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Nick Fury: You think you're the only superhero in the world? Mr. Stark, you've become part of a bigger universe. You just don't know it yet.
Tony Stark: Who the hell are you?
Nick: Nick Fury, director of S.H.I.E.L.D.. I'm here to talk to you about the Avenger Initiative.
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When The ’Verse is shaped by multiple creators writing independently, such as how many different comic book titles can be set in a collective continuity. This makes 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.

As a rule, simply having a Crossover is not enough to qualify as a Shared Universe, as those tend to be standalone stories and have no further connections beyond that. Major events should be referenced across the different projects or characters are mentioned as having their own adventures somewhere else.

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.

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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:

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    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 latter a Real Robot horror series.
  • Cromartie High School and Di Gi Charat.
  • Dragon Ball: Dragon Ball, Dr. Slump, and Jaco the Galactic Patrolman (plus its short spin-off Sachie-chan Guu!) share a universe; the main characters from all three series even met each other in a filler episode of Dragon Ball Super. Neko Majin is set here, though its parodic nature makes it canon status dubious, and Pola and Roid, Tomato, Girl Detective, Jiya, and Wonder Island all connect to Dr. Slump via cameos, placing them here too. Various other limited series and one-shots from Toriyama such as Cashman are possibilities given the vast scope of universe and very similar designs for technology and characters, but that could just be Toriyama recycling (like how Satan in Sand Land happens to look exactly like Dabra from Dragon Ball).
  • The Yu-Gi-Oh! universe consisting of the NAS adaptation and all most of its spin-offs.
  • Hayate the Combat Butler and Sore ga Seiyuu!.
  • Detective Conan and Magic Kaito exist in the same universe. In fact Kaito Kid is a reoccurring nemesis for Shinchi Kudo/Conan Edogawa, and is even his Evil Twin of sorts. Technically Yaiba would be in the same universe too, although that's more of a Show Within a Show.
  • Teasing Master Takagi-san and Fudatsuki no Kyouko-Chan by the same author are in a shared universe. Mina, Sanae, and Yukari from Ashita wa Doyoubi make cameos in one chapter of Fudatsuki no Kyouko-Chan, Mina Hibino herself is likely related to Haruka Hibino from Fudatsuki no Kyouko-Chan.
  • Sword Art Online and Sword Art Online: Alternative Gun Gale Online exist in the same universe and occur alongside each other, only focusing on different sets of characters. However the events from Sword Art Online are constantly mentioned in Gun Gale Online. Accel World appears to exist in the same universe too, but it's set 21 years in the future from SAO so it's a lot less apparent.
  • Eromanga Sensei and Oreimo take place in the same universe. Not surprising, as they're both written by the same author. It wasn't too obvious in the beginning, but was made very clear when Kyousuke, Kirino, Kuroneko, and Saori make a cameo in episode 11 of Eromanga Sensei.
  • Leiji Matsumoto has a connected universe too - of a sorts, since continuity has never been his thing. But you get Harlock showing up on the Galaxy Express, Cosmo Warrior Zero saw the hunt for Harlock from the other side. Yamato would have had a Harlock encounter, but it was cut for time (but the Yamato has shown up in the background in some of Harlock).

    Comic Books 
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    Comic Strips 

