History Main / CanonWelding

** The ''WebVideo/LifeSMP'' is canon to ''Empires'' on multiple levels, via PastLifeMemories of 3rd Life leading to a ReincarnationRomance in Season 1, and shared memories of Double Life being present in the character dynamics of Season 2.

** Years before the "Simpsorama" episode, the [[ComicBook/TheSimpsons Simpsons comics]] already had a crossover with the cast of ''Futurama'', ''ComicBook/TheSimpsonsFuturamaCrossoverCrisis''and a sequel comic. However, since the comics seem to be their own weird little conitnuity, the later TV crossover completly ignores that story line.

* WordOfGod stated that ''WesternAnimation/MiloMurphysLaw'' was in the same universe as ''WesternAnimation/PhineasAndFerb'' from the beginning, but the shows have become more closely joined as the former goes on, with the eventual reveal that [[spoiler:Doofensmirtz is destined to invent the TimeTravel technology that Cavendish and Dakota use]]. ''WesternAnimation/HamsterAndGretel'' was also confirmed via Word of God to take place in the same continuity. So far, this is only confirmed by a quick non-speaking [[TheCameo cameo]] by Doofenschmirtz in the episode "Strawberry Fest Forever".

** A blink-and-you-miss-it frame in Futurama's season 8 ChristmasEpisode "[[Recap/FuturamaS8E6IKnowWhatYouDidNextXmas I Know What You Did Next Xmas]]" featuring Bean, Elfo ans Luci from ''WesternAnimation/{{Disenchantment}}'', a third animated series from the mind of Creator/MattGroening, seems to confirm the latter show takes place in the former show's future.

* WordOfGod stated that ''WesternAnimation/MiloMurphysLaw'' was in the same universe as ''WesternAnimation/PhineasAndFerb'' from the beginning, but the shows have become more closely joined as the former goes on, with the eventual reveal that [[spoiler:Doofensmirtz is destined to invent the TimeTravel technology that Cavendish and Dakota use]].

* The UrExample was Creator/ArchieComics, with their crossover story featuring the Shield and the Wizard, way back when they were still MLJ Comics. Both act as though they'd heard of the other before, establishing their stories as set in the same universe. It was also an early eample of a true comic book crossover, as it ran through the pages of both the Top Notch Comics and Pep Comics mags.

** There was also [[Recap/HerculesTheAnimatedSeriesS1E44HerculesAndTheArabianKnight an episode]] of ''WesternAnimation/HerculesTheAnimatedSeries'' in which Jafar and Hades cut a deal to eliminate each other's enemies, resulting in an ''WesternAnimation/AladdinTheSeries'' crossover.

** There was also an episode of ''WesternAnimation/HerculesTheAnimatedSeries'' in which Jafar and Hades cut a deal to eliminate each other's enemies, resulting in an ''WesternAnimation/AladdinTheSeries'' crossover.

** Thanks to the ''WesternAnimation/FamilyGuy'' episode "The Simpsons Guy", it can now be said that ''WesternAnimation/TheSimpsons'' takes place in the same universe as the aforementioned Creator/SethMacFarlane cartoons.

** A blink-and-you-miss-it frame in Futurama's season 8 ChristmasEpisode "I Know What You Did Next Xmas" featuring Bean, Elfo ans Luci from ''WesternAnimation/{{Disenchantment}}'', a third animated series from the mind of Creator/MattGroening, seems to confirm the latter show takes place in the former show's future.

** The scariest part of that link? ''The X-Files'' crossed over with ''Series/{{Cops}}'', a reality show, meaning that all those shows take place in our universe.

* WesternAnimation/TheLegoBatmanMovie takes place in a continuity where ''all'' the previous ''Batman'' movies, TV show appearances and comics happened, including the 1966 Creator/AdamWest show, ''WesternAnimation/BatmanTheAnimatedSeries'', the ''WesternAnimation/SuperFriends'' cartoon, and the comic story lines going all the way back to the 1930s. In one scene, Alfred connects a ''lot'' of movies to this one in one line of dialogue.

* ''WesternAnimation/TheLegoBatmanMovie'' (2017) takes place in a continuity that includes ''all'' of Franchise/{{Batman}}'s prior film appearances.
-->'''Alfred:''' Sir, I've seen you go through similar phases in [[Film/BatmanVSupermanDawnOfJustice 2016]], and [[Film/TheDarkKnightRises 2012]], and [[Film/TheDarkKnight 2008]], and [[Film/BatmanBegins 2005]], and [[Film/BatmanAndRobin 1997]], and [[Film/BatmanForever 1995]], and [[Film/BatmanReturns 1992]], and [[Film/Batman1989 1989]], and that weird one in [[Film/BatmanTheMovie 1966]].\\
'''Batman:''' I have aged ''phenomenally''.

