Iron Fist'' character, and Luke Cage is slated to appear in ''Series/JessicaJones2015'' before he gets a series of his own. And like ''Avengers'' is to the movies, ''The Defenders'' is designed to be a crossover project bringing all the Netflix shows together.
*** Connecting to the wider MCU, Carl "Crusher" Creel plays notable parts in both Season 2 of ''Agents of S.H.I.E.L.D.'' and the backstory of ''Daredevil'', though he doesn't appear onscreen in the latter.

[[/folder]]

[[folder: Literature ]]

* Although the Literature/{{Discworld}} is technically one series, readers tend to group the books according to which recurring protagonist is the focus, and certain said protagonists cross over briefly into other books. (In particular, Pterry has noted that it's very hard to set a novel in Ankh-Morpork ''without'' the Watch taking an interest.)
** One WhatCouldHaveBeen moment: at one point Pterry considered that the various powers attending the Low King's coronation in ''Discworld/{{Thud}}'' would include the King and Queen of Lancre. We'd know they were Verence and Magrat, but to Vimes they'd just be a couple of royals he was briefly introduced to.
* One of BretEastonEllis's signature techniques: Clay, the protagonist of ''Literature/LessThanZero'', is a minor character in ''Literature/TheRulesOfAttraction''; Patrick Bateman, a minor character in ''Literature/TheRulesOfAttraction'', is the protagonist of ''Literature/AmericanPsycho'', and so on.
* Creator/AgathaChristie does this a fair bit. For example, Inspector Japp of the [[Literature/HerculePoirot Poirot]] series appears in the first Literature/TommyAndTuppence book.
* Creator/BanjoPaterson's poem "Film/TheManFromSnowyRiver" namedrops the title character of another of his works, "Clancy of the Overflow." Clancy is also given a prominent role in the movie adaptation.
** And "Harrison, who made his pile when Pardon won the cup" is presumably the narrator and placer of the victorious bet in Paterson's "Pardon, the Son of Reprieve".
* Creator/StephenKing will often make brief references to characters and events from previous books, especially if those books took place in Castle Rock, Maine.
* The character Hoid appears in all of the works of BrandonSanderson set in the Cosmere (''{{Mistborn}}'', ''{{Elantris}}'', ''Literature/TheStormlightArchive'' and ''{{Warbreaker}}'') to serve various roles, such as a begger or a storyteller.
* Creator/PGWodehouse did this quite a bit, mostly by having characters in more than one series belong to the Drones Club or visit/make reference to Literature/BlandingsCastle.
* S.M. Stirling's Nantucket series is confirmed to be connected to the author's Emberverse series.
* One of Thomas Disch's stories made a brief reference to the horrible fate of the main character in his story "The Roaches."
* Several characters from L. Frank Baum's lesser-known books made appearances in Oz, most notably Cap'n Bill and his ward Trot, and a boy named Button-Bright who had a talent for ending up precisely where he wanted to be despite getting lost along the way.
* Frequently occurs in the ''Literature/TortallUniverse'' by Creator/TamoraPierce. In fact, it occurs in ''every'' sub-series. Alanna's crowd are significant characters in ''Literature/TheImmortals'', Daine is a friend of Keladry's in ''Literature/ProtectorOfTheSmall'', and ''Literature/DaughterOfTheLioness'' is about, [[CaptainObvious Alanna's daughter]]. The exception is ''Literature/ProvostsDog'' as it's a prequel; even then, the protagonist is an ancestor of Alanna's husband and meets one of Alanna's own ancestors.
* Brother Zachariah from ''Literature/TheMortalInstruments'', is [[spoiler:[[Literature/TheInfernalDevices Jem Carstairs]], who appears the way he does due to being unable to complete the entrance rituals because of the ''yin fen'' in his body]].