    Fan Works 
  • YuYuGiDigiMoon has a shared universe consisting of Yu Yu Hakusho, Yu-Gi-Oh! (up to 5D's), Digimon (which starts off with Tamers and Frontier, then Adventure/02 and Data Squad are added), and Sailor Moon.
  • The My Little Pony: Friendship Is Magic stories Rainbow in the Dark and Racer and the Geek have small nods, links and references. Both authors have implied that their stories exist in the same universe, although perhaps not in the same continuity. This is still completely nebulous.
  • The My Little Pony: Friendship Is Magic fanfic Black Queen, Red King by wille179 and Gatekeeper: Prince of Darkness by InfiniteBrony are two sides to the same story, crossing over at several points. Even more authors are attempting to join, according to Word of God.
  • 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 RadiantBeam, 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.
  • Most fanfiction writers seem to incorporate Ranma ½, InuYasha, and other works by Rumiko Takahashi in the same universe.
  • Similarly, it's almost more common to see writers have Sailor Moon and Ranma in a shared universe than not, most times with the justification that "They're from different wards in Tokyo" (Minato and Nerima, respectively).
  • Harry Potter fanfiction often has cameos from Wizards of Waverly Place and Hellsing, due to the similar premises of the first and the second occurring in England as well. Crossovers with Percy Jackson are also not uncommon.
  • Naruto and Bleach cross over so much that it is very common to see OC ninja share their names instinctively.
  • The bulk of the Pony POV Series is written by the same guy and his editors, but quite a bit of the Recursive Fanfiction has been declared officially canon (or at least Loose Canon) by said author.
  • The Lunaverse is a My Little Pony: Friendship Is Magic AU where Celestia became evil instead of Luna. It started with one story by RainbowDoubleDash who promptly opened it up to anyone else who wants to write in it. Multiple writers took him up on this offer.
  • Lunaverse alum GrassAndClouds2 is now running a Shared Universe of his own, The Cadanceverse. It is music-themed, and features Cadance as the princess (after both Celestia and Luna were corrupted), Octavia as her student, and Vinyl, Fluttershy, Lyra, and two background ponies as the other Element Bearers.
  • Like the Lunaverse, Life in Manehattan (aka the Manehattanverse) is an AU of My Little Pony: Friendship Is Magic, this one based on the premise that the Elements of Harmony were found some time before the pilot and taken to a museum in Manehattan; therefore, it's there that Twilight Sparkle goes for the Summer Sun Celebration, makes friends, and ends up living. The first story by the original author covers the alternate events of the pilot, after which other authors have started writing their own tales of the Manehattan 6.
  • In perhaps the greatest example of universe welding, the efforts of the author of The Elements of Harmony and the Savior of Worlds created the ultimate shared universe. The Discord from a universe where neither Celestia nor Luna were corrupted won for a few years thanks to the plunder seeds, but grew bored, and thus recruited Spike from the Flipverse, Rainbow Dash from the Dashverse, Pinkie Pie from the "Hasbroverse", Ditzy from the Lunaverse, Octavia from the Cadenceverse, and Auntie from the Maehattanverse to go on an epic quest across 6 locations to find that universe's new Elements of Harmony in Multiversal Harmony.
  • After the original Pokéumans story became popular and successful enough to have its own spin-offs on the same concept, these all the share the same universe and characters from one series occasionally appear or get a notable mention in another series. Said shared universe is the world — the real world.
  • The story Avalon by Dave19941000 is an Neon Genesis Evangelion/Marvel Cinematic Universe crossover which shares its setting with the writer's Stargate SG-1/Battlestar Galactica (2003) crossover Brother's Betrayal, and the Stargate SG-1 fanfic Stargate: Triangulum.
  • The Axis Powers Hetalia AU fic Monarchy Over The Danube makes a number of nods to the fanfic Eva by Marj. With Eva herself visiting her sister, the future Danubian Federation.
  • Dragon Ball Z Abridged and Yu-Gi-Oh! The Abridged Series, seeing as how often they've appeared in each other's shows, especially as one video claims that Kaiba is a robot built by Frieza.
  • Pokémon Reset Bloodlines forms the core of what fans have dubbed the Resetverse, containing side stories and one shots.
  • Tye Dye Wildebeest has some of his Loud House fanfics the list  in a shared universe with Peeking Through The Fourth Wall.
  • The Pixar Theory, a fan theory (or group of theories) that postulate that all Pixar movies are part of a shared universe, using the different Easter Eggs as proof of that. Of course, the details of such connection will depend on who you ask,as the theory already has several notable exponents like the credited creator of the theory himself, Jon Negroni, the Super Carlin Brothers, and countless fan theories on Reddit and other forums from many others. In case you're wonder, Pixar creators have already debunked it to varying degrees. Pete Doctor (Monsters, Inc., Up, Inside Out) dismissed it, but admitted that all his films could potentially work within a single universe. Meanwhile, Brad Bird (The Incredibles, Ratatouille) is explicit about all his films (not counting sequels) taking place in different universes, much less all of them being within a larger Pixar-verse.
  • The Altered Destinies is a series of Ranma ½ works of fan fiction looking at alternative histories for the characters. This series can easily cause Archive Panic as not only does each fanfic in it represent an Alternate Universe each author has their own Multiverse. There’s also many cases where the writers themselves aren’t aware that they’re apart of this universe. Either because of Right Hand vs. Left Hand where they use elements from Altered Destinies to write their story unknowingly creating a sequel for example the Pokegirl fanfics, or their story was integrated through Ascended Fanon. For example when Shinobu Saotome was introduced in Thunder in the Mountains many suggested that she originated from It's the shinobi life for us
  • The Many Dates of Danny Fenton (Danny Phantom Western Animation, TV Series, and Comic Books.): In real life, a universe with characters from the likes of Danny Phantom, Kim Possible, Ben 10, 6teen and various Marvel and DC related shows wouldn't work due to rights issues.

