History Main / CrossoverExclusiveVillain

** In ''Series/CrisisOnEarthX'', [[Series/{{Arrow}} Green Arrow]], Series/{{the Flash|2014}}, [[Series/{{Supergirl|2015}} Supergirl]], and the Series/LegendsOfTomorrow team up to fight their [[EvilCounterpart evil counterparts]] and Nazis from Earth-X.

** The villain of the second game, ''Battle For Volcano Island'', is a purple monster called the Mawgu. Said villain has never been in any of the four shows.

** In ''Series/CrisisOnEarthX'', [[Series/{{Arrow}} Green Arrow]], Series/{{the Flash|2014}}, Series/{{Supergirl|2015}} Supergirl]], and the Series/LegendsOfTomorrow team up to fight their [[EvilCounterpart evil counterparts]] and Nazis from Earth-X.

* In ''Crisis on Two Comics'', a crossover between Doc Glasgow's two comics ''Webcomic/EnnuiGO'' and ''Webcomic/BlackHole'', the villains are a tantric sex cult called the Gardeners. According to their leader Mother Rose, they are a self-help group that focuses on radical sexual exploration. However, it's revealed that their true intentions are much more sinister as members of their group are mysteriously disappearing and a member of Key Manati's diamond guard is caught as an infiltrator, thus inspiring Izzy to contact Diana Nox for her assistance. After the [[GodhoodSeeker leader's]] [[LoveGoddess plan]] is revealed and the cult is defeated, they were sent away to Key Manati's prison, where Mother Rose implies that she may return to face the protagonists again.

** The subsequent miniseries featuring the OriginalGeneration character Access had as its villain [[spoiler: Dr Strangefate]], the last survivor of the Comicbook/AmalgamUniverse. The sequel had a BigBadDuumvirate of Comicbook/{{Magneto}} and Comicbook/{{Darkseid}}, but TheManBehindTheMan was [[spoiler: a BadFuture version of Access himself]].

* The first crossover with IDW's ''[[ComicBook/TeenageMutantNinjaTurtlesIDW Teenage Mutant Ninja Turtles]]'' and ''[[ComicBook/GhostbustersIDW Ghostbusters]]'' series has Chi-You, a lost member of the Pantheon who ended up in the Ghostbusters' universe after the Turtles and their allies used a dimensional transporter. After both teams manage to trap him, he gets sent into deep space back in the Turtles' universe, but he has yet to come back outside of a single throwaway mention.

* ''Film/GhidorahTheThreeHeadedMonster'' introduced the title character as this trope, an extraterrestrial threat so severe that he necessitated the crossover team-up of Franchise/{{Godzilla}}, Film/{{Mothra}}, and {{Film/Rodan}}. Unusual for this trope, however, Ghidorah would not end up as a simple one-off villain, and [[BreakoutVillain gradually became Godzilla's most iconic foe of all]].

** In ''Series/CrisisOnEarthX'', [[Series/{{Arrow}} Green Arrow]], [[Series/TheFlash2014 the Flash]], [[Series/Supergirl2015 Supergirl]], and the Series/LegendsOfTomorrow team up to fight their [[EvilCounterpart evil counterparts]] and Nazis from Earth-X.

** ''Globs of Doom'' features a giant orange BlobMonster called Globulous Maximus as the BigBad, who is technically based off the {{Creator/Nickelodeon}} slime imagery but doesn't actually appear in any of the represented shows.

* ''VideoGame/ProjectXZone'': The new villains belong to the Oros Phlox organization, whose objective is to warp reality and mesh multiple worlds together by tampering with a mysterious artifact called Portal Stone. However, the members receive little focus, as they mostly resort to sending established Namco, Capcom and Sega villains to do their work. The true nature of the organization isn't revealed until the final chapter: [[spoiler:They are all [[WellIntentionedExtremist well-intentioned extremists]] who want to create a new reality without any of the flaws from the preexisting worlds]].