[[/folder]]

[[folder: Live Action TV ]]

* ''Series/BostonPublic'', ''[[Series/AllyMcBeal Ally [=McBeal=]]]'' and ''ThePractice'' had a crossover.
** Alan Shore from ''ThePractice'' went to join the law firm in ''Series/BostonLegal''.
* ''Series/BeverlyHills90210'' begat ''Series/MelrosePlace'' which begat ''Models Inc''. Characters like Jake from ''Melrose Place'' appeared on ''90210'' before ''Melrose Place'' began. Later ''Melrose Place'' characters appeared on ''Models Inc.'' (Amanda Woodward's mother and half-brother ran ''Models Inc.''). Later, some of the original ''90210'' cast members returned for the reboot of ''90210'' and some of the original cast of ''Melrose Place'' returned for the reboot of that show as well.
* Steve Urkel of ''Series/FamilyMatters'' fame has appeared in both ''Series/FullHouse'' and ''Series/StepByStep''.
* ''Series/BuffyTheVampireSlayer'' / ''Series/{{Angel}}'':
** The characters in both shows inhabited the same universe and crossed-over regularly. Angel, Cordelia, Wesley, Spike, and Harmony all started on ''Buffy'' and then became main characters on ''Angel''. It's worth noting that they are the ones who end up with the most character development; all of them except for Harmony end their time in the Buffyverse ''very'' different from when they first appeared.
** Rumor has it, if ''Series/{{Firefly}}'' had continued, at some point, the crew would have been passing a bar, one of the characters in a long black coat would have said, "Nothing ever bloody changes," before turning around to reveal himself as Spike.
** The ''ComicBook/{{Fray}}'' comics take place in the Buffyverse in the distant future, in which Buffy and the new slayers are long dead. Melaka Fray herself crossed into the ''Buffy Season Eight'' comic book during one arc.
* Thanks to a whole mess of anarchy, same thing went between ''Series/HerculesTheLegendaryJourneys'' and ''Series/XenaWarriorPrincess''. Considering that Xena was originally a villain character from ''Hercules'' who ended up [[SpinOff getting her own show]], it was frankly inevitable.
* Characters from ''{{Cheers}}'', including Norm, Cliff, Rebecca, and Frasier appeared on ''Series/{{Wings}}'', and later on the spin-off ''{{Frasier}}''.
** Carla, Norm and Cliff were also in an episode of ''StElsewhere'' titled, amusingly enough, "Cheers". Carla has also appeared on the short lived ''Cheers'' spin-off ''TheTortellis'' which revolved around her ex-husband Nick, their brood of children and Nick's new wife Loretta most of which were recurring characters on Cheers.
* Dr. Roxanne Turner from ''StElsewhere'' showed up on an episode of ''HomicideLifeOnTheStreet''. Dr. Victor Ehrlich from St. Elsewhere appeared in the Homicide movie.
** Speaking of St. Elsewhere, related to this trope is the "Tommy Westphall Universe", a theory which posits that nearly 90% of all American television exists in a shared universe, [[spoiler:which exists entirely inside the mind of Tommy Westphall, an autistic child character on StElsewhere who, in the series finale, is revealed to be looking into a snow globe and imagining the events of the television show]]. StElsewhere crossed over with many different shows, which themselves crossed over with, and spun off, many different shows, which themselves crossed over, etc, creating an interweaving "universe" than encompasses a good majority of American television.
* Richard Belzer has played Baltimore (later NY) PD detective JustForFun/JohnMunch on approximately a ''dozen'' different TV series.
** In addition to Belzer's example, ''LawAndOrderSVU'' had Angie Harmon from the parent series consulting in the first series before they got their own, dedicated prosecutor. Whoever was playing the District Attorney in the parent series would also occasionally have an appearance.
* Characters from ''Series/StargateSG1'' and ''Series/StargateAtlantis'' regularly crossover.
** Several characters from ''SG-1'' have also appeared on ''Series/StargateUniverse'' more than once.
** [=McKay=] and Woolsey were both introduced as one-off antagonists in ''SG-1'' before becoming regular characters on ''Series/StargateAtlantis''. They both appeared in the ''Series/StargateUniverse'' Season 2 episode "Seizure" to boot, making them the only ''Atlantis'' regulars bar Samantha Carter to appear in ''Universe''.
* Characters from ''Series/{{Friends}}'' and ''MadAboutYou'' have crossed over. Mostly it's been Phoebe and Ursula Buffet, identical twins both played by Lisa Kudrow. Kudrow originally appeared as Ursula on ''Mad About You'', and when she was cast as Phoebe on ''Friends'', the two characters were made into twins to explain their identical appearance.
* The DisneyChannel did this with a triple crossover of some of their most popular shows, a mishmash called ''[[ThatsSoRaven That's So]] [[TheSuiteLifeOfZackAndCody Suite Life of]] HannahMontana''.
** They performed another hodgepodge later, with ''[[WizardsOfWaverlyPlace Wizards]] [[TheSuiteLifeOnDeck on Deck]] With Hannah Montana.''
* Rare PanelGame example; before the final axing of its third part, ''[[HaveIGotNewsForYou Have I Got]] [[NeverMindTheBuzzcocks Buzzcocks]] [[TheyThinkItsAllOver All Over]]'' was an irregular Series/ChildrenInNeed occurrence.
