View source for Shared Universe

{{trope}}
{{cleanup|This trope is not "Works share the same 'verse." This trope is "Works ''by multiple writers'' share the same 'verse." If only one or two writers wrote the stories listed in an example here, then that example doesn't belong here.}}

When [[The Verse]] is shaped by multiple creators, writing independently. Many different comic book titles are set in a collective continuity, making it easy to have a [[Crossover]]. In contrast, a single TV series with multiple writers is just the Verse with subcontractors. Likewise, when different continuities by the same author are tied together later by an [[Intercontinuity Crossover]], that's [[Canon Welding]].

The nature of the [[Shared Universe]] — multiple independent creators creating one continuity — can easily lead to a [[Continuity Snarl]] if it lasts a long time and the different creators don't take care to keep things straight. If a Shared Universe starts relying too heavily on continuity, especially if it's obscure or too reliant on each work in the Verse, a [[Continuity Lock Out]] may occur. When creators disagree on the direction the Verse should take, they may fight [[Armed with Canon]]. If some corners of the continuity are "off limits" to some characters to avoid theme-drift or plot derailing, then [[Superman Stays Out of Gotham]].

When they [[Older Than Steam|go back centuries]], [[Older Than Feudalism|and even further]] and [[Older Than Dirt|further]], long before copyrights and trademarks, the Shared Universe turns into one or more actual mythologies. Compare with [[The Verse]], [[Expanded Universe]] and [[Canon]]. Contrast with [[Shout-Out]].

Compare with [[The Cameo]], where a character makes a "guest appearance" in another work; [[Crossover]], where an entire work's cast of characters makes a "guest appearance" in another work; [[Fusion Fic]], where an entire work's cast of characters ''replace'' the characters in another work; and [[The Verse]], where one writer sets multiple works in the same reality. '''Note: just because two or more works have had a [[Crossover]] does not mean that they share a universe.'''

{{examples|suf=s}}
== Actual Examples ==
===  Comic Books  ===
* Various universes of [[Marvel Comics]].
** The [[Marvel Universe]] of Earth-616.
** The [[Ultimate Marvel]] universe.
* Similar to Marvel, [[The DCU]] is an examples of this, with multiple monthly titles who might not even have the same creative team month to month.
** And those two are connected by the Amalgam universe, several canonical crossovers and a few characters who break the fourth wall.
* ''[[Ninja High School]]'' and ''[[Gold Digger (Comic Book)|Gold Digger]]'' loosely share a universe and occasionally engage in crossovers or use each other's villains.
* In the ''[[Savage Dragon]]'', there is a shared universe that not only consists of the rest of the Image Universe but also creator-owned properties such as ''[[Hellboy]], [[Madman (Comic Book)|Madman]]'', and ''[[Bone]]'' have made appearances. Aside from that, Erik Larsen likes to [[Lawyer-Friendly Cameo|slip in characters from the Marvel Universe and DC Universe]]. Often, this consists of characters showing up far in the background, being mention in passing but not shown, or having a single boot or glove visible that indicates that those characters are there but enough is concealed to avoid copyright issues.
** Virtually all of the early [[Image Comics]] titles were set in the same universe, with the stars of any given book often making guest appearances in another. However, one of the core ideas of the company was and always has been creator ownership. This caused a [[Continuity Snarl]] no less than ''twice''; Once, when [[Rob Liefeld]] picked up his characters and left to create Awesome Comics (though he returned after Awesome folded), and again when Jim Lee took ''his'' properties, which encompassed about half a dozen titles, and made his Wildstorm Studios into a DC imprint.
** Currently, ''[[Invincible]]'' shoulders a lot of weight when it comes to establishing a larger Image universe. Characters from Kirkman's other books popping up frequently, and big events (like the funeral of the Guardians of the Globe or the Invincible War) feature just about anyone who's anyone in the company at the time. At one point Mark was even a member of the Pact, a team consisting of him, [[Noble Causes|Zephyr Noble]], [[Fire Breather]], and Shadowhawk.

