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Canon Welding
aka: Inevitable Crossover

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"They were independent, separate stories. But now...the stories are combining, that's why the worlds are becoming one."

When an author or creator takes two previously unrelated works and puts them into a single, shared continuity.

Sci-fi and fantasy authors don't always write all their novels in the same continuity. A budding new author's first published book might be about space pirates in the 27th century, while his sophomore effort might instead be about 21st century scientists reverse-engineering a flying saucer. In response to popular demand, he might end up writing a sequel to one, or even both of these novels. Flash forward about 20 years — the author has grown wealthy from writing stories about Captain Flash Orangebeard and Dr. Smith of Mars, but he's running out of ideas and the two long-running series are in danger of getting stale. What does he do to keep the public's interest, and breathe new life into the storylines?


Combine them!

Many long-lived genre authors tend to resort to Canon Welding, usually at a later point in their career. They combine two or more distinct series they've created into a single continuity. This isn't just a one-off Crossover; for series with radically different premises, the foundations of one or both stories can be altered forever.

By combining the two series together, the author can introduce fans of one series to characters they may not be familiar with, inducing them to go out and buy the works in that series, and hopefully attract high sales from fans of both storylines. When done well, it can add a more epic feel to the tale, explore aspects of the two storylines not previously delved into, and make lots of money for the author and his publisher (and there are many examples of this, perhaps most famously The Lord of the Rings). When done poorly, especially with stories with radically different settings or styles, it looks and feels like a shallow money-grab and can potentially be a shark-jumping moment for both series.


Modular Franchise is when it's done at a corporate level. When this is done by fans, it becomes either a Patchwork Fic if all of the components are part of a single Franchise or one variety of Fusion Fic if they are not. Compare Shared Universe, which can be created through Canon Welding if it wasn't shared from the beginning.

For the fanon equivalent of this trope, see Fanon Welding. Not to be confused with welding artillery.


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    Anime & Manga 
  • Manga creator Go Nagai does this often with his various works, although Mazinger Z and UFO Robo Grendizer were already part of one continuity from Grendizer's get-go.
    • Shin Mazinger is quickly reaching a critical level of this, with a woman from Violence Jack turning out to be Kouji Kabuto's mother.
    • Violence Jack has incorporated Devilman and later Devilman Lady as taking place in one Universe that resets itself and all main characters are really incarnations of Akira Fudou. And because the series is also Deconstructor Fleet for all other Go Nagai's manga, there are many theories incorporating them into it in all incarnations, which is possible thanks to the nature of this world. Cameos and crossovers between his works are so often it's pretty easy. Then there's Devilman Grimoire, where Jun Fudo and Aoi Kurosaki from Devilman Lady are shown to be teachers at Akira and Miki's school. They are also lovers. Alphonse and Himura, from the 1970s Devilman anime series, also feature.
  • Gosho Aoyama's three main works Case Closed, Magic Kaito, and Yaiba!, have the tendency to merge into one universe. Magic Kaito was more or less put on hold in favor of Case Closed, but its characters occur so frequently in Case Closed to be the latter's recurring characters. Although, Aoyama also drew the line: Case Closed does not deal with Magic Kaito characters in their civvies.
  • The Gundam franchise started off with only the Universal Century timeline under the auspices of creator Yoshiyuki Tomino. When he stepped away from the franchise in 1993, Sunrise introduced the concept of Alternate Universes to allow new creators to explore their vision of Gundam without creating a Continuity Snarl, resulting in the Future Century, After Colony, and After War timelines. Then Tomino returned for the 20th anniversary and created ∀ Gundam, set in the Correct Century timeline, which was eventually revealed to be the Distant Finale of all of Gundam, including the AUs. Afterwards came more Alternate Universes (Cosmic Era, Anno Domini, Advanced Generation, and Post Disaster), with Word of God confirming that they're part of the timeline created by Turn A as well. Tomino's latest work, Gundam: Reconguista in G, takes place in the Regild Century timeline, which is explicitly stated in-series as being the era that came after the end of the Universal Century. The sole exception to the rule is Gundam Build Fighters, which takes place in a 20 Minutes into the Future setting where Gundam is a popular anime franchise. Presumably the same applies to Model Suit Gunpla Builders Beginning G, which is Build Fighters' spiritual precursor. Additionally, the non-canon manga Gundam vs. Ideon: Counterattack of Gigantis reveals that the Universal Century timeline was the new universe created after the destruction of the previous universe at the end of Space Runaway Ideon, another Tomino series.
  • The mangaka group CLAMP has been known for self-crossovers for many years, but their twin series Tsubasa -RESERVoir CHRoNiCLE- and ×××HOLiC are meant to tie all their works—both present-day and fantasy—into a single continuity.
  • Pretty Cure All Stars. 14 magical girls from 4 different continuities save the day. Awesome.
    • The second All Stars-movie features 17 magical girls from 5 different continuities. From the previews it seems to feature some of the different baddies, too.
      • All Stars DX 3 ups the number to 21 from 6 continuities and the brand-new New Stage brings it to a grand total of 28 from 7. It overlaps with Remember the New Guy? as a lot of Cures that show up in one movie weren't in the movie before that.
      • All Stars New Stage delivers a Retcon of sorts now stating that 23 magical girls from 6 different continuities saved the day. Then 5 more from the 7th hopped in and it was madness.
    • Interestingly, it seems that Smile Pretty Cure! is attempting a bit of a Canon Weld experiment themselves - an episode midway through reveals that Yayoi's mother works for Fairy Drop, the store owned by Erika Kurumi's mother. And said mother is mentioned, at least by last name.
  • Eiichiro Oda re-used Ryuuma, a character from his one-shot manga Monsters, as a (zombified) villain in One Piece and his home country was mentioned to be part of the New World (the second half of the Grand Line). He later confirmed that Monsters was incorporated into the backstory of the setting.
  • Negima! Magister Negi Magi reveals that all of Ken Akamatsu's major works exist in the same universe. The ties between Negima and Love Hina are obvious with Setsuna being a Shinmeiryuu swordswoman, which is lead by the Aoyama family from Love Hina; the reference to A.I. Love You is found in a single panel, although it's kinda important, as the protagonist of that series is implied to have written the code that enables Chachamaru to have a soul.
  • Dragon Ball:
    • Before he gave the world Dragon Ball, Akira Toriyama's first popular series was a comedy called Doctor Slump, about a robot girl and the slob scientist who created her causing havoc in a weird place called Penguin Village. About a year into the Dragon Ball series, Toriyama had Goku visit Penguin Village and meet most of the Slump cast, thus joining the two series into one universe. This was mostly done as an attempt to use Dr. Slump's popularity to help increase readership of Dragon Ball, as it wasn't the huge hit it would eventually become yet. In contrast, the crossover has had the opposite effect in later years: many fans, especially outside of Japan, only know the Dr. Slump cast because of their guest spot on Dragon Ball. It's gotten to the point that Arale's made it into at least three Dragon Ball video games as a playable character! Dragon Ball Z: Budokai Tenkaichi 3, Dragon Ball Origins and Revenge of King Piccolo, to be precise. The first one also caused a good amount of rejoicing for those who knew her.
    • The Akira Toriyama manga Pola and Roid, Tomato, Girl Detective and Wonder Island connect to Dr. Slump through cameos. The manga Dub and Peter 1, Escape, Go! Go! Ackman, Kajika, Kintoki, Nekomajin/Nekomajin Z, and Sand Land might all take place in the Dragon Ball universe (Galactic Patrol of Jaco the Galactic Patrolman, Jiya and Sachie-chan Guu!! fame is confirmed to take place due to its ending).
    • Dragon Ball Super 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 Dragon Ball Z, and when Krillin is surrounded by ghosts of the various villains they've fought over the series, 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.
  • The canons of Tsukihime, Fate/stay night (plus others) are generally grouped together and called the Nasuverse. There's rarely direct crossover of the characters, except in spin-off games and non-canonical side-comics. Word of God on each canon's characters respective power levels in relation to each other (can Shiki kill Servants?) is conflicting. Even better: it is canonical in the series that alternate timelines exist in which different events took place, and that travel between them is possible (albeit extremely difficult, this being the Second Magic), so it can be said that all routes of all materials are canonical in one universe or another. Except The Garden of Sinners which, by Word of God, explicitly isn't in the same universe as Tsukihime.
  • Leiji Matsumoto is notorious for this, with Galaxy Express 999, Captain Harlock, Queen Millennia, and Space Battleship Yamato crossing over to various degrees, not always following a consistent continuity.
  • Endings of Getter Robo Armageddon and New Getter Robo in which Armageddon versions of Ryoma, Hayato and Benkei and New version of Ryoma ends in Warrior Heaven, alongside countless Getters, fighting unknown monsters has hinted that all Getter's separated continuities (two mentioned above, Ken Ishikawa's manga continuity, Getter Robo DASH manga and anime Getter Robo Go and Shin Getter Robo Vs Neo Getter Robo) might exist in the same Multiverse.
  • Madhouse Studios anime adaptations of four Marvel Comics' titles - X-Men, Iron Man, Wolverine and Blade - are set in one Universe, confirmed both by Word of God from Marvel and the same Wolverine appearing in all four anime.
  • GaoGaiGar FINAL has blink-and-you'll-miss-it cameos of characters from Betterman, establishing those two series takes place in one Universe.
  • REDLINE does this by making main characters from two different anime - Miki and Todoroki from Mole Brothers and Trava and Shinkai from Trava First Planet - participating in the eponymous race.
  • Several years ago, Hidenori Kusaka and Satoshi Yamamoto worked on a short Pokémon Ranger manga that was only released online. As it turns out in the Platinum arc of Pokémon Adventures, the events that occured in that online comic are indeed canonical. The Ranger story was later included in an Adventures art book.
  • Time Bokan:
    • Yatterman Night has the cast encountering characters (or in some case, blatant Expies)) from various other shows produced by Tatsunoko Production. One episode even has Galina and Alouette driving the Mach 5!
    • This seems to be tradition for Yatterman: the original and 2008 series crossed over with several Tatsunoko shows, and even placed them in a "Tatsunoko Kingdom" where all Tatsunoko characters appeared to reside in during one OVA.
  • Eiji Ohtsuka has demonstrated that his horror manga MPD Psycho and The Kurosagi Corpse Delivery Service share a continuity thanks to the character Sasayama, who appears as a police officer in the former and as a social worker, at a later stage of his life, in the latter.
  • Before High School D×D, Ishibumi wrote the first iteration of SLASHDØG which flopped and never went past the first volume. However, he did bring in Tobio Ikuse first as a Canon Immigrant in Volume 15 on 2013, a year later he went and rewrote SLASHDØG and properly placed in the same universe as DxD, birng along Grauzauberer and Akeno's extended family and properly developed it into The 'Verse by adding a character from his first and most obscure work, Denpachi.
  • City Hunter: Shinjuku Private Eyes confirms that the series exists in the same universe as Cat's Eye, with the three Kisugi sisters turning out to be the true owners of the cafe that Umibozu and Miki run.