* Jack Harkness debuted in ''Series/DoctorWho'' then got spun off into his own show, ''Series/{{Torchwood}}''. Similarly, Sarah Jane Smith originated on ''Doctor Who'' back in the '70s, had a brief spinoff called ''Series/K9AndCompany,'' then returned to the revived series in the mid '00s before receiving her own spin-off, ''Series/TheSarahJaneAdventures'', taking [[TeamPet K-9]] along with her. Both of them returned for the 2-part fourth series finale of ''Doctor Who'' which also brought along two other characters from their own shows (Mr. Smith and Luke from ''SJA'' and Gwen and Ianto from ''Torchwood''). Earlier Martha Jones had appeared on ''Torchwood'' for a story arc and later the Tenth Doctor visited Sarah Jane on ''SJA''. Both characters then later reappeared for the Tenth Doctor's last story along with several other characters who had appeared throughout his tenure. The Eleventh Doctor appeared on ''SJA'' bringing along Jo Grant who was a companion to the Third Doctor just before Sarah Jane. Meanwhile, an early version of K-9 that had been PutOnABus back in 1978 was featured in a non-BBC spin-off, ''Series/{{K9}}''.
* In the ColdOpen of the episode "Seminar" from ''Series/TheOfficeUS'', Michael Scott runs into David Brent, his counterpart from the original British series. David appears again in the season 7 finale "Search Committee" as one of the people auditioning to replace Michael as manager.
* The character Director Leon Vance appears in both ''Series/{{NCIS}}'' and, its spin-off, ''Series/NCISLosAngeles'', being that he is the director of the Naval Criminal Investigative Service in CBS's ''NCIS'' franchise.
** A very subtle version happens in the first season of ''Series/{{NCIS}}'' when Bud Roberts from ''Series/{{JAG}}'' appears as to consult on an old case.
* Kensi from ''Series/NCISLosAngeles'' made a guest appearance on the revival of ''Series/HawaiiFive0''. And then ''Series/NCISLosAngeles'' and ''Series/HawaiiFive0'' did a two-way crossover where Callen and Sam came to Hawaii to prevent a black-market bioweapons buy, then Danno and Chin Ho went to L.A. to stop one of the involved parties from unleashing the bioweapon in question.
* The character Penelope Garcia is the technical analyst in both ''Series/CriminalMinds'' and its spin-off, ''Series/CriminalMindsSuspectBehavior''.
* The second season finale of ''Series/CougarTown'' features appearances by [[{{Scrubs}} Ted Buckland]] and [[Series/{{Community}} Abed]].
** The second season finale of ''Series/{{Community}}'' also features a brief blink and you miss it cameo of two characters from Cougar Town. Also, Abed references his being an extra on ''Cougar Town'' in ''Community''.
*** Which he [[https://www.youtube.com/watch?v=cWfJYJMrYa0 actually appears in. As an extra.]]
** Oddly enough, while some actors who have appeared in creator Bill Lawrence's earlier series ''Series/{{Scrubs}}'' have also appeared in ''Cougar Town'', Ted is the only character that appears in both shows, and the show ''Scrubs'' [[RecursiveCanon exists in that universe]]. He even noticed how weird it was that some of the characters in ''Cougar Town'' [[CelebrityParadox looked like people he knew.]]
* Naturally, the different iterations of ''Franchise/StarTrek'' feature cameos from different characters, and share recurring nemeses like Q and The Borg. Worf is particularly notable for being a main character on both ''Series/StarTrekTheNextGeneration'' and ''Series/StarTrekDeepSpaceNine''. O'Brien also counts; he started out as a nameless extra in TNG's pilot episode, becoming one of the most recurring characters on the show before being promoted to series regular on [=DS=]9.
** He's also an identically-named IdenticalGrandson of Colonel Worf in the last original ''Film/{{Star Trek|VI The Undiscovered Country}}'' movie, allowing Worf to sorta be in ''three'' series.
** Every ''Franchise/StarTrek'' series begins with a sendoff from someone from another (except the original, of course.) In ''Series/StarTrekTheNextGeneration'' [=McCoy=] visits the new Enterprise; in ''Series/StarTrekDeepSpaceNine'', Picard arrives at the station; in Voyager, we first meet Harry at Quark's bar. Of course, ''Series/StarTrekEnterprise'' is harder to do it with without TimeTravel, but we do see a video of Zefram Cochrane, played by the same actor as in ''Film/StarTrekFirstContact.'' And, [[spoiler:Will Riker is actually in the holodeck playing out a historical recreation]] for the ''final'' episode (now considering this is a ''prequel'' series...)
*** Even the films follow this: ''Film/StarTrekGenerations'' includes several original cast members in the beginning and [[spoiler:Kirk via basically time-travel]] passes the torch to Picard. While, in [[Film/StarTrek the more recent reboot]], [[spoiler:Spock travels back in time and explains the origin of the villain.]]
* Mr. Drucker appeared on both ''Series/GreenAcres'' and ''Series/PetticoatJunction'', as his grocery store was frequented by both show's characters. The two shows often had characters visit each other regularly in the early seasons.
* ''Series/OnceUponATime'' and ''Series/OnceUponATimeInWonderland'' are set in the same 'verse and have had several one-way (OUAT-to-OUATW) crossovers. The crossover is set to happen the other was as [[spoiler: ABC announced in April 2014 that at least one major character from the now-cancelled ''Wonderland'' is to join the regular cast of the parent series for the 2014-15 season.]]
* [[Series/EverybodyLovesRaymond Ray Barone]] and [[Series/TheKingOfQueens Doug Heffernan]] were shown to be friends and often appeared on each other's shows.
** However, Kevin James originally played a completely different character (who also happened to be Ray's friend) on Series/EverybodyLovesRaymond.
* [[Film/OutOfSight Karen Sisco]] appears in ''{{Series/Justified}}'', but due to rights issues uses the surname Goodall with the explanation that she's since married. She's played by Creator/CarlaGugino, who played her in the character's short lived television series.