    Film — Animation 

    Film — Live-Action 

    Literature 
  • Cthulhu Mythos: A famous and early example of this; professional fanfiction set in his world is not only published, but was also acknowledged and supported by Lovecraft before his death.
  • The Wild Cards Super Hero books were designed as Shared Universe Anthologies from the ground up.
  • Bordertown 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 at professional rates instead of less generous fanzine ones. 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, with a short revival in the early 2000's. 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, originally by Keith Laumer, 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 S.T.A.L.K.E.R. games. Unfortunately, this tends to create certain lapses in continuity. For example, in Andrey 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.
    • Other major differences involve the very nature of the Zones. For example, in Livadny's novels, there is no plant or animal life in the Zones, as anything exposed to the scorgs gets "upgraded" (i.e. it becomes a weird mix of flesh and metal bearing little resemblance to the original). Rust by Aleksey Kalugin shows the Moscow Zone full of plant and, occasionally, animal life with only a few examples of bio-tech mixes. Kalugin's nanobots (the word "scorgs" is never mentioned) only care about consuming metal and reanimating machines.
  • The Liavek anthology series- stories by several different authors, set in and around the city of Liavek. Apparently the setting 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.
  • Merovingen Nights was an anthology series set on the planet Merovingen, in an islolated corner of C. J. Cherryh's Alliance/Union universe.
  • Heroes in Hell was an anthology series with a concept similar to Riverworld: all the dead wind up together in Hell, where they pick up where they left off when still alive.
  • The universe of the Malazan Book of the Fallen was jointly created by Steven Erikson and Ian Cameron Esslemont, and both authors have written their own novels for the setting. This setting is home to:
    • The Malazan Book of the Fallen: Erikson. The main ten-novel sequence comprised of three major Rotating Arcs that eventually converge into a central Myth Arc dealing with the Crippled God.note 
    • Tales from the Malazan Empire: Esslemont. Six loosely-connected novels that deal with events not part of the Malazan Book of the Fallen's major arcs, though they are very significant to the broader world and sometimes pick up lingering threads from the other series.note 
    • The Tales of Bauchelain and Korbal Broach: Erikson. A series of largely satirical novellas chronicling the misadventures of a pair of eccentric, homicidal necromancers and their put-upon manservant.note 
    • The Kharkanas Trilogy: Erikson. A Prequel in the Lost Age trilogy primarily dealing with the Tiste and the civil war that led them to become sundered into the Tiste Andii, Tiste Edur and Tiste Liosan peoples and led them to invading the main world of the series. note 
    • The Path to Ascendancy: Esslemont. Prequel trilogy chronicling the early adventures of Kellanved and Dancer and how they would eventually come to found the Malazan Empire. note 
  • The '80s Magic in Ithkar anthologies were more of a shared setting; all the stories started with the setting of Ithkar Fair, detailed in the anthology prologues, but other than that each author's stories were free-standing, sharing no characters, events, or settings beyond those established in the prologues. Most notably, one story ended with the Fair being shut down due to plague; this was not reflected in any of the others.
  • The Spore Wiki Fiction Universe began life as a Spore fan fiction continuity but eventually separated itself. It's shared between multiple writers and is open to anyone willing to write for it.
  • Galactic Crucibles, which also originated as Spore fan fiction, is a shared Space Opera universe between numerous authors with a large focus on worldbuilding. Interestingly enough, it is implied to be part of the same multiverse as the Spore Wiki Fiction Universe.
  • As well as the The Infernal Devices prequel series, The Mortal Instruments is said to be set in the same universe as the Modern Faerie Tales by Holly Black. Val and Luis from Valiant are the homeless kids Clary sees in the first book and Simon listens to Stepping Razor, Ellen's band from Tithe.
  • The Ur-Example of a Shared Universe book is The Bible, although it is chiefly notable as an object lesson in the importance of having an editor.