    Comic Books 
  • The DC and Marvel universes were born from this trope; originally, the titles published by each company did not overlap, but over time, cameos, Crossovers, and inside references combined to form the comic books into one big, interconnected web. That's not even counting the Amalgam universe. Since DC vs. Marvel in 1996, it's revealed all crossovers were canonical — more or less. note 
    • Mind, Marvel started this with the first issue of Spider-Man. And even before that, Marvel started this 21 years earlier in the Timely Comics era, when Human Torch faced off against Namor the Sub-Mariner for the first time. They teamed a few more times over the next few years, and some of the less prominent characters occasionally got involved. Then, in 1946, Timely launched the All-Winners Squad, teaming up existing characters like Captain America, the Human Torch, and the Sub-Mariner (among others).
    • DC started it in All-Star Comics #3 with the Justice Society's first meeting. To this day, it's generally accepted that the Justice Society is the first-ever example of a super hero team lasting longer than a single issue in comics history.
    • DC has also historically made a habit of assimilating the characters of other comics companies into their multiverse - Quality Comics (Uncle Sam and the Freedom Fighters, Plastic Man, Blackhawk), Fawcett Comics (Shazam, Captain Marvel and the Marvel Family), Charlton Comics (Captain Atom, Blue Beetle, The Question), Wild Storm (The Authority, Wild CATS), Milestone Comics (Icon, Hardware, Static) and Archie Comics' Red Circle superhero characters. Generally, these characters start off in alternate universes, and then some sort of universal crisis reboots the DC Universe yet again, merging the universes. That said, sometimes the welding isn't permanent, as with the Red Circle characters, who eventually returned to Archie.
    • DC Rebirth saw the welding of Watchmen and the DC multiverse.
    • Interestingly, it's suggested that they are all interconnected through... X-Men. The final issue to the 1996 comic series X-Men Adventures, which is set in that animated universe, revealed that universe was the universe that gave way to the main Marvel Universe (thus making Galactus a Canon Immigrant retroactively). Even more, the Living Tribunal is shown watching the creation of this world, temporarily holding back the brothers who would cause the aforementioned DC vs. Marvel event and even mentions needing to talk to his his hooded spectorial counterpart.
  • Shazam! and Kid Eternity are a particularly interesting example. DC acquired the rights to both from separate comic companies. Eventually, they realized that Shazam's Freddy Freeman and the nameless Kid had remarkably similar back stories—both were raised by a grandfather who died in a boating accident caused by Nazis, which also resulted in the grandson getting superpowers activated by saying a magic phrase. As a result, Freddy and "Kit Freeman" were revealed to be brothers.
  • Jack Kirby's The Eternals clearly took place in a separate continuity at first, but later writers integrated the characters (most notably the Celestials) into the wider Marvel Universe.
  • Image Comics is an interesting case.
    • Originally, all of its titles took place in a shared universe. Over time, the original Image partners focused on their own corners of the Image Universe, causing the continuity to split into several distinct sub-continuities. The Shattered Image crossover made the split official. But Image partners still occasionally "borrowed" each others' characters, so the sub-universes still interacted. As new, non-partner creators become more prominent in Image Comics, they started building universes of their own, and they occasionally used the Image partners' characters. For example:
    • Characters from Jay Faerber's creator-owned series (Noble Causes, Venture, Firebirds, and Dynamo5) appear in each other's books all the time, creating a loose-knit "Faerberverse".
    • Robert Kirkman's characters occasionally cross over in a similar fashion (and sometimes become supporting cast - especially in Invincible). The Kirkmanverse and Faerberverse intersect at a number of points, especially The Pact mini-series. Other Image characters, such as Savage Dragon and Shadowhawk, often pop up. Spawn didn't make an appearance until Image United, which brought together characters of all of the current Image partners (Erik Larsen, Rob Liefeld, Todd McFarlane, Marc Silvestri, Robert Kirkman, and Jim Valentino), as well as Whilce Portacio and several other creators.
    • Angela from the Spawn universe jumped ship to the Marvel Universe at the close of Age of Ultron.
  • Eclipse Comics' four-part crossover mini-series Total Eclipse brought together virtually all company-owned and creator-owned characters that the company published.
  • 2000 AD:
    • The Harlem Heroes strip (about a basketball team with jetpacks in 2050) appeared to be totally unconnected to the 22nd centuy of the Judge Dredd universe until the son of one of the Heroes (John "Giant" Clay) joined the Judges (as Judge Giant).
    • The Judge Dredd story "Hammerstein" suggested ABC Warriors was also set in the past of the Dreddverse, but later ABC Warriors stories contradicted this.
    • Judge Dredd has also had crossovers with other 2000 AD strips whenever the writers felt like it, most notably Strontium Dog and the story Helter Skelter (where Garth Ennis basically crossed ALL his favourite strips over with Dredd).
    • Meanwhile, 2000 AD stalwart Pat Mills has crossed over everything he's ever written for 2000 AD with each other. Invasion!/Savage, Flesh, Ro-Busters, ABC Warriors, and Nemesis the Warlock all slot together.
    • Ian Edginton does the same thing with his 2000 AD strips: both Stickleback and The Red Seas share a secret organisation, little mentions and character cameos abound, and the same brand of monster appears in Stickleback, Ampney Crucis Investigates, and Detonator X.
    • Even more Edginton crossovers: Sir William Ashbless, immortal designer of the titular ship in Leviathan made a cameo appearance in Stickleback and his shipping company, White Hart Line, got name dropped in Ampney Crucis Investigates. Also a few locations have been repeated across the various strips at different periods in history.
    • John Smith did a similar thing from the start in order to make his stories stand out: all his initial Future Shocks linked in to an organisation called Indigo Prime, and a couple of Indigo Prime agents also appeared in Tyranny Rex. Indigo Prime then got its own series, and eventually crossed over with Smith's Vertigo Comics series, Scarab.
  • Alan Moore:
    • He, as time has gone on, has turned The League of Extraordinary Gentlemen into this, making vague references to the source material for Ozymandias and The Black Freighter. Oh, sure, it's only references to the inspirations for them, and Moore would probably rather have his skin boiled than actually go further than that, but this is Alan Moore. There are no coincidences. As an aside, Moore is a close friend to Moorcock, close enough that Moorcock has allowed Moore to put in some Moorcock characters into the League series free of charge.
    • Back in the day, Alan Moore sketched out a unified Warrior timeline, the most notable aspect of which was that, in an Alternate Universe where Micky Moran never regained his memories and powers, Emil Gargunza went on to build Fate, Norsefire's supercomputer. The timeline also established when all the "centuries in the future" strips happened in relation to each other, and introduced the Chronarchs, who Moore calls "Earth-2 Time Lords", and who seem to be based at least partly on his own version of Gallifrey in the Doctor Who Magazine comic strip. Then Moore quit Warrior and the book collapsed before any of this could actually appear.