[[/folder]]

[[folder: Newspaper Comics ]]

* ''BloomCounty'' cartoonist Berke Breathed carried over two characters from ''The Academia Waltz'', a strip he did for his college's newspaper: Steve Dallas and Cutter John (then known as Saigon John).

[[/folder]]

[[folder: Professional Wrestling ]]

* The Wrestling/NationalWrestlingAlliance wasn't the first, or even the second wrestling body to proclaim a '''World Heavyweight Championship''', but it turned the world title belt into a powerful marketing tool by establishing a larger alliance of wrestling promotions around the world than ever before seen and sending the world champion through each of them to defeat local competitors and legitimize himself, each promotion having some say in who would hold the belt. The NWA has/had several other world champions to.
* Wrestling/RingOfHonor officially recognized Wrestling/{{SHIMMER}}'s champions as its own "women of honor" and The World Wrestling Network established itself as such by having the Full Impact Pro Heavyweight Champion defend his belt at ROH events.
* The Allied Independent Wrestling Federations each have their own separate title belts but all recognize a specific group of champions who represent them all. Even though Ring Wars Carolina is not an official member of the AIWF, they still did away with their own women's championship (in favor of a No Limitz belt anyone could challenge for) and hosted AIWF women's championship matches instead, including the match to decide the very first women's champion.
* Pro Wrestling International, fearing the end of pro wrestling as we know it, got the idea to send its champions to independent promotions in Canada and Europe, to get them recognized by them and promote collaboration, realizing in the current climate, competition wasn't always necessary, or even best for business.
* The World Wrestling League titles have been defended in promotions ranging from The Dominican Republic to Mexico to Bolivia and occasionally it works the other way around, with NRW LL, WWC and all around Puerto Rican star Glamour Boy Shane being acknowledged as such in Wrestling/{{TNA}}, despite being a lowly referee there or its talent's TNA exploits being openly referred to during their Wrestling/{{AAA}} or Wrestling/{{CMLL}} appearances.