===  Fan Works ===
* ''[[Dangerverse]]'' fans have written numerous fics of their own set in the same universe, many of which have been integrated into the canon, as well as [[Alternate Universe Fic]] aplenty. The author has no qualms about working in ideas from her friends and fans.
* The AU ''Shadowverse'' stories about ''[[Magical Girl Lyrical Nanoha]]'' characters Lutecia and Vivio, created by [[Radiant Beam]], also involve many other writers who write about secondary characters in that universe. Each of the various authors tend to write around different themes (spy-thriller, emotional drama, political-thriller, etc) despite writing in the same AU.
* More than a decade after the release of ''Under The Bridge'', ''[[Chip 'n Dale Rescue Rangers (animation)|Chip 'n Dale Rescue Rangers]]'' fan fiction writers love to include enough elements from ''[[The Nowakverse]]'' into stories of their own, especially the main original characters.
* ''[[The Secret Return of Alex Mack]]'' has spawned a shared universe called ''[[The Teraverse]]'' (also known as the "Alexverse", for the main character of the original story).  This turns out to be part of a larger 'verse spanning multiple universes, called ''[[A Brane of Extraordinary Women]]'', whose contributors mostly overlap with the ''Teraverse'' writers.
* The ''[[Sailor Moon Expanded]]'' project was intended as a shared fanverse from the very start.
* ''[[My Apartment Manager is not an Isekai Character]]'' has had anywhere from two to six writers active at any given time, although by the end of 2022 that number had stabilized near the high end of that range.

===  Film  ===
* The [[Marvel Cinematic Universe]] -- a single coherent world which officially began with ''[[Iron Man (film)|Iron Man]]'' in 2008 (and retroactively included two previous ''Incredible Hulk'' movies).  As of early 2021 the MCU is composed of twenty-three films with fourteen more in varying stages of production, plus nearly twenty TV shows either broadcast or soon to be broadcast over the air or on various streaming services.  Made by [[Marvel Comics]]' own film division, Marvel Studios, it blends a remarkable faithfulness to the original material with an utter fearlessness when it comes to adding twists and changes that keep the properties and plot lines fresh and surprising for even the most dedicated fan.  See our page here about it for more information than can reasonably fit here.