  • Rick Riordan's various mythology series The Camp Half-Blood Series (actually three different series), The Kane Chronicles, and Magnus Chase and the Gods of Asgard all take place within the same universe. The Kane Chronicles contains several hints towards this end, culminating in a crossover. Magnus Chase is actually Annabeth Chase's cousin. This usually doesn't affect the series much, as by-and-large the various gods and mythologies avoid interaction in a sort of deliberate Mutual Masquerade, but later books tend more and more towards inter-connectivity, with characters from one series showing up in another.
    • This is currently set to be averted with the 'Rick Riordan Presents' series of books, which while edited by Riordan and using similar themes will not be explicitly in the same universe, at least at the start.
  • Philip Jose Farmer's "Doc Savage" books have a number of other writers' fictional characters exist in the same continuum, using the device of a comet that struck a group of people leaving a party, resulting in their offspring becoming many famous characters from fiction. Since many of these creations were still covered by copyright at the time, one wonders how he got away with it!
  • As mentioned below in Multiple Media, the Dungeons & Dragons setting Forgotten Realms is notable for having over 70 novel series all set in the same world with minimal Continuity Snarl. The Other Wiki has a page
  • Stephen King is fairly notorious for this amongst fans of his work, with nearly all of his novels containing either major or minor references to each other and sharing the overall connection of The Dark Tower series. It's recently further expanded to include references to the works of his son Joe Hill.
  • Isaacs Universe is a shared setting created by Isaac Asimov in the 1990s, totaling five books. Three volumes were anthologies of short stories edited by Martin H. Greenberg (contributing authors included Poul Anderson, David Brin, Hal Clement, George Alec Effinger, Karen Haber, Janet Kagan, Rebecca Ore, Robert Sheckley, Robert Silverberg, Allen Steele, Harry Turtledove, and Lawrence Watt-Evans). The novels Fossil by Hal Clement and Murder At The Galactic Writers Society by Janet Asimov are also set in the same setting.
  • Every "Bret Easton Ellis" book share the same cast of characters and even places in the same world, even old characters making appears in later books, like for example in "The Rules of Attraction" on of the main characters is Sean Bateman, his brother "Patrick Bateman" had a chapter in the book and later became the main character in "American Psycho", even Sean had a minor appear. Also is indicated that "Story of My Life" by Ellis friend's "Jay McInerney" also is set in this world for the appear of the protagonist "Alison Poole" and she even is a main character in "Glamorama" as Victor's girlfriend.
  • The short story "Time and Time Again" by H. Beam Piper, in which the 43-year-old Allan Hartley's mind is sent back in time to his 13-year-old self's body in 1945, is set in the same universe as two later Piper works, "The Mercenaries" and "Day of the Moron". Both stories, which take place in 1965 and 1968 respectively, refer to President Blake Hartley, indicating that Allan's plan to get his father elected in 1960 was successful and an Alternate Timeline was created. In "Time and Time Again", Allan planned to raise capital for his father's campaigns by using his knowledge of future developments in chemistry to establish a company that will overshadow IG Farben. "The Mercenaries" reveals that Blake served as the President of the chemical company Associated Enterprises before his election but the real power lay with Allan. Kato Sugihara speculates that the same is true with respect to the government.
  • "He Walked Around the Horses" by H. Beam Piper, in which Benjamin Bathurst slipped into an Alternate Universe in which the American and French Revolutions never happened, is set in the same universe (or rather multiverse) as Piper's Paratime series. The first official Paratime story "Police Operation" features an implicit reference to the events of "He Walked Around the Horses", describing the situation but not mentioning Bathurst by name. In that story, Tortha Karf says, "I picked up a fellow on the Fourth Level, just about where you're operating, and dragged him a couple of hundred parayears. I went back to find him and return him to his own time-line, but before I could locate him, he'd been arrested by the local authorities as a suspicious character, and got himself shot trying to escape. I felt badly about that."
  • "Fear Street" by R. L. Stine is an anthology of 100+ standalone novels - barring the occasional sequel or trilogy - that nonetheless all take place in the same town, allowing characters and locations will recur over multiple books. Some of the most fully realized characters never starred in their own book, but had minor appearances in enough books to make up for it.

