History Main / BatFamilyCrossOver

* There are plans for this down the line in Film/SonysUniverseOfMarvelCharacters, since they only own the rights to Spider-Man, his supporting characters gallery, his rogues gallery and the heroes spun off from him.

* Franchise/TheDCU also had ''Trinity'', in which their three SpacePolice organisations, the Franchise/GreenLantern Corps, the Darkstars and [[Comicbook/{{Legion Of Super-Heroes}} L.E.G.I.O.N.]] had to work together against ancient Maltusian entities that predated the Guardians and Controllers.

* Whether it be ''VideoGame/MarioKart'', ''VideoGame/MarioParty'', or the plethora of sports titles based on the ''Videogame/SuperMarioBros'' series, you'll be sure they'll add some characters and settings from the ''VideoGame/DonkeyKongCountry'' series. In fact, [[WhatCouldHaveBeen they were planning to have Donkey Kong himself participate in]] ''[[{{Crossover}} Mario & Sonic at the Olympic Games]]'' (DK's model was ultimately DummiedOut, but he made it into the sequel). They also threw in ''VideoGame/{{WarioWare}}'' in these titles, though its representation is not as pronounced. All we got basically was art of Wario from the ''[=WarioWare=]'' series on the walls of ''Mario Power Tennis''[='=]s Wario Factory stage, and the Wario Bike in ''Mario Kart Wii'' -- none of Wario's supporting cast from the ''[=WarioWare=]'' series has actually shown up in these games yet. With that said, ''[[VideoGame/DrMario Dr. Mario 64]]'' features almost every character that appeared in ''VideoGame/WarioLand3''. This makes it one of the few times where Mario gets the chance to appear alongside characters that originated from the Wario games.
** We could add ''Videogame/WiiSportsResort'' into the mix since Wuhu Island ends up having not one, but ''two'' courses in Mario Kart 7 (one of which features assets from both Wii Sports and Pilotwings), as well as a battle arena dedicated to a portion of the island.
* The ''VideoGame/StreetFighterAlpha'' prequel series formally introduced the ''VideoGame/FinalFight'' cast to Franchise/StreetFighter with the addition of Guy and Sodom in the first entry, followed by Rolento in ''Alpha 2'' and Cody in ''Alpha 3''. There's even an entire stage in both ''Alpha 2'' and ''Alpha 3'' featuring the rest of the ''Final Fight'' cast cheering on the fight. The ''VideoGame/StreetFighterIII'' series added another ''Final Fight'' alumni to the roster with the addition of Hugo (formerly known as Andore) in ''[=2nd Impact=]'' and Poison appears as playable fighter in ''VideoGame/StreetFighterXTekken'' and ''Ultra VideoGame/StreetFighterIV'' after having a passive role as Hugo's manager in ''III''. Recently, Abigail has been added to the roster of ''VideoGame/StreetFighterV'', with Lucia coming later afterwards.

* ''Comicbook/{{Shadowland}}'' did this for Marvel's street-level heroes, such as ComicBook/{{Daredevil}}, ComicBook/{{Luke Cage|HeroForHire}} and ComicBook/ThePunisher.

* ''[[ComicBook/StarWarsWarOfTheBountyHunters War of the Bounty Hunters]]'' is a 2021 crossover event between all of the then-concurrent Franchise/StarWarsExpandedUniverse comic titles being published by Marvel -- ''ComicBook/StarWarsMarvel2015'', ''ComicBook/StarWarsDarthVader2020'', ''ComicBook/StarWarsBountyHunters'', and ''ComicBook/StarWarsDoctorAphra'' -- as well as several miniseries and oneshots, all built around the fight between various factions over the block of carbonite containing Han Solo.

* "ComicBook/ThroneOfAtlantis": a crossover between ''Justice League'' and ''Aquaman'' which chronicles an invasion of the surface world by Aquaman's brother, Ocean Master, and the forces of Atlantis.