* ''WesternAnimation/{{SCOOB!}}'' was intended to kick-off an [[SharedUniverse animated cinematic universe]] based on the Creator/HannaBarbera cartoons (see also the Western Animation section below) with this movie based on the Franchise/ScoobyDoo property but featuring Dick Dastardly from WesternAnimation/WackyRaces as the villain and also introducing Blue Falcon and WesternAnimation/{{Dynomutt|Dog Wonder}} as major characters. WesternAnimation/{{Captain Caveman|And The Teen Angels}} also appears.

* ''WesternAnimation/{{Scoob!}}'' was intended to kick-off an [[SharedUniverse animated cinematic universe]] based on the Creator/HannaBarbera cartoons (see also the Western Animation section below) with this movie based on the Franchise/ScoobyDoo property but featuring Dick Dastardly from WesternAnimation/WackyRaces as the villain and also introducing Blue Falcon and WesternAnimation/{{Dynomutt|Dog Wonder}} as major characters. WesternAnimation/{{Captain Caveman|And The Teen Angels}} also appears.

* ''Film/SpiderManNoWayHome'': The movie involves characters from alternate universes being pulled into the [[Franchise/MarvelCinematicUniverse Marvel Cinematic Universe]] -- specifically, villains from the [[Film/SpiderManTrilogy Sam Raimi Spider-Man trilogy]] and the [[Film/TheAmazingSpiderManSeries Amazing Spider-Man movies]], making those two movie universes part of the greater MCU-established multiverse. [[spoiler: The post-credit scene of this movie and ''Film/VenomLetThereBeCarnage'' also makes that incarnation of ComicBook/{{Venom}} and Film/SonysSpiderManUniverse part of the larger MCU Multiverse.]]

* ''Webcomic/HeroesUnite'' did it with a horrifying amount of SuperHero {{webcomic}}s, hosted on Platform/DrunkDuck. First it established that ''Webcomic/{{Energize}}'', ''Bombshell,'' and an alternate counterpart of ''Webcomic/{{Acrobat}}'' share an universe, and then a bunch of other superheroes joined in. Some writers even took an advantage of it to make their webcomics more popular. The creators of ''Webcomic/{{Energize}}'' and ''Webcomic/{{Dasien}}'' did a short (currently on hiatus) crossover between their characters, while the former used a new SharedUniverse to bring back his other {{webcomic}}s - ''Fearless'', Webcomic/{{SHELL}} teamed up with The Blonde Marvel and Bombshell and gets his ass kicked by one of Webcomic/HeroForce members before joining HU, and Vora, Princess Of The Skies, appeared a few times in HU before getting her own adventures. And it's all one reality in TheMultiverse of the {{webcomic}}s. Having kickstarted the whole superhero crossover thing on Platform/DrunkDuck, ''Webcomic/HeroesUnite'' is now set in its own self-contained universe, but the crossover goodness continues in the spinoff ''Heroes Alliance'' with the characters from ''Webcomic/KarabearComicsUnlimited'' and even involved MediaNotes/JennyEverywhere and golden age characters like Madame Fatal.

** ''Anime/DragonBallSuper'' is an odd example, since while it's specifically meant to be a sequel to the original ''Dragon Ball'' manga rather than the anime, various anime-only {{Filler}} moments get directly referenced. Gregory, an anime-only character, is present, Android 18 gets pissed when 17 accidentally calls Marron "Maron", Krillin's girlfriend from the Garlic Jr. filler arc of ''Anime/DragonBallZ'', and when Krillin is surrounded by ghosts of the various villains they've fought over the series, [[FreakyFridayFlip Captain Ginyu in Bulma's body]] also appears, something that also never happened in the manga. On the other hand, Gohan at one point talks to a group of bus hijackers he stopped in the manga, but not the anime, and various continuity errors, such as the different depictions of hell in the ''Z'' anime and ''Super'' exist if one tries to connect them directly.
*** That is probably not Ginyu in Bulma's body. Krillin commented that he finds Bulma scarier than Frieza.

** Izzy's clone Kirsty and her husband Lucian are explicitly stated by WordOfGod to be the parents of the protagonist of his previous comic, ''[[http://rainbowskiesforever.thecomicseries.com/ Rainbow Skies Forever]]'', but WordOfGod also states that ''Ennui GO!'' is an AlternateUniverse.

* ''Webcomic/HeroesUnite'' did it with a horrifying amount of SuperHero {{webcomic}}s, hosted on Website/DrunkDuck. First it established that ''Webcomic/{{Energize}}'', ''Bombshell,'' and an alternate counterpart of ''Webcomic/{{Acrobat}}'' share an universe, and then a bunch of other superheroes joined in. Some writers even took an advantage of it to make their webcomics more popular. The creators of ''Webcomic/{{Energize}}'' and ''Webcomic/{{Dasien}}'' did a short (currently on hiatus) crossover between their characters, while the former used a new SharedUniverse to bring back his other {{webcomic}}s - ''Fearless'', Webcomic/{{SHELL}} teamed up with The Blonde Marvel and Bombshell and gets his ass kicked by one of Webcomic/HeroForce members before joining HU, and Vora, Princess Of The Skies, appeared a few times in HU before getting her own adventures. And it's all one reality in TheMultiverse of the {{webcomic}}s. Having kickstarted the whole superhero crossover thing on Website/DrunkDuck, ''Webcomic/HeroesUnite'' is now set in its own self-contained universe, but the crossover goodness continues in the spinoff ''Heroes Alliance'' with the characters from ''Webcomic/KarabearComicsUnlimited'' and even involved MediaNotes/JennyEverywhere and golden age characters like Madame Fatal.