[[/folder]]

[[folder: Video Games ]]

* [=RPGs=] are well known for cameo characters making appearances in different games by the same developers, though these characters don't necessarily indicate that the games take place in the same universe, and are often a sort of internal ShoutOut.
** Cless and Arche from ''VideoGame/TalesOfPhantasia'' appear in ''VideoGame/TalesOfDestiny'', as does Clemente from ''VideoGame/TalesOfDestiny''.
** Chelsea from ''VideoGame/TalesOfDestiny'' appears in ''VideoGame/TalesOfEternia''.
** ''VideoGame/TalesOfHearts'' raises this to a gameplay element; scattered through the game are artifacts that let you summon characters from every prevous ''Franchise/TalesSeries'' game to perform an attack for you in battle, from [[VideoGame/TalesOfPhantasia Arche]] to [[VideoGame/TalesOfInnocence Ruca and Iria]], and Caius and Rubia from the otherwise all but disowned ''Tales of the Tempest''. As well as other characters from Bandai Namco games, like Gil, Klonoa, and KOS-MOS.
** Gilgamesh from ''VideoGame/FinalFantasyV'' makes appearances in other ''Franchise/FinalFantasy'' games, such as 8, 9, and 12. And, retroactively, I and VI.
** Balthier from ''VideoGame/FinalFantasyXII'' and Luso from ''VideoGame/FinalFantasyTacticsA2'' appear in the remake of ''VideoGame/FinalFantasyTactics''. Several ''FFXII'' characters also appear in ''A2'', this time appearing to indicate that the two games ''do'' take place in the same universe. [[WordOfGod Same universe, same planet, even the same]] ''[[WordOfGod kingdom]]'', [[WordOfGod for the most part]]. [[IvaliceAlliance Ivalice]], it's called. VagrantStory's in there, too.
** ''VideoGame/DissidiaFinalFantasy'' appears to indicate that all the FF games are part of the same "multiverse", if rather shakily.
** Bleu/Deis appears in several ''BreathOfFire'' games.
** Gabrielle Celeste and Ethereal Queen appear in all the ''StarOcean'' and ''ValkyrieProfile'' games (made by tri-Ace). In addition, Lenneth and Freya from [=VP1=] appear in ''VideoGame/StarOceanTillTheEndOfTime''; Puffy and Raddle the Traveler appear in all three ''StarOcean'' games; Dirna Hamilton and Solon Solute from [=SO3=] appear in [=VP2=]; Welch from [=SO3=] appears in the remake of [=SO1=].
** Many of Nippon Ichi's games feature crossovers, such as [[VideoGame/DisgaeaHourOfDarkness Etna]] and [[VideoGame/LaPucelle Priere]].
* The ''Franchise/ShinMegamiTensei'' series has included many crossovers, from the main character from ''VideoGame/ShinMegamiTenseiIf...'' appearing in ''VideoGame/{{Persona}}'' and ''{{Persona 2}}'', and more recently Raidou appearing in the rerelease of ''VideoGame/ShinMegamiTenseiNocturne'' (in place of [[VideoGame/DevilMayCry Dante]]) included with the special edition of ''Raidou Kuzunoha 2''.
* While the older ''AceCombat'' games were unambiguously set in the same ConstructedWorld, their storylines were so self-contained that they could have just as well been taking place in parallel universes. However, a [[http://acecombat.wikia.com/wiki/Category:Cross-game_characters few overlapping characters]] linked the storylines together.
* The Monsta and Mighta enemies from ''VideoGame/BubbleBobble'' also appeared in the earlier Creator/{{Taito}} game ''Chack'n Pop''.
* Sam Durkin first appeared in ''VideoGame/TheShivah'', he has since gotten a more expanded role in ''VideoGame/TheBlackwellSeries''.