===  Literature  ===
* The [[Cthulhu Mythos]] is a famous example of this; professional fan fiction set in his world is not only published, but was also acknowledged and supported by Lovecraft before his death.
** Speaking of which, showing that this Trope is [[Older Than They Think]], Lovecraft and [[Robert E. Howard]] were contemporaries, and Howard's works took place in the same world as Lovecraft's, just a different time period. The proof? In Lovecraft's story "A Shadow of Time", he introduces a character named Cromia, who is described as "a Sumerian chieftain", Sumeria being [[Conan]]'s homeland and Crom being the deity he is devoted to. 
* The ''[[Wild Cards]]'' books were designed as Shared Universe [[Anthology|Anthologies]] from the ground up.
* ''[[Border Town]]'' is a city between the "real world" and Faerie. It was originally created by Terri Windling, but Emma Bull, Will Shetterly, [[Charles de Lint]] and several other writers have written stories set there.
* ''[[1632]]'' was originally to be a one-off novel, but due to favorable fan response went beyond that, later expanding into ''The Grantville Gazette'', one of whose main goals is to give previously unknown authors a way to be published, and paid for their work. Unlike with many anthologies, the contributions from other authors affect the "main" story line works. There are very few aspects that are truly forbidden to these authors, primarily those where it would interfere with the prerogatives of Eric Flint, the series creator.
* ''[[Thieves' World]]'' was a [[Darker and Edgier|dark fantasy]] Shared Universe created by [[Robert Asprin]] in the late 1970s. It had contributors like [[Poul Anderson]], [[John Brunner]] and [[Marion Zimmer Bradley]] and generated 12 anthlogies of short stories, seven official novels and a bunch of roleplaying adaptations before writing stopped in 1989. It preemptively dealt with [[Continuity Snarl]] with a preface framing story about an old timer talking to a new arrival in the city about how one should not believe everything in the stories one hears, as everyone spins the stories to fit their agendas, to make themselves sound more important in a good story, or less to blame in a bad one, and two people telling the same story may have wildly different variations.
* The universe of the ''[[Bolo]]'' super-tanks has been shared by everyone from John Ringo to Mercedes Lackey.
* The Russian ''[[Death Zone]]'' series is worked on by several known Russian sci-fi authors and is loosely based on the ''[[STALKER]]'' games. Unfortunately, this tends to create certain [[Canon Discontinuity|lapses in continuity]]. For example, in [[Andrei Livadny]]'s novels, the Order is portrayed as a rational group that believes in the existence of an other-dimensional point known as the Node based purely on empirical evidence. In [[Roman Glushkov]]'s books, they are fanatics spouting religious nonsense about the Holy Node before sacrificing themselves for the cause. It could be explained that these are different members of the Order interpreting their teachings, if they were not using the same characters.
* The ''[[Liavek]]'' anthology series- stories by several different authors, set in and around the titular city. Apparently Liavek started out as a RPG invented by Will Shetterly for his writer's group, The Scribblies; they later fleshed out the setting and produced five volumes of short stories (and a few poems). Two of the authors -- [[John M. Ford]] and [[Pamela Dean]] -- later wrote more stories in the same universe.
* The Midnight Rose collective, a group of British SF writers, published several shared-universe anthologies in the early 1990s, with settings including ''[[Temps]]'' (tongue-in-cheek superhero stories) and ''The Weerde'' (shape-shifting aliens are the source of all the world's myths and conspiracies). Contributors included [[Stephen Baxter]], [[Neil Gaiman]], [[Mary Gentle]], [[David Langford]], [[Kim Newman]], and [[Charles Stross]].

===  Live-Action TV  ===
* The [[Disney Channel Universe]], which is comprised of ''[[Even Stevens]]'', ''[[That's So Raven]]'', ''[[The Suite Life of Zack and Cody|The Suite Life of Zack and Cody/On Deck]]'', ''[[Hannah Montana]]'', ''[[Cory in The House]]'', ''[[Wizards of Waverly Place]]'', ''[[Zeke and Luther]]'', ''[[I'm in The Band]]'', ''[[Pair of Kings]]'', ''[[A.N.T. Farm]]'', and ''[[Kickin It]]''.

===  Multi-Type  ===
* [[Older Than Steam]]: Perhaps the oldest non-mythology example is the ''Jianghu'' (literally "rivers and lakes") fantasy world in which most Chinese [[Wuxia]] books, films, TV series, etc. are set. Jianghu dates at least to the 14th-century novel ''[[Water Margin]]''.
* Each ''[[Dungeons & Dragons]]'' campaign setting is its own [[The Verse|'Verse]] (See the page on D&D for more information), and the associated novels have many different authors, though - like the ''[[Star Wars]]'' [[Expanded Universe]] - the writers usually have to clear their ideas through the universe's owner.{{context|reason=How is this an example of the trope as written?}}
** ''Dungeons and Dragons'' also has all of the settings linked in ''[[Planescape]]'' and ''[[Spelljammer]]'', but those are rarely mentioned as existing except for their own continuities.
*** Given that ''[[D20 Modern|Urban Arcana]]'' is our Earth, [[The Masquerade|only with hidden fantasy elements]], the Earth that ''Forgotten Realms'' canonically is connected to<ref>And ''hilariously'' so: among other things, the first edition of the ''Forgotten Realms Campaign Setting'' was canonically written with the help of Elminster</ref> is probably that Earth. ''Planescape'', at least, has a connection to ''Urban Arcana'' via a shared character that namedrops Sigil and has a way to traverse the Shadow that otherwise acts as a boundary between ''Urban Arcana'' and the rest of the multiverse.
* The ''[[Warhammer 40,000]]'' universe is shared by a large number of writers; the sheer scale of the setting in both space and time helps avoid continuity problems.
** In early versions of the background, it was heavily hinted that the ''Warhammer Fantasy'' world was part of a planet cut off from the rest of the universe by warp storms, explaining the many shared elements. However, mentioning this nowadays is liable to get you bundled into a van and never seen again.
* ''[[Spells 'R' Us]]'' was started off with Bill Hart's story "A Strangeness at the Frat House" and then became not so much a universe but a single series of the same character in the same [[The Little Shop That Wasn't There Yesterday|errant shop]] all ending up with customers being transformed into something.

