History CrossOver / WesternAnimation

** And from the same season, recurring character Marissa Faireborne was obviously the daughter of Flint (Dashiell R. Faireborne) and Lady Jaye. The DVD commentary for ''WesternAnimation/TransformersTheMovie'' finally admitted this officially.

* ''WesternAnimation/AceVentura'' and ''WesternAnimation/TheMask'' crossed over on two episodes: the final episode of ''The Mask'' ("The Aceman Cometh") and the last episode of ''Ace Ventura'''s second season ("Have Mask, Will Travel").

* Creator/CartoonNetwork [[https://www.youtube.com/watch?v=Lt074nJUthI has done]] [[https://www.youtube.com/watch?v=aji96i_z7xE many promo spots]] [[https://www.youtube.com/watch?v=DZbmong_T44 for itself]] [[https://www.youtube.com/watch?v=Pzth7hcueTs using odd]] [[https://www.youtube.com/watch?v=H8WPmNYDtU0 and unusual crossovers]] such as Shaggy from ''Franchise/ScoobyDoo'' and Droopy Dog discussing what they call ''The Pound Puppies'' in France while driving a (live-action) convertible in (live-action) L.A., à la ''Film/PulpFiction''.

** The ''WesternAnimation/FamilyGuy'' episode "The Simpsons Guy" has the Griffins escaping from Quahog because of Peter making a sexist comic and end up in Springfield, where they meet and befriend the Simpsons. Then Homer and Peter start a fight (à la Giant Chicken) over which beer is better and nearly destroy Springfield.

*** The 2014 Treehouse of Horror did this directly, with the ''[[Series/TheTraceyUllmanShow Tracey Ullman Show]]'' counterparts appearing as ghosts. Furthermore, at the end of the segment, various versions of the Simpsons appear, including anime counterparts which parody ''One Piece'', ''Bleach'', ''Naruto'', ''Attack on Titan'', ''Pokémon'', and ''Spirited Away''. Other ones include Lego characters and Minions from ''Franchise/DespicableMe''.

* ''WesternAnimation/TheVentureBrothers'' started off as a parody of ''WesternAnimation/JonnyQuest''. Eventually, characters from ''Jonny Quest'' started showing up on the show... or at least demented versions of them.

** Earlier in the series, King Features had produced a film, ''WesternAnimation/TheManWhoHatedLaughter'', which featured a crossover of characters such as ComicStrip/{{Blondie}}, ComicStrip/BeetleBailey, ComicStrip/FlashGordon, ComicStrip/HiAndLois, ComicStrip/TheKatzenjammerKids, ComicStrip/MandrakeTheMagician, ComicStrip/ThePhantom, ComicStrip/{{Popeye}}, ComicStrip/PrinceValiant, and Snuffy Smith from the syndicate's various comic strips.

*** The Marvel cartoons from around this era were frequently cameo-ing in each other's series, as well (though it's hard to know whether they were the same characters as the other cartoons; they all take place in ''a'' MarvelUniverse, where ''a'' Spider-Man, Human Torch, etc. would likely exist somewhere.) You never know who'll be briefly shown watching from a rooftop, or looking up at the PillarOfLight in the distance when something ''really'' big goes down. Also, ComicBook/IronMan, ComicBook/FantasticFour, ComicBook/TheIncredibleHulk, etc. guest starred in each other's shows often enough to make the '90s Marvel cartoons a [[Franchise/DCAnimatedUniverse Diniverse]] of sorts - you can connect the dots through all of them.

*** The 2014 Treehouse of Horror did this directly, with the ''[[Series/TheTraceyUllmanShow Tracey Ullman Show]]'' counterparts appearing as ghosts. Furthermore, at the end of the segment, various versions of the Simpsons appear, including anime counterparts which parody ''One Piece'', ''Bleach'', ''Naruto'', ''Attack on Titan'', ''Pokémon'', and ''Spirited Away''. Other ones include Lego characters and Minions from ''WesternAnimation/DespicableMe''.

* [[WesternAnimation/SupermanTheAnimatedSeries Superman]] had three crossovers with ''WesternAnimation/BatmanTheAnimatedSeries'', confirming the existence of the Franchise/{{DCAU}}.

* ''WesternAnimation/UltimateSpiderMan2012'' met up with ''Series/{{Jessie}}'', a LiveActionTV series airing on Creator/DisneyChannel at the time. It featured the Wall-Crawler meeting with animated versions of the show's primary cast on Halloween and going up against Morgan Le Fay. Based on the latter cast's outfits, the crossover is set between the timeline of the latter's season 3 episodes "The Runaway Bride of Frankenstein" and "There Goes the Bride".

* [[WesternAnimation/AdventureTime Finn and Jake]] appeared on an episode of ''WesternAnimation/{{Futurama}}''.

* ''WesternAnimation/MiloMurphysLaw'' exists in a SharedUniverse with Dan Povenmire and Jeff "Swampy" Marsh's previous show, ''WesternAnimation/PhineasAndFerb'', and {{Easter Egg}}s are scattered around the show. In the [[Recap/MiloMurphysLawS1E34FungusAmongUs season one finale]], Milo, Dakota, and Cavendish meet Dr. Doofenshmirtz, and the [[Recap/MiloMurphysLawS2E1ThePhineasAndFerbEffect season two premiere]] is a full-blown crossover episode. It ends with Doofenshmirtz moving in with the Murphys indefinitely, and in the final minutes, Milo tells Phineas and Ferb that they live just across town from each other, so they can feel free to cross over whenever they like. [[SequelHook Phineas assures him they will.]]