    Live-Action TV 

    Multiple Media 

    Radio 

    Tabletop Games 
  • Warhammer Fantasy and Warhammer 40,000 was long rumored to exist within the same universe and galaxy; Fantasy's planet being a single planet existing outside the scope of the galactic warfare of the wider galaxy of the 40k setting. A common theory was that Sigmar, founder of the Empire in Warhammer Fantasy and somewhat of a demigod was a Primarch, one of the God-Emperor of Mankind's genetic sons who was somehow lost on the planet.
    • This was later subverted in the End Times campaign of Warhammer Fantasy, in which a group of heroes venture into the Realm of Chaos and encounter a "silvery knight speaking a strange accent", hinted as being Grand Master Kaldor Draigo, a Space Marine lost on the Warp in the 40k setting. This confirmed the longstanding theory that, while the two settings weren't set in the same world, it was connected by the same immaterial plane of Chaos called the Warp.
      • Turns out it is a Relictor Stormcast Eternal from Age of Sigmar, the sequel to Warhammer Fantasy. The Warp does mess with time after all
  • Twilight: 2000 and 2300 AD both share the same historical background, with World War III taking place in the late '90s. Twilight: 2000 is in the immediate aftermath, and 2300 AD says what happened during the next 300 years of human history. Although it would be fun to contemplate a group of grizzled WWIII veterans encountering the Kafer from 2300, there weren't any crossovers in the printed adventures, and the two systems had incompatible game mechanics.
  • Earthdawn and Shadowrun, both by FASA, are also set in the same universe. Earthdawn is said to be the Fourth World, while Shadowrun is the Sixth, several thousand years later. There are shared characters between the two games, including several dragons and a few immortal elves. Shadowrun has been hinting for some time in its Meta Plot that the Horrors, the primary adversaries in Earthdawn, will soon return to destroy the world. The ties were much stronger when FASA was producing both games, and were downplayed after FASA folded.

    Toys 
  • Hasbro toylines:
    • The bio for the C.O.P.S. character Checkpoint established that his father was a member of an US Army special force unit active throughout the 80's and gave him the name "Wayne R. Sneeden III", the same name as G.I. Joe's Beachhead. The toy bios for COPS were written by Larry Hama, who also wrote most of the character profiles and Marvel comic book issues of G.I. Joe A Real American Hero.
    • The GI Joe 25th Anniversary toyline featured a figure named "Specialist Trakker" whose bio established MASK and VENOM as divisions of GI Joe and Cobra. This is a case of Retroactive Continuity as MASK was made when Kenner was still a competitor to Hasbro and thus was obviously not made with the idea of slotting it in the GI Joe universe.