=== Web Original ===
* By definition, roleplaying boards such as ''[[Survival of the Fittest]]'' are Shared Universes, since each handler has his own spin on the story.{{context|reason=How is this an example of the trope as written?}}
* The ''[[Whateley Universe]]''. Right now{{when}}, there are about a dozen authors writing about twice that many main characters. And that doesn't count the [[Fanfic]].
* Many [https://web.archive.org/web/20100501075410/http://www.teleread.org/category/paleo-e-books/ Internet writing circles] take the form of shared universes. Some such universes have been around continuously since the mid-1980s.
* The Randomverse contains multiple roleplays run by different people. They include ''[[The Death Series]], [[The Insane Quest]]'', and ''[[Smile for The Camera]]''.
* Jason Bortz, M. S. Patterson, and Christopher Wright share a universe informally titled "The Foldspace Universe." It's the setting for ''[[Pay Me, Bug!]]'', among others.
* "In My World" and "Inspector Dan Rather" seem to take place in the same over-the-top-ridiculous universe, although they are told from very different points of view and rarely overlap. [http://iowahawk.typepad.com/iowahawk/2004/09/rather_blames_r.html The only "Inspector Dan Rather" story not told from Rather's delusional point-of-view] seems to confirm this.
* Several "imprints" on the superhero fiction newsgroup rec.arts.comics.creative, notably the [[Legion of Net.Heroes]] and [[Academy of Superheroes]].
* ''[[Fenspace]]'', among other projects at [http://accessdenied-rms.net/forums/index.php the Drunkard's Walk Forums].

===  Web Comics  ===
* The ''[[International ComicContinuity]]]'' was created specifically to make a Shared Universe.


== Because they have too few writers, these are '''''not''''' examples of Shared Universes, and should be moved to either [[The Cameo]], [[Crossover]], or [[The Verse]]: ==
===  Anime and Manga  ===
* A truly bizarre case is ''[[GaoGaiGar]]'' and ''[[Betterman]]'', which take place in the same universe despite the former being a [[Super Robot]] [[Reconstruction]] and the later a [[Real Robot]] horror series.
* ''[[Dragon Ball]]'' and ''[[Doctor Slump]]''
* ''[[Cromartie High School]]'' and ''[[Di Gi Charat]]''
* Studio Trigger has done this with their series ''[[Space Patrol Luluco]]'', where it's established that each one of their series takes place on their own planet.

===  Literature  ===
* [[C. S. Lewis]] linked [[The Space Trilogy|his world]] to his friend Tolkien's [[The Silmarillion|universe]] in ''That Hideous Strength''.
* Susannah Clarke's short story ''The Duke of Wellington Misplaces His Horse'' connects the universes of her novel ''[[Jonathan Strange & Mr Norrell]]'' to that of Neil Gaiman's novel ''[[Stardust (novel)|Stardust]]''.
** Hang on, isn't ''Stardust'' already implied to be part of the ''[[American Gods]]'' -verse already too?
* All of [[Simon R. Green]]'s series appear to inhabit the same universe.