* ''[[ComicBook/StarWarsWarOfTheBountyHunters War of the Bounty Hunters]]'' is a 2021 crossover event between all of the then-concurrent Franchise/StarWarsExpandedUniverse comic titles being published by Marvel -- ''ComicBook/StarWarsMarvel2015'', ''ComicBook/DarthVader2020'', ''ComicBook/StarWarsBountyHunters'', and ''ComicBook/StarWarsDoctorAphra'' -- as well as several miniseries and oneshots, all built around the fight between various factions over the block of carbonite containing Han Solo.

* "ComicBook/TrinityWar" has the ''[[Franchise/JusticeLeagueOfAmerica Justice League]]'', ''[[ComicBook/JusticeLeagueOfAmerica2013 Justice League of America]]'', and ''ComicBook/JusticeLeagueDark'' involved in a confrontation between the Trinity of Sin: [[ComicBook/TrinityOfSinPandora Pandora]], ComicBook/ThePhantomStranger, and ComicBook/TheQuestion.

** However, the 2018 ''All Stars Memories'' movie features all ''55'' main Cures up to that point, spanning all 15 seasons from ''Anime/FutariWaPrettyCure'' to ''Anime/HugttoPrettyCure''; it holds a Guinness World Record for "most magical warriors in one anime film". The main ''Hugtto!'' series did its own crossover which features even more characters on top of that, bumping the number to over 60.

* The ''Anime/PrettyCureAllStars'' movies. Eight have been made, with the last uniting ''thirteen seasons/eleven teams'' of magical girls for a grand total of ''43'' (plus one OriginalGeneration character).
** Thanks to the fact that the franchise kept going, All Stars eventually had to be discontinued and replaced by Dream Stars, which restricts the represented teams to the most recent 3.

*** A short crossover, "ComicBook/LightsOut", happened in October 2013. It started in ''Green Lantern'', ran through ''ComicBook/GreenLanternCorps'', ''Green Lantern: New Guardians'', and ''ComicBook/RedLanterns'' before concluding in the second ''Green Lantern'' annual. It involved the Lantern corps coming together to stop an ancient being named Relic.

* There was talk of doing one of these for ''Series/LawAndOrder'', ''Series/LawAndOrderSpecialVictimsUnit'', and ''Series/LawAndOrderCriminalIntent'' when the latter launched, with all three shows investigating a potential terrorist attack on New York City from different angles. [[TooSoon And then 9/11 happened.]]

* ''VideoGame/JoJosBizarreAdventureEyesOfHeaven'' features an original storyline in which every [=JoJo=] from parts 1-8 team up to take down DIO after he succeeds in [[AscendToAHigherPlaneOfExistence "obtaining Heaven"]] and gains nigh-unstoppable cross-timeline RealityWarper powers.

[[folder:Web Original]]
* The ''Roleplay/GlobalGuardiansPBEMUniverse'' features a lot of these, especially when two campaigns were operating out of the same city.
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* The vast majority of the various Comicbook/XMen crossovers are {{Bat Family Crossover}}s, as they seldom have any effect on anyone but the various groups of mutants that appear in them. (For example, the majority of the stories involving the alien Phalanx.) The "X-Overs" are actually an every-year-or-so tradition, and tend to have lasting effects (such as Apocalypse's introduction and Angel's transformation into Archangel in "Fall of the Mutants," and Generation X's creation in "Phalanx Covenant.")

* ''VideoGame/YukiYunaIsAHeroHanayuiNoKirameki'' is a mobile crossover where various Heroes from ''Franchise/YuushaDeAru'' come together to fight Vertexes.

* The ''VideoGame/StreetFighterAlpha'' prequel series formally introduced the ''VideoGame/FinalFight'' cast to Franchise/StreetFighter with the addition of Guy and Sodom in the first entry, followed by Rolento in ''Alpha 2'' and Cody in ''Alpha 3''. There's even an entire stage in both ''Alpha 2'' and ''Alpha 3'' featuring the rest of the ''Final Fight'' cast cheering on the fight. The ''VideoGame/StreetFighterIII'' series added another ''Final Fight'' alumni to the roster with the addition of Hugo (formerly known as Andore) in ''[=2nd Impact=]'' and Poison appears as playable fighter in ''VideoGame/StreetFighterXTekken'' and ''Ultra VideoGame/StreetFighterIV'' after having a passive role as Hugo's manager in ''III''. Recently, Abigail has been added to the roster of ''VideoGame/StreetFighterV'', with Poison and Lucia coming later afterwards.