    Video Games 
  • Grand Theft Auto and Manhunt (both developed by Rockstar Games) take place within the same universe, as confirmed by overlapping references like place names, vehicles and fictional brands. Rockstar's Bully is also a possibility though there are not enough references that verify this. Although the HD series exists in a different universe than the Trilogy, both Carcer City and the Bullworth Academy were referenced in GTAV. GTAV also mentioned Jack Marston's memoirs as an in-universe history book, meaning the Red Dead series (or at least Red Dead Redemption) is set in the universe as well.
  • Half-Life, Portal, and Counter-Strike (or at least the GoldSrc games) share a universe. Portal includes references to Black Mesa and the Combine throughout the first and second games, while Counter-Strike shares a lot of assets with the first Half-Life (including Black Mesa branded containers, scientists, and cars) in both the original game and the Condition Zero standalone expansion pack on part of originally being a mod. Condition Zero throws in a few pieces of Black Mesa's fictional tech in its single player levels, such as their auto-turrets and M23B laser mines. There's also the fact that CS was originally bundled with HL in retail (the original came with the first game, and the Source remake was bundled with the second) and originally titled Half-Life: Counter-Strike, while Portal was bundled with Half-Life 2's episodic expansions as part of the Orange Box (Portal 2 was sold standalone).
    • Team Fortress Classic, another game derived from a Half-Life mod, was heavily implied to be in this universe for much the same reasons as Counter-Strike (though a slightly weaker case since it never carried the Half-Life brand, despite being bundled with it in some packs and sporting the lambda logo on its box art). The "Hunted" map, for instance, is the Black Mesa facility. This was going to be made explicitly canon with an expansion pack at one point, but the project was canceled 60% of the way through. In 2016, Team Fortress Classic was folded into the Team Fortress 2 universe instead, via comic.
  • Suda51's No More Heroes, Killer Is Dead, killer7, Lollipop Chainsaw and The Silver Case officially share the same universe. The connection is made during several scenes in Travis Strikes Again; such as the introduction featuring Dan Smith telling Bad-Man where to find Travis, Kamui Umehara assisting Travis in locating the Death Balls, Travis meeting Mondo on a hunt for Dracula. A scene in The Silver Case: 25th Ward has someone describe a "Mr. TD" riding a motorcycle with a talking cat looking for a sphere. For extra content, Shadows of the Damned is also a popular game in-verse.
  • Cing's adventure games Another Code and Hotel Dusk: Room 215 (and their respective sequels) take place in the same universe, but are otherwise unrelated.
  • The Super Mario Bros. and Donkey Kong series exist in the same universe, by virtue of sharing a common first game. Additionally, due to first appearing in Super Mario World and Super Mario Land 2: 6 Golden Coins respectively, the Yoshi's Island, Wario Land, and WarioWare series are also part of the expanded Super Mario universe, though in a very loose technicality for the latter two, as unlike the Yoshi and Donkey Kong universes which have a great presence in Mario games & spinoffs, the Wario universes have minimal to no presence in the Mario series outside of Wario himself.
    • When Rare was still developing games for Nintendo, Diddy Kong Racing meant that Banjo-Kazooie and Conker's Bad Fur Day were also (very tenuously) connected, but it's no longer the case since Rare was sold to Microsoft.
    • The WarioWare and Rhythm Heaven series are heavily hinted to exist in the same universe: Orbulon's minions, the Space Bunnies, appear in the original Rhythm Tengoku, a unnamed character very similar to Young Cricket is playable in a minigame in Rhythm Heaven Fever, and Rhythm Heaven Megamix features two unlockable sets starring the Warioware cast. In turn, Game & Wario feature multiple background appearances by Rhythm Heaven characters throughout its cutscenes.
    • Many other Nintendo games have references to each other that imply they share a universe. There are many examples of minor enemies from one game series having appearances in other games, although often with the names changed. For example, The Legend of Zelda: Link's Awakening has several enemies from the Mario games though that particular title has the justification that it takes place in a dream world. Although several other Nintendo games have the other games existing as games in their universe. For most games the degree to which they are connected is left unclear.
  • Street Fighter, Final Fight, Saturday Night Slam Masters, Captain Commando and Rival Schools 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, the portable versions of Alpha 3 features Maki from Final Fight 2 as an extra character (based upon her Capcom vs. SNK 2 incarnation), and Cammy is a secret challenger at the Fight Club in (the non-canon) Final Fight Streetwise. (It's also believed by several fans that The Ghost, another pit fighter, is Joe due to their similar appearances and fighting styles.) Hugo and Rolento later returned in Ultra Street Fighter IV with Poison as a newcomer (all three being ported from Street Fighter X Tekken). Even more recently did Abigail, the boss of the original game's Bay Area, show up as a playable character in Street Fighter V, much to the surprise of many.
    • 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. Supplemental materials in the SFV era also state that Yoko Harmageddon, Rainbow Mika's mentor and trainer, was forced to retire after sustaining a Career-Ending Injury in the ring against Black Widow.
    • 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.