    • Moore's Providence is an attempt to do this for all of H. P. Lovecraft's stories, or at least the different cycles. Much like League of Extraordinary Gentlemen, Moore is using Lovecraft's fiction to merge different stories and events into a single coherent verse. This includes "Cool Air", "The Horror at Red Hook", "The Shadow Over Innsmouth", "The Dunwich Horror", "The Colour Out of Space", "The Dreams in the Witch House", "The Thing on the Doorstep".
  • Frank Miller's Batman stories: Batman: The Dark Knight Returns, Batman: Year One, The Dark Knight Strikes Again, and All-Star Batman and Robin were originally supposed to be in separate universes, with only Batman: The Dark Knight Returns and The Dark Knight Strikes Again having any clear continuity with each other.
  • This article suggests that all of Mark Millar's later Marvel works (1985, Fantastic Four, Kick-Ass, and Old Man Logan) is all interconnected. (Three of those are automatically canonical to each other anyway, of course, but Kick-Ass is more of a surprise.) Even earlier Millar established connections between three comics published by different companies - Wanted, Chosen and The Unfunnies. The reason why at the end of Chosen the media doesn't report the Antichrist's miracles is that they're controlled by supervillains from Wanted. And Troy Hicks from Unfunnies helped Satan rape the Antichrist. Never published Run! was supposed to be set in that world too.
  • Grant Morrison's All-Star Superman and DC One Million seemed to be tied in the same continuity.
    • Of course, Grant Morrison is one of the architects of Hypertime (the other being Mark Waid) which posits that it is all true. Under this concept, the events of DC vs. Marvel exist somewhere in continuity.
    • Almost all of Morrison's DC works are tied to each other, as well to the real world, forming a big "Morrisonverse". Here's how it goes: In All-Star Superman Superman creates the infant universe Qwewq. In JLA we see the heroes discover (a version of) Qwewq. Both in ASS and in JLA: Confidential we see that Qwewq actually contains "our" Earth, i.e. a realistic Earth with no superheroes. The final Morrison-penned issues of Doom Patrol and Animal Man take place in a realistic world with no superheroes (and they both share the same colour scheme, meaning it's the same world in both), which is presumably Qwewq, i.e. "our" world. In Seven Soldiers we find out the ultimate fate of Qwewq (or at least one version of it). Final Crisis (which takes place in the same universe as JLA) refers to Bleed (the "sea" that separates different universes in the DC multiverse) as "ultramenstruum", and the same term is used is The Invisibles, implying that the Invisibles universe is a part of the larger DC multiverse. If we accept that Qwewq is "our" universe, this means our universe exists inside a larger universe populated by superheroes. Both Flex Mentallo and The Filth feature the "real" world to which superheroes from outside this world burst in; thus, the real world in both these comics could be (a version of) Qwewq. And then a huge chunk of the Damian Wayne stories written by Morrison that take place in the not too distant future were revealed to be set in the past of DC One Million and ends with Damian training Terry McGinnis from Batman Beyond to become his successor. Lastly it also seems that DC One Million takes place in the future of All Star Superman as Solaris and Kal Kent appear and happens to be the story of how Superman ended up having to fix the sun. To sum it up, almost all of Morrison's major works for DC are welded together, though admittedly some of the links between them are vague.
  • When Semic Comics, a French comic publisher, decided to revive the characters it inherited from defunct Editions Lug, editor Jean-Marc Lofficier set out to link over 2000 largely unrelated characters from just about every comic book genre into a single continuity. Some characters had to be revamped fairly drastically to fit in, and a few had to be revamped to avoid duplication.
  • In Non Sequitur, Wiley frequently used four separate sets of recurring, originally nameless, characters: a silent Everyman who'd observe some of the comics' less absurdist strips, a Leisure Suit Larry-ish barfly, a snarky Bratty Half-Pint girl and the Sunday-only diner owner "Offshore" Flo (and her tall-tale telling patron, Eddie). Gradually, the characters started interacting: the Everyman and the barfly were seen hanging out at the bar, the girl and Flo would occasionally be seen reacting to something from the Everyman's radio talk show. Eventually, Wiley brought all these elements together to form a central cor: Joe (the everyman) and Bob (the barfly) are brothers, Danae (the little girl) and her little sister are Joe's daughters and Flo is Joe and Bob's mother. Eddie remains "just" Eddie.
  • In one Super Special Sonic the Hedgehog (Archie Comics), Sonic finds himself universe hopping to the Sonic Underground universe. In the 25 Years Later storyline, he names his children after his counterpart's siblings.
  • The villain of Asterix and the Magic Carpet briefly refers to his cousin Iznogoud.
  • One issue of PS238 reveals that it and Nodwick are set in the same world, though taking place in different "Heroic Ages".
  • 2017's The Scream and Misty Special did this in a couple of strips. Maxine in The Return of Black Max passes by the Sentinels from The Return of the Sentinels, and the title character of Death-Man encounters aged versions of classic Fleetway characters Leopard from Lime Steet, Pete's Pocket Army, Deathwish, Steel Commando, Paddy McGinty's Goat, Doctor von Hoffman, the Iron Major, and The Dwarf, as well as the successors of Doctor Sin and Thunderbolt the Avenger.
  • This is the crux of the plot for RoboCop Versus The Terminator: the technology that turned Alex Murphy into RoboCop leads to Skynet gaining sentience and the creation of the Terminators.
  • Street Fighter vs. Darkstalkers establishes that the cast of both series shares the same continuity. For instance, Kolin is revealed to have gained her powers after slaying an ice werewolf.
  • Garth Ennis' characters seem to coexist in a single unified verse, with characters from Hitman (1993) being referenced in The Punisher MAX or Cassidy from Preacher showing up in The Boys.
    • His run on The Punisher can be divided into two 'verses: the Marvel Knights one set after the "Angel Punisher" Dork Age where superheroes exist and regularly get in Frank's way, and the MAX universe that's basically our world but crappier (superheroes don't seem to exist and Nick Fury is an operative who started in WW 2 with no explanation for why he never ages). However, villains from the first verse (the Russian and Elite's son) made cameo appearances in the MAX continuity.
  • IDW Publishing's GoBots miniseries ends with heavy implications that the GoBots are actually precursors to Transformers. In particular, Road Ranger talks of creating an heir who is an "optimized" version of himself and encourages Bug Bite to do the same, which implies that they are the creators of Optimus Prime and Bumblebee. The two also decide to recycle Leader-1 and Cy-Kill's remains to create a new GoBot, who is seen undergoing construction in the form of a jet plane similar to the alt mode of the Decepticon Starscream.

