Shared Universe

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 go back centuries, and even further and 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.

Examples of Shared Universe include:

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 thus Z and GT), Doctor Slump, Nekomajin, Jaco the Galatic Patrolman, and pretty much every other manga written by Akira Toriyama occupy the same universe.
• Cromartie High School and Di Gi Charat

Comic Books

• The various realities of Marvel Comics.
  • The Marvel Universe of Earth-616.
  • The Ultimate Marvel universe, Earth-1610.
• 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 dimension, several canonical crossovers and a few characters who break the fourth wall.
• Ninja High School and 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, and Bone have made appearances. Aside from that, Erik Larsen likes to 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, Zephyr Noble, Fire Breather, and Shadowhawk.
• The Hasbro Comic Universe was a short-lived experiment of IDW Publishing's that featured several of Hasbro's sci-fi properties, based on the backdrop of their pre-existing Transformers Robots in Disguise comic.
• IDW's love for Transformers crossovers means that the Cybertronian race exists in the Expanded Universes of Ghostbusters and Star Trek.

Fan Fiction

• 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 fan fiction writers love to include enough elements from The Nowakverse into stories of their own, especially the main original characters.
• There Was Once An Avenger From Krypton is a series of largely unrelated fics that all take place in the same setting, a Mega Crossover Alternate Universe based off Phase 1 of the Marvel Cinematic Universe.

Film

• The Marvel Cinematic Universe. It's a Live Action Adaptation of Marvel Comics that features several Crisis Crossovers between the various superheroes. When not interacting, the individual characters frequently mention the Avengers, usually Iron Man, S.H.I.E.L.D. and the Infinity Stones. It even produced several spin-off television shows.
• DC Comics followed with the DC Extended Universe.
• Going by a quick cameo, Tangled and Frozen take place in the same universe. Wish all but confirms that most of the Disney Animated Canon takes place in the same universe.

Literature

• The Cthulhu Mythos is a famous example of this; professional fanfiction set in his world is not only published, but was also acknowledged and supported by Lovecraft before his death.
• C. S. Lewis linked his world to his friend Tolkien's 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 and Mr. Norrell to that of Neil Gaiman's novel Stardust.
  • Hang on, isn't Stardust already implied to be part of the American Gods -verse already too?
• The Wild Cards books were designed as Shared Universe 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 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 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 otherdimentional 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.
• All of Simon R Green's series appear to inhabit the same universe.
• Rick Riordan's Urban Fantasy works; Percy Jackson & the Olympians, The Kane Chronicles, The Heroes of Olympus, Magnus Chase and the Gods of Asgard; take place in the same universe. They don't interact too much because the various pantheons try and stay out of each other's ways.
• The Time Machine by H. G. Wells appears to take place in the same universe as The First Men in the Moon and The War of the Worlds.

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, the Nick Verse, as Drake and Josh, Zoey 101 and Victorious.
• The DCLAU, the Disney Channel Live Action Universe, which is comprised of Even Stevens, That's So Raven, 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, ANT Farm, Kickin It, Austin & Ally and Girl Meets World.
• 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.
  • Masked Rider and Ninja Turtles: The Next Mutation are also established as being in the universe via crossovers, though Time Force shows that the majority of the former is a Show Within a Show. In printed material from the 1990s, Big Bad Beetleborgs was also added, and VR Troopers flip-books appeared alongside PR material, and a character from VR Troopers was meant to be Zeo's Gold Ranger. However, The Mystic Knights of Tir Na Nog and Los Luchadores remain the only Saban Toku to not be connected to PR in any way.
  • Meanwhile in Japan, Super Sentai is in the same universe as Kamen Rider and Metal Heroes, while the Toei Fushigi Comedy series remained unconnected for years until the Gavan revival.
• JAG,NCIS, NCIS: Los Angeles and the new Hawaii Five-O are a shared world, as evidenced by Kensi's presence in Hawaii.
• All the Law & 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.
  • Also frequent crossovers with The Beverly Hillbillies.
• "The Girls Of Hollywood High," the second of two Poorly-Disguised Pilots (for a proposed series about Texan private detectives called 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 (and given how he felt about Glen Larson understandably) absent.
• The Arrowverse. It started out just as Arrow before it expanded to include The Flash and Legends of Tomorrow, all existing on Earth-1. It then incorporated the initially unrelated Constantine as well as Supergirl and Black Lightning. The latter two initially took place on different Earths before a Merged Reality was created in an adaptation of Crisis on Infinite Earths.
• The 2005 revival of Doctor Who produced two spin-offs, Torchwood and The Sarah Jane Adventures, which take place in the Whoniverse just like their parent show. Crossovers between the spin-offs never occurred, due to SJA being very Lighter and Softer and RTD fearing that a crossover might encourage kids to watch the Darker and Edgier Torchwood, but all three shows came together in the Series 4 finale of Doctor Who to fight a Dalek invasion.
• All the Star Trek television shows naturally take place in the same universe. The events of Star Trek: Deep Space Nine were mentioned in Star Trek: First Contact, Star Trek: Insurrection and Star Trek: Voyager.
• Per Word of God, Sherlock takes place in the same universe as Daniel Craig's James Bond.