* The ''VideoGame/StreetFighterAlpha'' prequel series formally introduced the ''VideoGame/FinalFight'' cast to Franchise/StreetFighter with the addition of Guy and Sodom in the first entry, followed by Rolento in ''Alpha 2'' and Cody in ''Alpha 3''. There's even an entire stage in both ''Alpha 2'' and ''Alpha 3'' featuring the rest of the ''Final Fight'' cast cheering on the fight. The ''VideoGame/StreetFighterIII'' series added another ''Final Fight'' alumni to the roster with the addition of Hugo (formerly known as Andore) in ''[=2nd Impact=]'' and Poison appears as playable fighter in ''VideoGame/StreetFighterXTekken'' and ''Ultra VideoGame/StreetFighterIV'' after having a passive role as Hugo's manager in ''III''. Recently, Abigail has been added to the roster of ''VideoGame/StreetFighterV''.

* With the collapse of the territory system, many professional wrestling promotions have opened up or contracted smaller promotions to act as "farm leagues" to train new talent for their rosters. Since this often results in "developmental" losing its biggest money makers, the larger and often more popular promotion will loan some members of its own roster to help the smaller one keep crowds interested. Wrestling/{{WCW}} had the Heartland Wrestling Association for instance and gave national exposure to some of its stars, such as Shark Boy. Wrestling/{{Chikara}} meanwhile has its "Wrestling IS" affiliates, one of which (RESPECT) used to be a showcase for Wrestling/RingOfHonor and Wrestling/{{SHIMMER}} trainees.

[[quoteright:350:[[ComicBook/SpiderVerse https://static.tvtropes.org/pmwiki/pub/images/4536862_01.jpg]]]]

** ''ComicBook/BatmanNoMansLand''. Franchise/{{Superman}} did make two appearances, but left both times after being shown that he was useless in a situation like the one Gotham was in at that point.
*** Never mind that they had just fixed Metropolis recently in his own series.

** One of the older examples was the multi-part arc that crossed over between ''Batman'' and ''Detective Comics'' in 1983 in which Killer Croc and Jason Todd were both introduced.
*** Actually, Batman and Detective were inter-connected for the last several years pre-Crisis. The Nocturna arc is probably the best example of this, as it lasted for almost a dozen issues right before COIE.

* ''VideoGame/JojosBizarreAdventureEyesOfHeaven'' features an original storyline in which every [=JoJo=] from parts 1-8 team up to take down DIO after he succeeds in [[AscendToAHigherPlaneOfExistence "obtaining Heaven"]] and gains nigh-unstoppable cross-timeline RealityWarper powers.

* Sometimes a promotion will have multiple branches, each with their own champions and angles. The International Wrestling Association was Puerto Rican but also had a popular Japanese branch and would bounce wrestlers between the two. Wrestling/UltimoDragon's Toryumon was largely Mexican based but had a Japanese branch, which eventually became Wrestling/DragonGate and went on to set up branches in the USA and UK, who it would rotate talent through.

* While there are plenty of cross promotional events in pro wrestling that do not qualify, sometimes promotions will establish widespread, long term alliances that create a lasting continuity between them. Wrestling/{{N|ational Wrestling Alliance}}WA Showtime All-Star Wrestling and NWA Smokey Mountain doing a joint event, for instance, as the NWA members acknowledge the same champions and have a say in the NWA's general direction. Similar cases include the World Wrestling Network (EVOLVE, Full Impact Pro, etc), Global Pro Wrestling Alliance (Wrestling/ProWrestlingZero1, Wrestling/ProWrestlingNoah, etc) and World Wrestling League (Wrestling/{{CMLL}}, Wrestling/{{TNA}}, ect).

* Some promotions act as "parents" in order to others, such as when Wrestling/DramaticDreamTeam experimented with two "child" Joshi promotions, TJP and Union Pro, in the 2010s.[[/folder]]