** When ''WesternAnimation/TheFlintstones'' came along they got in on the fun too. Yogi even showed up in person in one episode (despite being name dropped as a tv show before). When the Flintstones went to the then-present Officer Dibble from ''WesternAnimation/TopCat'' could be seen and when they went into the future it used the same design from ''WesternAnimation/TheJetsons''.

*** Speaking of ''Supergirl'' (see above), this series was for it's first four season part of the multiverse, but toke place on [[AlternateUniverse Earth-38]] with crossovers having to involve some [[DimensionalTravel dimension hopping]]. After the events of ''Crisis'' however Supergirl was now integrated into the Arrowverse's retooled main continuity going forward.

* ''Webcomic/HeroesUnite'' did it with a horrifying amount of SuperHero {{webcomic}}s, hosted on Website/DrunkDuck. First it established that ''Webcomic/{{Energize}}'', ''Bombshell,'' and an alternate counterpart of ''Webcomic/{{Acrobat}}'' share an universe, and then a bunch of other superheroes joined in. Some writers even took an advantage of it to make their webcomics more popular. The creators of ''Webcomic/{{Energize}}'' and ''Webcomic/{{Dasien}}'' did a short (currently on hiatus) crossover between their characters, while the former used a new SharedUniverse to bring back his other {{webcomic}}s - ''Fearless'', Webcomic/{{SHELL}} teamed up with The Blonde Marvel and Bombshell and gets his ass kicked by one of Webcomic/HeroForce members before joining HU, and Vora, Princess Of The Skies, appeared a few times in HU before getting her own adventures. And it's all one reality in TheMultiverse of the {{webcomic}}s. Having kickstarted the whole superhero crossover thing on Website/DrunkDuck, ''Webcomic/HeroesUnite'' is now set in its own self-contained universe, but the crossover goodness continues in the spinoff ''Heroes Alliance'' with the characters from ''Webcomic/KarabearComicsUnlimited'' and even involved WebOriginal/JennyEverywhere and golden age characters like Madame Fatal.

* WebVideo/DreamSMP has done this on multiple occasions, most notably when Jschlatt confirmed that the older server ''WebVideo/SMPLive'' is at least ''partially'' canon, and when Nihachu confirmed that her character travels between Dream SMP and the otherwise unrelated ''Bear SMP''.
* A [=YouTuber=] named [=PopularMMOs=] has a series called ''The Crafting Dead''. In the third season, he puts Dr. Trayaurus of [[LetsPlay/DanTDM TheDiamondMinecart]] fame into the series. Before him, he puts Captain Cookie, from Epic Proportions, another series by the [=YouTuber=], became part of the story.

** Schlatt retroactively confirms that [=SMPLive=] is at least ''partially'' canon to ''WebVideo/DreamSMP'' in an episode of Tales from the SMP. This indirectly connects it to ''WebVideo/BearSMP'' as well, and WebVideo/MinecraftChampionship, both of which are canonical to ''Dream SMP''.

*** Also, Dr. Curt Connors went to college with [[spoiler:Doctors Baxter Stockman and Otto Octavius]].

** [[spoiler:Bebop and Rocksteady]] work for Norman Osborn (as he and Miles Warren were the ones to give him his respective powers.

** Also, Dr. Curt Connors went to college with [[spoiler:Doctors Baxter Stockman and Otto Octavius]].

** The BPRD now includes Zatanna, John Constantine, Jason Blood/Etrigan, Detective Chimp, and Stanley Ipkiss/The Mask (the Mask itself being a creation of Thor's brother Loki). In later books, they are joined by FrankensteinsMonster(the DC version from ComicBook/SevenSoldiersOfVictory) and Jack Russell, the ComicBook/WerewolfByNight.

* The fanfic ''Fanfic/SpiderNinja'' specifically states that it's story takes place in a part of the Spider-Verse where a [[GenderFlip Gender Flipped]] Peter Parker was adopted by Master Splinter after her birth family was killed. The story technically does this trope to both franchises, as Petra Parker (while getting her powers [[InSpiteOfANail the same way Peter Parker did]]) lives a completely different life from most Spider-Man incarnations. Similarly, the story welds together the 2003 series (using the same locations and characterizations) and the 1987 series (Splinter is the mutated Hamato Yoshi and April is a reporter).