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 and Dragons campaign setting is its own '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.
  • 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 Urban Arcana is our Earth, only with hidden fantasy elements, the Earth that Forgotten Realms canonically is connected to 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 40000 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.
• Word of God places Dr. Horrible's Sing-Along Blog, The Tick and the Venture Brothers in the same universe.
  • The Edlundverse perhaps?
• 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 errant shop all ending up with customers being transformed into something.

Video Games

• Portal shares a universe with 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 perhaps much, MUCH larger. At the very least, it also includes Punch-Out!, due to Mario characters making in-person appearances within, Gyromite, the Game and Watch games, Banjo-Kazooie, and Conker.
• Street Fighter, Final Fight, Saturday Night Slam Masters, Rival Schools, and Captain Commando take place in the same universe.
  • 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 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 the future 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. On the other hand, the game is never mentioned in any of the other games in the universe.
  • 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 quite 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.
    • Other games, such as Asura's Wrath, Strider, Darkstalkers (and possibly henceforth Ghosts & Goblins & Maximo), Forgotten Worlds , Pirate Ship Higemaru , and even Tekken are also implied to be in this universe. A number of other Capcom games are indicated as a Show Within a Show in this universe
• Koei's Warriors Orochi was made to confirm that it's 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 it's 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 the Halo Series 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 Spoony 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 Toby "Kissy" Masuyo being the parents of Susumu, Ataru, and Taiyo Hori (the first of the three being The Hero of the 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 FPS 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 Demons 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.

Webcomics

• Webcomics tend to be chock full of Crossovers and Shout-Outs, 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, Something Positive and Girls with Slingshots
  • Also recently, 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 appeared in 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, Ralph, Splink, and Zortic have all appeared in The Inexplicable Adventures of Bob Aparently Voluptua knows Ralph and Splink's family.
  • Neko The Kitty and 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.
  • The International Comic Continuity was created specifically to make a Shared Universe.

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.
• The Whateley Universe. Right now, there are about a dozen authors writing about twice that many main characters. And that doesn't count the Fanfic.
• Many 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, Smile for The Camera and TV Tropes the Adventure.
• 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. 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.

Western Animation

• Rugrats (and therefore All Grown Up and Angelica & Suzie's Pre-School Daze), The Wild Thornberries, and, only through a comic book story, Rocket Power. Presumably also Aaaah! Real Monsters!, as the three main characters made an appearance on the formermost.
• Family Guy, The Cleveland Show and American Dad! all take place in the same universe, the three leads interacting in the "Hurricane!" crossover. Though American Dad! and Family Guy are sometimes television shows in the other.
• A subtle link exists among four of Marvel and Sunbow's Merchandise-Driven 1980s cartoons — the character of Hector Ramirez, a thinly veiled Parody of Geraldo Rivera, appears in Inhumanoids, G.I. Joe, The Transformers and Jem, though this has not been confirmed.
  • In Transformers Animated: The AllSpark Almanac II, Vector Prime confirms that all these shows and C.O.P.S. take place in the continuity of the original Transformers cartoon. Early plans for the first My Little Pony movie would have had some characters from Transformers and G.I. Joe show up, meaning it is probably in this universe as well. It would later be established that most of Hasbro's properties do take place in the Transformers multiverse meaning that, for example, Cybertron exists in every G.I. Joe timeline, though it does not appear that the opposite, such as G.I. Joe existing because Cybertron does, holds true.
• 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 and Tiny Toons characters also made several cameos on Animaniacs and Histeria!, which therefore means they too share the same universe, cemented by Elmyra being added to Pinky and the Brain. Additionally, the Animaniacs characters made cameos on Freakazoid! (and vice versa), but only in a Welcome to the Real World storyline. We can also add Taz-Mania and The Sylvester and Tweety Mysteries, two more animated series at the time featuring Looney Tunes characters.
• While it's pretty obvious that DuckTales and 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 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 and 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 "The Grim Adventures of the KND". It consists of:
  • Codename: Kids Next Door
  • The Grim Adventures of Billy and Mandy
  • Ed, Edd 'n' 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 CartoonNetwork Invaded crossover event.
    • The CN Invaded event was one of four Ed, Edd 'n' Eddy specials that were mentioned in the Ed, Edd 'n' Eddy 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 cameos in PPG to the point where it was practically a Running Gag.
  • Grim Adventures had many appearances by Hanna-Barbera characters, meaning it's likely part of the H-B universe. This means Harvey Birdman, Attorney at Law is also presumably part of this. Henceforth also Space Ghost: Coast to Coast, a link further proven by his appearance in the Punch Time Explosion game as the narrator, and thus Aqua Teen Hunger Force.
• The second season of Amphibia strongly implied that the show shared continuity with The Owl House. Season 3 of The Owl House confirmed this.