    Fan Works 
  • Haunted Mansion and the Hatbox Ghost: The fanverse includes several properties (fanmade and official alike) welded together into a single continuity, even when no continuity was intended from the authors.
  • "Of Powers and Pie" combines Pushing Daisies with Heroes by making Ned’s ability one of the many superpowers manifested in the show; later in the fic, Ned learns that he can use his ability to also heal the injured, healing Elle of serious injuries when she’s crushed by a collapsed ceiling and mending Mohinder’s broken leg. As well as Ned, Olive realises that she can create force-fields when she is attacked by Sylar before Peter Petrelli saves her.
  • The Slayer Prophecy has a few of these, mostly explaining how the Buffy cast can be part of the wider DC Universe and still have spent so long acting alone;
    • It is explicitly stated that the Hellmouth deflects external interest, which is why none of the major superheroes of the DC Universe have visited the city before.
    • Rack apparently fought Doctor Fate in the past before Rack and Fate disappeared from the public view.
    • Spike observes that Dala and the Monk were members of the Order of Aurelius, with the Monk just a little bit younger than the Master was at the time of his death.
  • In Harry Potter and the Mystic Force, it is established that Harry Potter and Power Rangers exist in the same universe (and in a reality where the Rangers battled Ivan Ooze as well as apparently all other televised continuity still being valid); no reference is made to other Hogwarts students being aware of past Rangers, but this can be attributed to the wizarding world’s stereotypical ignorance of muggle activities.
  • In Tara Sheppard, after Tara McClay meets her half-brother John Sheppard and learns about his work with the SGC, after analysis of Tara's DNA provides the means for the Asgard to cure their genetic degradation, Thor provides a full history of how demons fit into what the SGC know of Earth’s history.
  • Finmonster's The Marvelous World Of DC and its sequel, Harry Potter and the Guardian's Light has an abundance of this;
    • Krypton is destroyed by Galactus, and Kal-El's landing is investigated by the Men In Black (to the point that Agents D and K are regarded by Clark as uncles, though moreso D than K).
    • Thor is sent to Earth to be raised in an amnesic state on Themyscira, which hides his true heritage until the time is right, to the extent that he considers Diana his sister as a child. That said, it is implied that Diana think of him as more than that.
    • Hellboy comes to Earth on the same night that Captain America 'dies', and it is later established that his father is Trigon the Terrible (with Raven, his half-sister, being raised as his daughter when she is born a few decades later).
    • 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 Frankenstein's Monster(the DC version from Seven Soldiers Of Victory) and Jack Russell, the Werewolf by Night.
    • The Nova Corps are basically a 'spin-off' of the Green Lantern Corps (Sinestro compared them to second-stringers, but considering his nature anything he says must be taken with a grain of salt).
    • The Ghost Rider is now an agent of the Spectre (who went mad at some point prior to the series, and started persecuting magic-users, which is why the Statute of Secrecy was put in place).
    • The Sentinels of Magic include Albus Dumbledore, Doctor Fate, Doctor Strange, Madame Xanadu, the Enchantress, Shazam, and Agatha Harkness.
    • Peter Parker, Jimmy Olsen, Garfield Logan, Virgil Hawkins, Johnny Storm and Victor Stone were all at high school together before most of them received their powers (or had to get their 'powers' in Vic's case) in the same accident (caused by Jack Napier , Eel O'Brian, and Flint Marko under the orders of Lex Luthor and The Kingpin, while the Fantastic Four, the Hulk, Doctor Doom, Captain Atom and Firestorm were created in another event orchestrated by Rasputin the Mad Monk.
    • Raven and Wanda Maximoff attend Hogwarts with Harry (and Constantine and Zatanna are also Hogwarts alumni).
  • Infinity Crisis does this a lot.
  • It happens often in Maribat AU fics, considering the nature of the stories:
    • Some stories take advantage of the fact that one of the previous holders of the Ladybug Miraculous was Hippolyta in order to introduce Wonder Woman into the story.
    • Alfred is often made a former Peacock Miraculous holder before it was mysteriously lost, a distant relative/family friend of the Dupain-Chengs, or both.
    • There are a few fics where Marinette and Jason Todd met before Jason becomes Red Hood and Marinette becomes Ladybug which is used as another way to establish their sibling bond.
  • Child of the Storm is a Mega Crossover, and the author created a completely different canon by combining all the source material canons together.
    • The Marvel Cinematic Universe is followed up to The Avengers (not including movies prequels), but the events of Captain America: The First Avenger are combined with his comic book adventures and his brief cameo in X-Men: Evolution, on top with a period spent in Hogwarts mid-war when dealing with an alliance between HYDRA and Grindelwald. So in the end there's no way of telling the exact details of his life before he became "capsicle".
    • Characters from several different canons end up being related to each other (something engineered by Doctor Strange as part of The Plan to defeat Thanos), which got so complex it led to this fic being the only work of any kind to have its own page for Tangled Family Tree. Highlights include Harry Potter being Thor's son via an early attempt at the whole humility thing (the basis of this fic) and Clint Barton being related to Superman (by adoption) and Minerva McGonagall and Bucky Barnes (biologically). In Harry's case, at least, it gets lampshaded in chapter 52 of the sequel, by Carol Danvers: "I swear, your fucking family..."
    • Jor-El arranged his son to end up with the Kents via his connections to S.H.I.E.L.D., and at one point he fought against the Red Room.
    • Several intra-franchise conflicts occurred in the past, such as Alan Scott against Magneto, or Doctor Strange eliminating some god-like enhancements Grindelwald had acquired from a Deal with the Devil (several even) from the likes of Mephisto and Dormammu, before leaving him to Dumbledore.
    • The existence of the Spider Totems is known to the magical community and even gets mentioned in Harry's DADA class.
    • The vampires follow The Dresden Files system, replacing the Harry Potter ones.
    • The story of the X-Men seems to be a mix of X-Men: First Class and X-Men: Evolution, with several Noodle Incidents happening in the meantime.
    • John Constantine was a Hogwarts student (Slytherin, naturally) and fought against the Death Eaters.
    • Some characters are blended together into one, such as Peter Wisdom being Regulus Black and Dudley Dursley becoming the Blob.
    • The Phoenix Force is now also Destruction from The Sandman and the source of Harry's protection via a deal with Lily Potter.
  • The Friends and the High Council WMG is an attempt to do this with every Disney-owned property.
  • Of Gemstones and Watches welds the Prime Ben 10 universe and the 2016 Reboot together- multiple concepts from the 2016 show have popped up in universe, such as the original aliens, certain plot points and villains.
  • Jaune Arc, Lord of Hunger establishes that the Brother Gods in RWBY are actually Celestials and Remnant is located within the Unknown Regions of the Star Wars galaxy. Additionally, both Aura and the magic on Remnant are revealed to be extensions of the Force.