===  Live-Action TV  ===
* ''[[Warehouse 13]]'' and ''[[Eureka]]'' share a universe with ''[[Alphas]]''.
* ''[[CSI]]'', ''[[CSI: NY]]'', ''[[CSI: Miami]]'', ''[[Cold Case]]'' and ''[[Without a Trace]]'' are all in the same universe.
* After a great many hints in the various [[Dan Schneider]] shows, ''[[iCarly]]'' canonized that it exists in the same universe as ''[[Drake and Josh]]'', ''[[Zoey 101]]'' and ''[[Victorious]]''.
* The various seasons of ''[[Power Rangers]]'' are shown to exist in the same Universe. This was most obvious in the early years of the series, which had one, continuing storyline culminating in ''[[Power Rangers in Space]]''. Later seasons tend to downplay this, but the various crossovers and reappearing characters establish that the universe is the same. However, ''[[Power Rangers RPM]]'' takes place in an [[Alternate Universe]], something not made obvious until its crossover with ''[[Power Rangers Samurai]]''.
* ''[[JAG]]'',''[[NCIS]]'', ''[[NCIS: Los Angeles]]'' and the new ''[[Hawaii Five-0]]'' are a shared world, as evidenced by Kensi's presence in Hawaii. You can add the MacGyver and Magnum P.I. reboots as well.{{context|reason=How is this an example of the trope as written?}}
* All the ''[[Law and Order]]'' series share a world with ''[[Homicide: Life on the Street]]'', due to [[John Munch]].
* The Filmways-produced ''[[Petticoat Junction]]'' and ''[[Green Acres]]'' were both set in the town of Hooterville, and characters from each gravitated to the other fairly regularly.{{context|reason=How is this an example of the trope as written?}}
** There were also frequent crossovers with ''[[The Beverly Hillbillies]]''.
* "The Girls Of Hollywood High," the second of ''two'' [[Poorly-Disguised Pilot]]s (for a proposed series about Texan private detectives called ''[[Incredibly Lame Pun|Eyes Of Texas]]'') which aired as ''[[BJ and the Bear]]'' episodes, established that this shares a universe with another Glen A. Larson series - at one point the female PIs pay a visit to the Los Angeles Coroner's Office. John S. Ragin and Robert Ito turn up as the characters they play on that particular series, but Jack Klugman, alias ''[[Quincy]]'', is conspicuously ([[Creative Differences|and given how he felt about Glen Larson understandably]]) absent.
* The [[Power Rangers]] and the [[Teenage Mutant Ninja Turtles]], given the crossover between ''[[Power Rangers in Space]]'' and ''[[Ninja Turtles: The Next Mutation|Teenage Mutant Ninja Turtles: The Next Mutation]].'' Curiously, each team initially [[Faeries Don't Believe in Humans, Either|seemed to think the other was fictional.]] 

===  Multi-Type  ===
* [[Word of God]] places ''[[Dr. Horrible's Sing-Along Blog]]'', ''[[The Tick (animation)|The Tick]]'' and the ''[[Venture Brothers]]'' in the same universe.
** The [[Mutant Enemy|Edlundverse]] perhaps?{{verify}}