    • In Rival Schools, Sakura has a cameo in the first game as an unlockable Guest Fighter while Hinata and Tiffany make background appearances in Street Fighter V. In addition it's implied that Ran may be related to Dan, both sharing the last name of Hibiki.
    • Season 2 of expands the reach of the Street Fighter universe in a different direction with its inclusion of Zeku, Guy's master and the preceding grandmaster of the Bushin style. His design and moveset contain numerous allusions to Strider Hiryu, "Original Strider" is an unlockable title of his, and he even name drops the Strider organization in his story, all of which suggest Zeku founded the Striders or was otherwise heavily involved with the organization's inception.
    • There's also Akuma's appearance in Tekken 7. See below for more details.
  • You think Capcom's Ace Attorney universe is crazy? HA. You have no idea.
  • The Dead or Alive and Ninja Gaiden series both take place in the same universe (owing to being developed by Tecmo/Team Ninja), complete with having characters originating in one becoming plot-integral in the other. Most notably (see the entry in Canon Welding for more examples), Ryu first crossed over to DOA and canonically won the second tournament, followed by Ayane playing a supporting role in the second Ninja Gaiden trilogy, with Kasumi making brief cameo appearances in Sigma 2 before becoming a playable character herself in 3: Razor's Edge. Of course, characters will change looks to match the art style of the respective games. Fellow Tecmo IP Fatal Frame is also in this shared universe due to Ayane's side story in Fatal Frame 5, and Nioh turns out to be a prequel to Ninja Gaiden, as an ancestor of Ryu named Jin Hayabusa appears.
  • While Koei's Warriors Orochi was made to confirm that its series Dynasty Warriors and Samurai Warriors take place in the same universe, the second trailer of Warriors Orochi 3 more or less confirms that Koei's other games (Warriors: Legends Of Troy and Bladestorm The Hundred Years War) also are part of this setting due to the presence of Achilles and Jeanne D'Arc. It also confirms that its business partner Tecmo's series Ninja Gaiden and Dead or Alive (see directly above) take place there due to the presence of Ryu Hayabusa, Ayane, Momiji and later Kasumi. Naotora Ii would later cross over to DOA, making an appearance in Dead or Alive 5 Last Round.
  • The Ultima series features references to the Wing Commander series. In Ultima I there were spaceships that in Ultima VII: The Black Gate was explained to be the spaceship of the Kilrathi. As pointed out by Spoony here.
    • Origin seemed to be trying to establish this in all of their mid-90s games- in addition to the connections between Wing Commander and Ultima, the manual for Wing Commander Arena has, among other things, an advertisement for a No Remorse movie.
  • 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").
    • Additionally, Pookas often show up in Pac-Man titles, hinting that they might possibly share a universe, although considering the number of elements that overlap in Namco games in general (the Special Flag from Rally-X showing up in several other games for instance), this might not be the case.
    • The United Galactic Space Force links thirty games into the same universe, known as the UGSF Series.
  • EVE Online and the FPS DUST 514 are part of the same universe... literally. Players can accept contracts and do missions for the player-run companies of EVE Online, and even form their own corporations that EVE Online players are able to join.
  • The Science Adventure Series consisting of Chaos;Head, Steins;Gate, Robotics;Notes, and Chaos;Child occur in the same universe. These stories take place several years apart from each other, though there are several scenes in each that make references to the others.
  • The presence of both Seath the Scaleless and Patches the Hyena (as well as some other recurring characters and elements) seem to indicate that Dark Souls shares the same world and universe as the King's Field series and Demon's Souls. With Patches returning as Patches the Spider, as well as the presence of the Moonlight Greatsword, Bloodborne seems to be connected as well. Likely the only reason the connection between Demon's Souls, Bloodborne and Dark Souls wasn't made explicit is because the former two IPs technically belong to Sony, not FROM.
  • Brøderbund 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. Then, Lode Runner is revealed to be connected to Bomberman by the ending of the NES version of the latter.
  • 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.
  • Marathon takes place in the same universe as Pathways into Darkness, and possibly Halo. There is even a terminal in the first Marathon game (which is a historical record) that talks about the events of Pathways.
  • The entire premise of the Reality-On-The-Norm project. It is a shared universe set around the eponymous City of Adventure.
  • The Tom Clancy series games (Splinter Cell, Ghost Recon, and H.A.W.X.) share a single universe, and often have crossover cameos with each other.
    • This is particular apparent between the Ghost Recon and H.A.W.X. games - multiple missions in the latter have the player supporting Ghost teams, and (plot inconsistencies aside due to them coming out two years apart) Future Soldier depicts the same conflict as in H.A.W.X. 2. There's also Ghost Recon 2's plot kicking off from the sinking of the USS Clarence E. Walsh, an event depicted about halfway through Splinter Cell: Chaos Theory, and both Future Soldier and H.A.W.X. 2 mention Voron, the Russian equivalent of Third Echelon from Conviction.
    • Rainbow Six, the original Tom Clancy game, may also be part of the shared universe - Vegas 2 has one mission in which you receive support from an "NSA Agent" who dresses very similarly to Sam Fisher.