    Films — Live-Action 


    Live-Action TV 

By Creator:

By Network:

By Series:

  • Arrowverse:
  • Russell T Davies has suggested that Adam Mitchell's mum in Doctor Who, played by Judy Holt, may be the same person as Sister Mitchell in Childrens Ward, also played by Judy Holt, which would bring RTD's earlier programme into the Whoniverse. He was probably joking. He also slipped a reference to "the Vivaldi inheritance in 2004" into Torchwood: Miracle Day, referring to his ITV series Mine All Mine ... which included Gareth David-Lloyd as a character called Yanto Jones, only one letter off from his Ianto Jones in prior series of Torchwood.
  • Thanks to its importation of the Homicide: Life on the Street character John Munch and its numerous other crossovers (some involving him, others not), the Law & Order franchise managed to bring in NCIS, NCIS: Los Angeles, JAG, First Monday, In Plain Sight, The Beat, Hawaii Five-0, The Wire, Arrested Development, The X-Files, The Lone Gunmen, and Millennium all into a single universe. Also, Sesame Street, if you count Muppet versions of the character. All this also fits into the Westphall Hypothesis above.
    • The scariest part of that link? The X-Files crossed over with COPS, a reality show, meaning that all those shows take place in our universe... Which is, of course, the imagination of an autistic boy with a snow globe.
    • NBC has also announced a crossover between Chicago P.D. and Law & Order: SVU, this means that Chicago P.D. and Chicago Fire are also part of this verse.
  • Later Kamen Rider shows have taken steps to establish that the various characters created by Shotaro Ishinomori (or at least Alternate Universe versions of them) exist in the same universe. For example, characters from Space Ironmen Kyodain appeared as the antagonists of one of the Kamen Rider Fourze movies, while Inazuman appeared in the crossover movie between Fourze and Kamen Rider Wizard. Kamen Rider Gaim also had a crossover with Kikaider designed to promote the latter's new movie.
  • Lisa Kudrow, who played a quirky waitress on Mad About You, played Phoebe on Friends. It was later revealed they were twin sisters and Ursula (the waitress) became a recurring character. It was also revealed that Paul once lived in the apartment now occupied by Kramer on Seinfeld.
    • In the second season of Friends, there was a brief crossover with Caroline in the City. Matthew Perry had a brief appearance on the Caroline episode as Chandler while Lea Thompson had an appearance Caroline in the Friends episode. Expanding beyond those two, earlier that same season Niles Crane and Daphne Moon appeared in one Caroline episode, and Frasier himself showed up in an episode of Wings. Based on this logic, potentially every NBC sitcom that ran during the 90's takes place in the same world (and also proceeds to directly tie into the Westphall example below).
  • There was a crossover between Murder, She Wrote and Magnum, P.I., and one between Magnum, P.I. and Simon & Simon. Accordingly, all three are in the same universe.
  • Marcia Wallace appears in what at first appears to be a Casting Gag as one of Murphy Brown's many, many secretaries. Then, at the end of the episode, Bob and Jerry show up, begging her to come back to Chicago. Ergo, Murphy Brown takes place in the Bob Newhart 'verse. What effect the series finale of that show has on Murphy & Co. is a Riddle for the Ages.
  • Although the Showtime revival The Outer Limits (1995) was an anthology show, it usually ended its seasons with money-saving clip shows tying multiple prior episodes together into a single continuity.
  • Power Rangers has gone through this a few times. While the first six seasons were all one storyline and the seventh (Power Rangers Lost Galaxy) was a direct sequel, each one past that has been self-contained; though many would make small references to prior seasons or at least eventually team up with the prior season's cast. Only two seasons (Power Rangers Ninja Storm and Power Rangers RPM) have been welded in after the fact, having nothing in themselves to connect to the rest of the franchise; and the third unconnected season (Power Rangers Jungle Fury) has been welded into Power Rangers Megaforce's Crisis Crossover. Also notable was that Power Rangers Lightspeed Rescue welding itself to Lost Galaxy retconned the latter from 20 Minutes into the Future to the present day. (Lost Galaxy also once referenced the universal coordinates of the Doctor's homeworld Gallifrey.)
  • Rumors abound to this day that Patrick McGoohan's Number 6 from The Prisoner (1967) is the same character as John Drake, his role in the earlier series Danger Man. McGoohan always denied it while other people involved in the show supported it, in what was probably a deliberate attempt to screw with the fans some more.
    • It's been suggested that McGoohan tended to deny it solely because he didn't hold the rights to his previous role, and thus, establishing a direct connection could be considered copyright infringement and therefore actionable. His co-writer on the series has always claimed that it was definitely Drake.
  • The 1970s ITV relaunch of The BBC sitcom The Rag Trade had Peter Jones and Mirian Karlin reprising their roles from the sixties series, confirming they were in the same continuity ... and also added Olive from the same creators' On the Buses. (The character of Reg Turner played by Reg Varney wasn't in the relaunch, so Olive didn't wonder why he looked like her brother Stan.)
  • In the last episode of Spin City where Michael J. Fox appears as a regular, it is suggested that the series takes place in the same universe as Family Ties.
  • Taking this to the extreme, due to various character cameos and crossovers, much of television history may take place in the mind of St. Elsewhere's Tommy Westphall.
  • The Ultra Series: Originally, the first three shows had minimal connections aside a few minor nods here and there. However, with Return of Ultraman, they were united into a singular continuity that followed for the rest of the Showa era, as well as with the Heisei series Ultraman Mebius and Ultra Galaxy Mega Monster Battle (which ends up creating a lot of contradictions as a result). Then, with the Ultraman Zero movies, the remainder of the franchise was linked up with the Showa universe to create a massive multiverse, and then afterwards it gets super-confusing from there.
  • In Gran Hotel, Detective Ayala, played by Pep Antón Muñoz, investigates crime around a big fancy hotel during the first decade of the twentieth century. In Alta Mar (set in the 1940s), Doctor Ayala, also played by Muñoz, boards the Barbara de Braganza and tells the head of ship's security that his father was a criminal investigator. Confirmed by Word of God that the characters are meant to be father and son.