===  Video Games  ===
* ''[[Portal (series)|Portal]]'' shares a universe with ''[[Half-Life (series)|Half-Life]]''.
* The ''[[Super Mario]]'' and ''[[Donkey Kong]]'' series exist in the same universe, as shown through Donkey Kong, Diddy, Dixie, and Funky appearing in Mario spin-offs, as well as Mario and Yoshi appearing in Donkey Kong Country 2. Additionally, due to first appearing in ''Super Mario World'' and ''Super Mario Land 2'' respectively, the ''Yoshi'', ''[[Wario Land]]'', and ''[[Wario Ware]]'' series are also part of the expanded Super Mario Universe. The entire Shared Universe of Mario, however, is much, MUCH larger.
* ''[[Street Fighter]], [[Final Fight]]'', ''[[Saturday Night Slam Masters]]'' and ''[[Captain Commando]]'' take place in the same universe. ''[[Rival Schools]]'' may also be part of it.
** A few ''Final Fight'' characters (namely Guy, Sodom, Rolento, and Cody) have appeared as fighters in the ''[[Street Fighter Alpha]]'' series, with stages and endings featuring cameos by other characters. Andore appears in ''[[Street Fighter III]]'' under the name of "Hugo" with Poison acting as his manager. Both, Guy and Cody returned in ''[[Street Fighter IV|Super Street Fighter IV]]''. Additionally, Chun-Li makes a cameo in Stage 1 of ''Final Fight 2'' and the portable versions of ''Alpha 3'' features Maki as an extra character.
** Haggar appeared in ''Slam Masters'' as a wrestler. The U.S. localization refers to him as the "former mayor of Metro City", although the original Japanese storyline actually places the games before Haggar was elected. A couple of ''Street Fighter'' characters have cameos in the ''Slam Masters'' series (such as Chun-Li, Honda, and Balrog) and the Slam Masters are referenced in Hugo's ending in ''2nd Impact''.
** ''Captain Commando'' takes place in a futuristic version of Metro City. A sculpt of Mike Haggar is featured in the game as an bonus item, and Ginzu the Ninja is a future successor of Guy in the Bushin style of Ninjutsu.
** The first ''Rival Schools'' features Sakura as a playable character (although, her blood type is different from the one given in the ''Alpha'' series). Moreover, the ''Nekketsu Seisyun Nikki'' spin-offs has Hinata studying the "Ken Masters style of Karate" and Iinchou/Chairperson learning "Saikyou-Style" through mail. On the other hand, there are a few date discrepancies according to the first game's intro and Sakura's storyline (in which she's yet to meet Ryu, placing the series pre-''[[Street Fighter Alpha]] 3'').
** While not part of the main ''Street Fighter'' continuity, the Arika-developed ''[[Street Fighter EX]]'' games shares a couple of characters (Allen and Blair) with their independently developed arcade game ''[[Fighting Layer]]''.
** The setting of ''[[Asura's Wrath]]'' might be{{verify}} a "before the beginning" version of this world, assuming the policewoman in the epilogue is indeed Chun-Li and not just an inside-joke [[Captain Ersatz]].
* Koei's ''[[Warriors Orochi]]'' was made to confirm that its series ''[[Dynasty Warriors]]'' and ''[[Samurai Warriors]]'' take place in the same universe but the second trailer of ''Warriors Orochi 3'' more or less confirms Koei's other games ''[[Warriors: Legends of Troy]]'' and ''[[Blade Storm: The Hundred Years War]]'' due to the presence of Achilles and Jeanne D'Arc. But it also confirms that its business partner Tecmo series ''[[Ninja Gaiden]]'' and ''[[Dead or Alive]]'' series take place there due to the presence of Ryu Hayabusa. By extension it might also might also put it in the same universe as ''[[Halo (series)|Halo]]'' due to the Spartan Nicole's presence in ''Dead Or Alive 4''.
* The ''Ultima'' series features references to the ''Wing Commander'' series. In ''Ultima I'' there were spaceships that in ''Ultima 7: The Black Gate'' was explained to be the spaceship of the Kilrathi. As pointed out by [[The Spoony Experiment|Spoony]] [https://web.archive.org/web/20130807102450/http://spoonyexperiment.com/2011/02/01/ultima-7-the-black-gate-review/ here.]
* ''[[Dig Dug]]'', ''Baraduke'' (or ''Alien Sector'' if you prefer), and ''[[Mr. Driller]]'' are set in the same world, by virtue of Taizo Hori and [[Gender Blender Name|Toby]] [[Dub Name Change|"Kissy"]] [[Samus Is a Girl|Masuyo]] being the parents of Susumu, Ataru, and Taiyo Hori (the first of the three being [[The Hero]] of the ''[[Spinoff Babies|Mr. Driller]]'' series) and the events of the first ''Dig Dug'' being referenced directly in ''Mr. Driller'' (the "Dig Dug incident").
* ''[[EVE Online]]'' and the upcoming{{when}} FPS ''[http://www.youtube.com/watch?v=Hat4psYcvII&feature=relmfu DUST 514]'' are part of the same universe... ''literally''. Players will be able to accept contracts and do missions for the player-run companies of ''[[EVE Online]]'', and even form their own corporations that ''[[EVE Online]]'' players will be able to join.
* The ''[[Dead or Alive]]'' and ''[[Ninja Gaiden]]'' series both take place in the same universe, complete with having characters originating in one becoming plot-integral in the other. Of course, characters will change looks to match the art style of the respective games.
* The presence of both Seath the Scaleless and Patches the Hyena seem to indicate that ''[[Dark Souls]]'' shares the same world and universe as the ''[[Kings Field]]'' series and ''[[Demon's Souls]]''.
* [[Broderbund Software]] tried to work the Bungeling Empire into most of its early 1980s action games. ''Choplifter'' and ''[[Lode Runner]]'' had it [[All There in the Manual]]; ''Raid on Bungeling Bay'' had it in the title but wasn't really a sequel to anything.
* ''[[Space Harrier]]'' is set in the Fantasy Zone; several ''[[Fantasy Zone]]'' games reference it to various degrees. The culmination of this was the unreleased crossover game ''Space Fantasy Zone''.