[[/folder]]

[[folder: Visual Novels ]]

* A handful of overlapping characters is all that holds the TypeMoon multiverse together (the convoluted magic laws aside): CoolOldGuy Zelretch plays a large role in the backstory of ''{{Tsukihime}}'' and makes a cameo appearance in ''VisualNovel/FateStayNight''. CoolBigSis Touko Aozaki is a major character in ''LightNovel/KaraNoKyoukai'', is mentioned briefly in ''Fate'', and her sister Aoko appears in ''Tsukihime'' and is the protagonist of ''VisualNovel/MahouTsukaiNoYoru''.
* When [[Creator/VoltageInc Voltage Entertainment USA]] localized ''VisualNovel/MySweetBodyguard'' into ''To Love & Protect'', Japanese Prime Minister Hiraizumi was adapted into President Robertson and his bodyguards Daichi Katsuragi and Subaru Ichiyanagi into Secret Service agents Chadwick [=McGrew=] and Edgar Morton. Robertson subsequently appears in a major supporting role in the Voltage USA original game ''VisualNovel/QueensGambit'', with Chadwick and Edgar in minor roles. It's not clear if this is a case of shared continuity, alternate continuity, or simply recycling of convenient existing character assets.

[[/folder]]

[[folder: Webcomics ]]

* The Midnight Crew appeared in the tenuously canonical Fan Donation section of ''Webcomic/ProblemSleuth'' before having an intermission to themselves in ''Webcomic/{{Homestuck}}'', which was revealed at the end to have storyline relevance with [[spoiler: the Crew being the Trolls' equivalent of WV, and the rival gang being led by the BiggerBad]].

[[/folder]]

[[folder: Western Animation ]]

* Another Disney example -- WesternAnimation/KimPossible, Ron Stoppable, and Rufus the naked mole rat teamed up with Lilo in an episode of ''WesternAnimation/LiloAndStitchTheSeries''.
** And ''again'' in another episode of the same show, this time with the titular character of ''WesternAnimation/AmericanDragonJakeLong'' and his two best friends teaming up with Lilo and Stitch.
** And ''double again'' with crossovers with ''WesternAnimation/{{Recess}}'' and ''WesternAnimation/TheProudFamily''.
* One episode of the TV version of Disney's ''Disney/{{Hercules}}'' involved a crossover with the cast of ''Disney/{{Aladdin}}''.
* Many 1970's-era Creator/HannaBarbera adventure characters appeared in episodes of ''WesternAnimation/ScoobyDoo,'' and vice versa, including: Jeannie, WesternAnimation/SpeedBuggy, Dynomutt, and WesternAnimation/JosieAndThePussycats.
** Similarly, a ''SpaceGhost'' cliffhanger was resolved with the aid of the company's less-remembered ''Moby Dick'' interpretation.
** And then there's ''TheJetsons Meet TheFlintstones''. Hanna-Barbera loved this trope.
** ''WesternAnimation/JohnnyBravo'' also had a crossover episode with ''Scooby-Doo''.
* ''WesternAnimation/DuckTales'' and ''WesternAnimation/DarkwingDuck'' have Launchpad [=McQuack=] in common as a main character, and Gizmo-Duck as a notable recurring one. ''Darkwing'' also saw the occasional cameo from Flintheart Glomgold, the Beagle Boys, and Magica De Spell.
* One episode of the ''Film/AceVentura'' AnimatedAdaptation featured Stanley Ipkiss from the animated adaptation of ''WesternAnimation/TheMask''.
* ''{{WesternAnimation/Animaniacs}}'' begat ''WesternAnimation/PinkyAndTheBrain'', which became ''WesternAnimation/PinkyElmyraAndTheBrain'' with the inclusion of Elmyra from ''WesternAnimation/TinyToonAdventures''.
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