    Myths & Religion 
  • Robin Hood went through several rounds of this, along with Adaptation Displacement. Maid Marion (or "Marian"), Friar Tuck, and Alan-a-Dale were all characters from separate folk tales, and it was only later that Robin Hood stories had anything to do with Richard the Lionheart or Prince John.
  • The Equivicatio Romana by which each of the gods and goddesses of the other pantheons the Romans encountered was said to be another name for the nearest equivalent in their pantheon—sometimes by a great deal of squinting.
  • Euhemerism which postulates that the pagan gods and goddesses were actually great heroes and heroines who lived long ago and whose reputations snowballed until they became gods.
    • Herodotus one-ups Euhemeris by trying to equate Egyptian mythology and Greek mythology.
  • The two Classical Mythology stories that bring together large numbers of Greek heroes likely have their origins in Canon Welding: the Voyage of the Argo and the Calydonian Boar Hunt both feature characters like Herakles, Theseus, Bellerophon and so on.
  • Historia Regum Britanniae weaves The Aeneid, The Iliad and The Odyssey into the Arthurian mythos by having Brutus of Troy sail to pre-Roman Britain and found a new empire with New Troy (aka London) as the capital which sets the stage for Arthur and the Knights of the Round Table.
  • A lot of theological ink has been spilt over two millenia in attempting to draw out a coherent welding of the often contradictory themes of the Old and New Testaments of The Bible, with insertions and foreshadowing of the mission of Jesus Christ drawn (often very tenuously) from the older religious texts. The Old Testament is effectively being retconned to include Jesus and to give the whole a greater coherence. All this began with the earliest Christian writers like Paul of Tarsus, who asserted Jesus had been predicted by Old Testament prophecies, in interpretations the Jews rejected.


  • Pokémon World Tour: United establishes in its first episode that the series takes place twenty years after the events of the Pokémon Red and Blue video games, with Red being a Pallet Town hero and Blue being the first Gym Leader Rose and Cobalt face. However, the end of act one reveals that the new regime of Team Rocket is led by characters from the Pokémon anime, specifically Jesse and James. Further, other characters from the anime, Butch and Cassidy, are aligned with a separate faction of Team Rocket that's A Lighter Shade of Black. Later, when exploring the old Rocket hideout in the Celadon City Game Center, Cobalt uncovers a document describing the new regime's rise in power, which includes mentions of Ash and his frequent battles with grunts Jesse and James and their talking Meowth. This all amounts to show that, in this version of the Pokémon universe, the events of the game and the events of the anime both occurred.

  • The Green Hornet was the son of The Lone Ranger's nephew back when the two were on the radio. However due to legal issues between those who currently own the two franchises, the connection isn't used at all anymore.
  • When The Last Chance Detectives were adapted to radio, their premiere episode included an appearance by Jason Whittaker of Adventures in Odyssey, welding the two previously unrelated Focus on the Family franchises.