===  Web Comics  ===
* Webcomics tend to be chock full of [[Crossover]]s and [[Shout-Out]]s, but very few non-[[Spin-Off]] comics have Shared Universes. Among those that do:
** ''[[Something*Positive]]'' and ''[[Queen of Wands]]/[[Punch and Pie]]''
** More recently{{when}}, ''[[Something*Positive]]'' and ''[[Girls with Slingshots]]''
** Also recently{{when}}, ''[[Something*Positive]]'' and ''[[Penny and Aggie]]''
** ''[[Melonpool]]'' and the [[Walkyverse]]
*** In fact, all of the above apparently share a universe now, since characters from ''[[Something*Positive]]'' and ''[[Girls with Slingshots]]'' have recently{{when}} appeared in ''[[Walkyverse|Shortpacked!]]''.
*** ''[[Questionable Content]]'' as well, though mainly as the odd cameo (and an implied spacewarp between the Shortpacked store and Coffee of Doom, which is actually pretty reasonable by QC standards at least.)
**** ''Questionable Content'' also shows Kim Ross, cybernetic protagonist of ''[[Dresden Codak]]'', laughing at Pintsize's mishaps in an IRC.
*** The pre-reboot version of ''[[Zortic]]'' was also part of the Melonpool-verse. Ralph and Splink were officially half-brothers. This hasn't been mentioned since the reboot.
*** [[Melonpool|Melonpool, Ralph,]] [[Zortic|Splink, and Zortic]] have all appeared in ''[[The Inexplicable Adventures of Bob]]'' Aparently Voluptua knows Ralph and Splink's family.
** ''[https://web.archive.org/web/20131102122158/http://www.nekothekitty.net/ Neko The Kitty]'' and ''[http://www.catharsiscomic.com/ Catharsis]'' not only share a universe, they share an apartment building.
** ''[[The Wotch]]'' and ''[[The Accidental Centaurs]]''
** Ryan North believes that his ''[[Dinosaur Comics]]'' and Andrew Hussie's ''[[Homestuck]]'' share a universe.