** ''VideoGame/SuperSmashBrosUltimate'' has Galeem [[spoiler: and later his counterpart, [[DarkIsEvil Dharkon]]]] as the BigBad of Adventure Mode. The [[LightIsNotGood Lord Of Light]] is an [[AngelicAbomination angelic]] creature who, like Tabuu, also has no dialogue and very little known motivations. Its EstablishingCharacterMoment is to wipe out all of the Fighters in the intro cutscene, with only [[Franchise/{{Kirby}} Kirby]] managing to survive.

* ''WesternAnimation/Ben10GeneratorRexHeroesUnited'', features the main Antagonist Alpha. Despite never having appeared before or since, he was made into a big player in the ''WesternAnimation/GeneratorRex'' world, having been Ceaser's original control nanite before the Omega. However, due to being unsustainable and too dangerous, he was banished to a parallel dimension, later revealed to be the Null Void. He manages to return to his homeworld, in search of a new body [[spoiler: but defeated by the combined efforts of Ben & Rex. He is sent back into the Null Void, trapped in a spherical form, though TheStinger shows him breaking free of his prison.]]

* The first crossover with IDW's ''[[ComicBook/TeenageMutantNinjaTurtlesIDW Teenage Mutant Ninja Turtles]]'' and ''[[ComicBook/GhostbustersIDW Ghostbusters]]'' series has Chi-You, a lost member of the Pantheon who ended up in the Ghostbusters' universe after the Turtles and their allies used a dimensional transporter. After both teams manage to trap him, he got sent into deep space back in the Turtles' universe, but he has yet to come back outside of a single mention.

* ''VideoGame/{{Battletoads}} & VideoGame/DoubleDragon'' involves a VillainTeamUp between The Dark Queen and the mysterious Shadow Boss, leader of the Shadow Gang. The former is the established BigBad of her series, but The Shadow Boss is a completely original character who never appeared anywhere else in the ''Double Dragon'' franchise.

* ''Film/GhidorahTheThreeHeadedMonster'' introduced the title character as this trope, an extraterrestrial threat so severe that he necessitated the crossover team-up of Franchise/{{Godzilla}}, Film/{{Mothra}}, and {{Film/Rodan}}. Unusual for this trope, however, Ghidorah would not end up as a simple one-off villain, and gradually became Godzilla's most iconic foe of all.

* ''WesternAnimation/CartoonAllStarsToTheRescue'': Characters from many popular cartoons such as WesternAnimation/BugsBunny, [[WesternAnimation/TeenageMutantNinjaTurtles1987 Michelangelo]], Series/{{Alf}}, WesternAnimation/AlvinAndTheChipmunks, [[WesternAnimation/DuckTales1987 Huey, Dewey, and Louie]], ComicStrip/{{Garfield}}, [[WesternAnimation/MuppetBabies1984 Baby Kermit, Baby Piggy, Baby Gonzo]], Franchise/WinnieThePooh, [[WesternAnimation/TheRealGhostbusters Slimer]], and Franchise/TheSmurfs, team up to convince a teenager, Michael, not to do drugs. The villain is a one-off character, Smoke, an anthropomorphic puff of smoke, trying to convince Michael that smoking is cool.

** Master Hand has been around since [[VideoGame/SuperSmashBros64 the first game]], and has appeared as the FinalBoss in every game after. Meanwhile, their counterpart Crazy Hand started appearing since ''VideoGame/SuperSmashBrosMelee'' either alone or helping Master Hand.

** ''VideoGame/SuperSmashBrosUltimate'' has Galeem [[spoiler: and later his counterpart, Dharkon]] as the BigBad of Adventure Mode. The [[LightIsNotGood Lord Of Light]] is an [[AngelicAbomination angelic]] creature who, like Tabuu, also has no dialogue and very little known motivations. Its EstablishingCharacterMoment is to wipe out all of the Fighters in the intro cutscene, with only [[Franchise/{{Kirby}} Kirby]] managing to survive.

* ''Franchise/KamenRider'' has too many of these to count, due to the yearly crossover movies starting in 2001.

! Examples

[[folder:Films - Animation]]

[[folder:Films - Live-Action]]

[[folder:Web Comics]]

That's when you bust out the ''Crossover-Exclusive Villain'', a completely new character who's role in the story is to be the ultimate villain.