    Tabletop Games 
  • An odd version of this exists in Dungeons & Dragons. Gods cross over from one campaign setting to another, spells exist under different names, and so on. Initially the settings were welded only by implication, mostly mythological crossovers (shared gods) and in the names of spells (Bigby's grasping hand, Mordenkainen's hound) indicating that divine beings and powerful wizards COULD travel between them, but providing no actual explanation. Later, the Planescape and Spelljammer meta-settings provided two (amusingly contradictory) explanations: in Planescape a stock-fantasy multiverse exists, with the added benefit of explaining where all the more biologically impossible elemental and evolutionarily improbable critters come from. Spelljammer is based on medieval cosmology, and adventurers can sail between the various crystal spheres in mighty magical craft riding currents in the luminiferous aether.
    • There was also the World Serpent Inn, which even links campaign settings which are explicitly not part of the Planescape/Spelljammer cosmology, such as Eberron.
    • Ravenloft is, itself, a product of Canon Welding, as its Patchwork Map incorporates several domains that were inspired, copied, and/or outright stolen from other AD&D campaign worlds. Literally stolen, in some cases.
    • The "legendary" settings of the various AD&D Historical Reference books were eventually revealed in the Chronomancer appendix to be the past of Gothic Earth from Ravenloft's Masque of the Red Death ...which in turn may be the past of one of the magical d20 Modern settings — probably Shadow Chasers (the Red Death gets mentioned in the Menace Manual).
    • In D&D 4th Edition, there was a policy to enforce uniformity across the gameline by inserting setting elements from the core material into all official D&D settings, and retcons and setting-shaping disasters were applied wherever necessary to make it so. For example, the cosmology of the Forgotten Realms had to allow for such things as the Primordials and the Feywild because those were part of the Nentir Vale cosmology. However Dark Sun in 4e was largely able to maintain its independence from such core elements, either by slapping new names on old Athasian material (and often ignoring them afterwards) or by rejecting them entirely if they couldn't. (This is in part helped by Dark Sun's traditional independence from the rest of the D&D line; crossovers were firmly discouraged even at the height of the TSR and Planescape days.)
    • The D&D 5th edition supplements Plane Shift: Innistrad and Plane Shift: Zendikar enable campaigns to be set in the Magic: The Gathering multiverse.
  • The Old World of Darkness started off as a set of tabletop RPGs each designed as a stand-alone, but since they shared the same basic gameplay and theme, crossovers were an obvious possibility. White Wolf acknowledged this by grouping them together, but they don't all fit that well. Vampire: The Masquerade has a Biblical origin story, while Werewolf: The Apocalypse has a pagan backstory. Vampires and mages are both supposed to have secret societies manipulating human history for centuries at least, with directly conflicting goals, yet there's only one case in canon of them fighting each other. And several games have a metaplot pointing to the forthcoming end of the world, but all have a different scenario for it. When it came to mechanics, mages can curbstomp any of the other supernatural beings unless caught unaware (especially vampires, since the best way to counter mages' magic is to be alive).
    • The New World of Darkness is made with the possibility of such crossovers explicitly in mind, at the same time keeping each group generally out of each others' way. For example, the Supernal Realms of Mage: The Awakening and the Shadow World of Werewolf: The Forsaken have little to do with each other, but equally don't step on each other's cosmological toes.
    • Exalted was an inversion. The original concept for the game was for it to be set in the forgotten, mythical prehistory of the Old World of Darkness... but it was ultimately decided not to make this an absolute of the setting, and reduce the connections to common setting elements and parallels that hint at the possibility. The tagline "Before there was a world of darkness..." is The Artifact of the original concept.
  • Rifts:
    • Want Robotech mecha to fight the Teenage Mutant Ninja Turtles alongside unicorn-riding cyborgs, only to have them all ambushed by eldritch abominations? Have at it! Palladium Books specifically published conversion books for incorporating their other franchises into Rifts rules.
    • The Rifts Chaos Earth RPG (which takes place during The Great Cataclysm) explicitly state that Rifts is the future of the Beyond the Supernatural setting. This had previously been Kevin Siembieda's headcanon, but he hadn't wanted to firmly state it because Rifts was also supposed to be our Earth's future.
  • The Warhammer and Warhammer 40,000 universes used to be linked, although the linking statements were made by mad characters. The whole saga/background is told through an Unreliable Narrator anyway. Games Workshop has stated that the link is now done away with, since it was mostly silly anyway. Warhammer world used to be a planet in the 40k universe, surrounded by warp storms that made it inaccessible for the rest of the galaxy. Nowdays they exist in separate universes, but there appears to be a small link between them in the form of the Warp (the Chaos Gods are the same in each universe, and some people in Warhammer world have gotten visions of Chaos in 40 universe. For example, in Liber Chaotica: Book of Khorne, it's all but outright stated the author is having visions of Abaddon's 13th Black Crusade. Also the Old Ones in Warhammer appear to be the same as the ones in 40k, and a fan theory suggests they escaped from 40k universe to Warhammer one after the War in Heaven). There is no real interaction between the two universes, however, unless you count some daemon characters popping up in both universes and a few magic items that have a suspicious resemblance to 40k technology. It also used to be fairly heavily implied that Sigmar (the fantasy Empire's messiah figure and founder) was one of the missing Primarchs (genetically enhanced superhuman offspring of 40k's Emperor). Warhammer 40,000 was later considered to be simply the Spiritual Successor where everything is an expy of the original Warhammer Fantasy.
  • The GURPS Infinite Worlds setting ties together every alternate universe they ever came up with and every licensed work ever adapted to GURPS from Uplift to Discworld to Hellboy.
  • Earthdawn is canonically set in the distant past of the Shadowrun setting.

    Theme Parks 
  • In Jimmy Neutron's Nicktoon Blast at Universal Studios, all of the Nicktoons are shown as existing together in a large multiverse, with the soundstages acting as portals between their worlds.
  • In Disneyland Paris, the story of the town of Thunder Mesa (the park's version of Frontierland) ties together Big Thunder Mountain and Phantom Manor in a tragic tale of a haunted bride
  • The Society of Explorers and Adventurers storyline at the Disney Parks grew from a backstory for Tokyo Disney Sea's Fortress Explorations into a shared universe incorporating that same park's Tower of Terror, Hong Kong Disneyland's Mystic Manor, the extinct Pleasure Island and its Adventurers Club, the unbuilt Discovery Bay and its affiliated films, the Jungle Cruise and the Indiana Jones films (which themselves were previously connected to the Jungle Cruise by backstory for the Indiana Jones Adventure).

  • Transformers:
    • Pepsi Convoy is made of sentient metal, the substance that makes up Pepsiman.
    • The "Alternity" toy line links the alternate universes of Binaltech, Binaltech Asterisk, and the Kiss Players radio drama, based on the Japanese Transformers: Generation 1, and Micron Densetsu, the Japanese version of Transformers Armada, and the Action Figure File Cards of the Transformers live-action film toy line, and the game Transformers: Convoy no Nazo.
    • G.I. Joe is referenced with the Transformers: Energon Snow Cat (Cyclonus) transforming into a Snow Cat vehicle, the Transformers Timelines subscription exclusive "Serpent O.R." referencing Serpentor, and the Transformers: Generations Combiner Wars Viper turning into a Cobra Rattler plane with a combined Cobra/Decepticon insignia. Exclusive sets from San Diego Comic-Con and the Transformers Collectors' Club combine both series.
  • Through commercials, The Trash Pack, Shopkins, and The Grossery Gang, all blind-bagged rubber figurines by Moose Toys, share a world.