=== Western Animation ===
* ''[[Rugrats]]'', ''[[The Wild Thornberries]]'', and ''[[Rocket Power]]''.{{context|reason=How is this an example of the trope as written?}}
* ''[[Family Guy]]'' and ''[[The Cleveland Show]]'', along with ''[[American Dad]]''.{{context|reason=How is this an example of the trope as written?}}
* A subtle link exists among four of Marvel and Sunbow's [[Merchandise-Driven]] 1980s cartoons — the character of Hector Ramirez, a [[No Celebrities Were Harmed|thinly veiled]] [[Parody]] of Geraldo Rivera, appears in ''[[Inhumanoids]]'', ''[[G.I. Joe]]'', ''[[Transformers Generation 1]]'' and ''[[Jem]]'', though this has not been confirmed.{{context|reason=How is this an example of the trope as written?}}
** In ''[[Transformers Animated]]: The [[All Spark]] Almanac II'', Vector Prime confirms that all these shows and ''[[COPS (animation)|C.O.P.S.]]'' take place in the ''Transformers generation 1'' continuity.
* Since the ''[[Looney Tunes]]'' characters are the teachers to the ''[[Tiny Toon Adventures]]'' characters, this makes an obvious example. A not-so-obvious addendum to this is that the ''Looney Tunes'' characters also made several cameos on ''[[Animaniacs]]'' and ''[[Histeria!]]'', which therefore means they too share the same universe. Additionally, the ''[[Animaniacs]]'' characters made cameos on ''[[Freakazoid!]]!'' (and vice versa) so this also makes this part of the WB Animated Universe ([[Fan Nickname|as it has been nicknamed]]).
* While it's pretty obvious that ''[[DuckTales (1987)]]'' and ''[[Darkwing Duck (animation)|Darkwing Duck]]'' share the same universe due to sharing one of the main characters, ''[[The Legend of the Chaos God]]'' storyline in ''[[Disney Adventures]]'' also placed ''[[Tale Spin]]'', ''[[Chip 'n Dale Rescue Rangers (animation)|Chip 'n Dale Rescue Rangers]]'' and ''[[Goof Troop]]'' in it as well.
** Disney did something similar years later by placing all of its then-running shows into the same universe by giving each show a [[Crossover]] with ''[[Lilo & Stitch: The Series]]'': ''[[Kim Possible]]'', ''[[American Dragon: Jake Long]]'', ''[[The Proud Family]]'' and ''[[Recess]]''.
*** If we take Kim's inserted cameo into the "Spot the Diff" version of a ''[[Phineas and Ferb]]'' episode into account, this apparently means that Phineas and Ferb also inhabit that universe.
* The ''[[DCAU]]''.
* The [[Cartoon Network]] universe was first established with "[[Crisis Crossover|The Grim Adventures of the KND]]". It consists of:
** ''[[Codename: Kids Next Door]]''
** ''[[The Grim Adventures of Billy & Mandy]]''
** ''[[Ed, Edd 'n' Eddy|Ed, Edd, and Eddy]]''
** ''[[The Powerpuff Girls]]''
** ''[[Dexter's Laboratory]]''
** ''[[My Gym Partner's a Monkey]]''
** ''[[Foster's Home for Imaginary Friends]]''
** ''[[Squirrel Boy]]''
** Arguably ''[[Camp Lazlo]]'' as well due to being part of the [[Cross Through|CartoonNetwork Invaded crossover]] event.
*** The CN Invaded event was one of four EEnE specials that were mentioned in the EEnE movie.
** Earlier, it was established that ''[[The Powerpuff Girls]]'' and ''[[Dexter's Laboratory]]'' shared a universe. While Dexter and the girls sadly never (officially) met, both parties have met [[The Justice Friends]]. Dexter himself made constant [[The Cameo|cameos]] in ''PPG'' to the point where it was practically a [[Running Gag]].
* ''[[Usagi Yojimbo]]'' and pretty much any version of ''[[Teenage Mutant Ninja Turtles]];'' Usagi will usually make at least one guest appearance per series, due to a long friendship between Stan Sakai and Turtles creators Kevin Eastman and Peter Laird. Sakai even wrote one episode of the 2012 series, and both that and the 2003 series had episodes overlapping into Usagi's world, sadly the closest there has ever been to an Usagi Yojimbo cartoon. 
* ''[[Gravity Falls]]'' and ''[[Rick and Morty]],'' probably, for the same reason as Usagi and the Ninja Turtles. The numerous references each cartoon makes to the other seems to clinch it.

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