  • The MS Paint Adventures series Problem Sleuth ties into the two comics that predate it:
    • Jailbreak ties into it when Zombie Ace Dick and his whale crashed into the jail where Jailbreak was set. Indeed, a dead whale was part of an early Jailbreak puzzle, and ZAD and the Completely Sane Man were revealed to be the skeletons in one of the cells. Another Ace Dick comes across the forest where two of the jail's prisoners escaped to, as well as the tree stump where they died.
    • The events of Bard Quest appear to end at around the same time Ace Dick plays his Game of Life session, as the swamp he trudges through during the Oregon Trail segment is shown to be Bard Quest's Swamp of Mystery. The Bard's party is stuck in the same poses as one of its last panels.
  • Homestuck's Comic Within A Comic Sweet Bro and Hella Jeff predates Homestuck. It was originally written as a parody of another Webcomic called Higher Technology, and was written into Homestuck as a Webcomic run by Dave Strider.
    • In a semi-canonical donation extra the Problem Sleuth characters did battle with the Midnight Crew. That gang would later become extremely plot important in Homestuck. Even though both Problem Sleuth and the Midnight Crew exist as fictional works in the Homestuck universe — in fact, instead of Homestuck, in-universe the adventure following Problem Sleuth was based on The Midnight Crew. To confuse the issue further, an Easter Egg in Homestuck implies that Problem Sleuth starred a group of the natives of Prospit, making Problem Sleuth (and technically the rest of MS Paint Adventures, as seen in its own section) canonical to the Homestuck multiverse, though where it fits was never hinted at.
  • In Starslip Crisis, the character of Vore is all but explicitly stated to be in fact Vaporware from the author's previous comic, Checkerboard Nightmare. However, this can be considered only to be a partial example, since said strip's events are never mentioned in Starslip and Vore himself seems to have lost his memory up to that point, causing a bit of a personality change (yes, Vaporware also expressed desires to exterminate mankind, but Vore's a lot more proactive about it), so for all intents and purposes Vore can be considered a separate character. Eventually he did regain his old memories and personality, and started calling himself Vaporware again...right before he was killed off for real. But records of the past (or Real Life, 21st Century Earth) seem to be extremely sketchy, as evidenced by the Show Within a Show "Concrete Universe," where covered wagons exist at the same time as cloning.
  • Crossover Wars and The Crossoverlord established many webcomics as part of the same multiverse with rules more akin to Westphall's mind. The Realitease page done by Crossoverlord creators contains interesting informations about which webcomics happens in the same universe with lists of proofs and explanations:
  • Heroes Unite did it with a horrifying amount of Super Hero webcomics, hosted on Drunk Duck. First it established that Energize, Bombshell, and an alternate counterpart of 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 Energize and Dasien did a short (currently on hiatus) crossover between their characters, while the former used a new Shared Universe to bring back his other webcomics - Fearless, SHELL teamed up with The Blonde Marvel and Bombshell and gets his ass kicked by one of Hero Force 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 the webcomics multiverse. Having kickstarted the whole superhero crossover thing on Drunk Duck, Heroes Unite is now set in its own self-contained universe, but the crossover goodness continues in the spinoff Heroes Alliance with the characters from Karabear Comics Unlimited and even involved Jenny Everywhere and golden age characters like Madame Fatal.
  • T Campbell has done this with various webcomics he's written or co-authored, both played straight and using alternate versions of characters.
    • Penny and Aggie, Cool Cat Studio and Sketchies are set in the same universe. However, the SF and supernatural elements in Cool Cat Studio are absent from the other two comics. Campbell once explained this on the P&A forum by stating that such elements exist on the periphery of the comics' shared universe, so not all its inhabitants experience, nor are even aware of, such things.
    • This is in contrast to the Fans! universe (and its alternate versions of P&A's characters), where, particularly after the Revival, paranormal occurrences are so frequent and prominent that the entire world is aware of them. Also, alternate versions of characters from Penny and Aggie and Fans! appear in each other's universes every so often.
  • Barry T. Smith's Ink Tank appeared to be in an entirely new universe from the previous strips...until a story arc which ended with the Author Avatar having a nervous breakdown was resolved by Dante from Angst Technology turning up and treating him to a coffee.
  • Artist Ursula Vernon's Digger, an anthro adventure about a mildly cynical wombat and a statue of the god Ganesh, has this if you start reading her other work. An awful lot of everything she's done seems to have characters in common with the Gearworld, her vaguely-steampunk clockwork-labyrinth art-and-fiction setting. It's only vaguely hinted at in Digger itself.
  • Sugar Bits might have done it when one of the villains summoned Red and The Big Bad Wolf from Ever After to fight protagonists. However, given the nature of the Sugar Bits world and Bleedman's own words, those two comics may or may not share an universe and this will remain unresolved until Endling, creator of Ever After, will confirm it.
  • Shaenon Garrity's Narbonic and Skin Horse were officially confirmed to take place in the same continuity with the introduction of Artie Narbon to Tip Wilkin. Garrity had previously revealed in Narbonic Director's Cut that the main Narbonic characters, Dave, Helen, and Mell, came from three different comics she had drawn in high school and college. Mell also gets her own Spinoff Babies comic, Li'l Mell, and a character introduced in that comic has now shown up in Skin Horse. Garrity's lesser-known Smithson may fit into the same continuity as well; minor character Queensbury Joe appears to be the older version of Homeschool Joe from Li'l Mell.
    • Mel has also appeared twice in Everyday Heroes - once in a brief flashback where Mr. Mighty thwarts one of Helen's capers and again where she appears as Dr. Unpleasant's lawyer.
  • Eli Parker created several different web projects, including Too Far (a comedy space opera webcomic), Powerup Comics (a Stealth Parody of Two Gamers on a Couch webcomics), and These Web Comics Are So Bad (another Stealth Parody, this time of webcomic review blogs). Then Parker created Unwinder's Tall Comics, which included cameos from all of the above, establishing that they (or at least their fictitious authors) all exist in some sort of continuity.
  • There was earlier hints about Bob and George and its fancomics/subcomics taking place in the same multiverse. Ridiculous amount of cameos got finally an explanation, when Rick O'Shay and Chick-Bot appeared in the main comic to tell the true nature of White Space. It was a demi-plane that connected all the universes together. It was later abused by sending all the Mega Mans and other characters into one universe, to fight Bob.
  • Glorianna and Sparky of Lady Spectra & Sparky shared an adventure when Glorianna was briefly transported to the 21st century (while Lady Spectra ended up in Glorianna's era).
  • Anna/Susan from Sire showed up in Evil Plan, where it was revealed that they are the cousin of Hero Antagonist Kevin Kolton. Characters from Evil Plan and Mortifer have shown up in each others' works, and Agent/Andrew Cross shows up in both Evil Plan and morphE.
  • In Spinnerette there are a few arcs centered around Hell and its inhabitants, where we meet Minerva's friends Tom, Kia, Lucretia, and Guinness, all hailing from Krakow. Whether the Marilith duology and Charliehorse are also part of The 'Verse is unknown.
  • Played with in the various Alternate Universe comics for Darths & Droids, where sources that aren't extensive franchises are sometimes "planned" to be continued with other works (either thematic or from the same creator) according to their FAQs. Of course, all of these comics are one-shots, and how these instances of canon welding could actually play out is left to the readers' imaginations. Now for the complete list of proposed merged canons...

    Web Original 
  • The (In)Famous David Gonterman, Ed Wood of the World Wide Web and the Internet's Most Dangerous Cartoonist; reuses characters, concepts and names so often that it more or less seems that every single thing he's ever written or drawn are all set in the same vague universe/multiverse. This may be partially intentional, but, well...
  • The Fear Mythos incorporates The Slender Man Mythos into their canon, as well as the Black Dog from folklores of the British Isles, and later incorporated the Smiling Man from The Jeanette Experience as a Canon Immigrant. The Cthulhu Mythos is a part of it too, with the blog Mephi, having many of Lovecraft's creatures being a major part of the story. The Fear Mythos and Sleeper Mythos are also an example of this, while the Fear Mythos and The Arkn Mythos are an inversion (depending on who you ask, as the exact history of the latter is disputed and unclear). The Fear Mythos as a whole was created from several separate Slender Man Mythos spinoffs, then separated into countless canons as the authors of each story see fit.

    Web Videos 
  • That Guy with the Glasses likes this trope, finally creating an official merging of every TGWTG-involved character during the huge anniversary brawl, and again during Kickassia, Suburban Knights and To Boldly Flee, plus the millions of crossovers between producers. The Nostalgia Critic took this a step further and incorporated Doug himself into the mix, crossing over with his vlogs.
  • A Youtuber named PopularMMOs has a series called The Crafting Dead. In the third season, he puts Dr. Trayaurus, of TheDiamondMinecart fame into the series. Before him, he puts Captain Cookie, from Epic Proportions, another series by the youtuber, became part of the story.

    Western Animation 

Alternative Title(s): Inevitable Crossover, The Moorcock Effect


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