  • This easter egg from Assassin's Creed IV: Black Flag heavily suggests that Assassin's Creed, Far Cry and Watch_Dogs share a universe. Considering that ACIV's MacGuffin would be of tremendous use in Watch_Dogs, this is unsurprising.
    • Oliver Garneau from Black Flag's Frame Narrative leaves for Chicago (where Watch_Dogs is set) during the game. In Watch_Dogs, Aiden kills him as part of an optional side mission under mysterious orders from "The Brotherhood." There are also several references to Abstergo Industries, and, at one point, a child can be found playing Assassin's Creed III: Liberation, which is a video game produced by Abstergo Entertainment in-universe.
    • One mission in Far Cry 3, which discusses "strange scientists" and "genetic memories", takes you to an abandoned Abstergo laboratory, placing this game and Far Cry 4 in the same universe as Assassin's Creed and Watch Dogs. This extends to Far Cry 2 which is definitely set in the same universe as 3 and 4, due to them sharing characters and references, but whether the original or the fifth entry are still in the universe is yet to be seen. The world goes through a nuclear apocalypse at the end of 5, that is expanded upon in Far Cry: New Dawn; if that doesn't happen in the mainline Far Cry, Watch Dog, and Assassin's Creed franchises then it seems that 5 branched off into an Alternate Continuity.
      • The console-only remake of the first game, Far Cry: Instincts, deviates from the PC-only original in several ways, in both gameplay and continuity. It was followed by two (also console-only) sequels, Far Cry Instincts: Evolution and Far Cry Instincts: Predator. The Insticts sub-series somewhat ties itself to Far Cry 2, as it has Jack Carver acting as an arms dealer, increasing the evidence for the theory that he is in fact the Jackal from Far Cry 2 (see also: the Jackal and Instincts!Jack both being former U.S. Army, while OG!Jack was former U.S. Navy). Due to Crytek leaving after the first game and not being present for the sequels or console ports, a common fan theory is that Far Cry is in the same universe as Crysis while Far Cry: Instincts in a different timeline acts as the start of Ubisoft's Far Cry/Watch Dogs/Assassin's Creed universe.
    • Rayman and Far Cry 3: Blood Dragon are also video games in-universe, presumably by Abstergo Entertainment.
  • Mega Man (Classic), X, Zero, ZX, and Legends, all on the same timeline despite the tone reaching further and further away from the original series with each new series.
  • According to a 1982 issue of Electronic Games magazine, Robotron: 2084 takes place in the same universe as Defender and Stargate (aka Defender II). The hardly released Blaster is a sequel to Robotron.
  • Harvest Moon has a vague continuity, not helped by the amount of reusing the same characters. It has been proven that some games share a universe though:
  • Downfall and The Cat Lady share a universe. The 2016 remake of Downfall make this even more obvious, having The Cat Lady herself, Susan Ashworth, show up at the end. This indicates that Downfall takes place sometime after the events in The Cat Lady.
  • Although it's a crossover game, Namco × Capcom is a special case. The game itself has a world with the settings and characters of several contemporary Namco (Tekken, Wonder Momo, .hack, etc.), Capcom (Street Fighter, Resident Evil, Dead Rising, etc.), and as Project X Zone shows up, even Sega (Fighting Vipers, Dynamite Cop, etc.) properties co-existing, and implies that Xenosaga is its future. Crossover shenanigans involve other universes, then the main characters from the game (and Xenosaga) appeared in the Endless Frontier games, which is a side realm of the Super Robot Wars Original Generation universe. This came back when characters from the Frontier and OG universes appeared in Project X Zone, then went back to Super Robot Wars OG: The Moon Dwellers discussing their appearance in the previous game.
  • BioShock, which has ties to Gone Home, with one of the SNES game cartridges you can find in Sam's room being Super Spitfire, which references a minigame called Spitfire in BioShock 2: Minerva's Den, which the developers of Gone Home previously worked on, and from there to Firewatch, with one of the novels you can find in the caches being a copy of The Accidental Savior, the novel written by the protagonist's father in Gone Home. Also implied by this interview with Fullbright co-founder Steve Gaynor.
    Steve Gaynor has previously stated that the developer "very lightly implies" that Gone Home takes place in the same reality as BioShock. Gaynor's team has also inserted a small reference to Firewatch into the console version of its game.
  • Through Canon Welding, and Akuma's Guest Fighter status, it's suggested that Tekken and Street Fighter are set in the same universe (or, at the very least, a version of Street Fighter exists in the Tekken universe). Likewise, with Geese Howard making an appearance as DLC, Fatal Fury and The King of Fighters can be lumped in there as well.
  • Several of SNK's properties are set in the same universe, if The King of Fighters is of any indication. The King of Fighters XIV backtracks slightly with its Another World Team (consisting of Samurai Shodown's Nakoruru accompanied by Mui Mui and Love Heart, respectively from the pachinko games Dragon Gal and Sky Love, all drawn into the KOF world because of a rift between dimensions), suggesting that the various SNK titles that may or may not fit neatly into the KOF continuity (itself already an Alternate Continuity of the joint Art of Fighting/Fatal Fury timeline by virtue of Geese Howard being Killed Off for Real in 1995's Real Bout Fatal Fury but sporadically appearing in KOF alive and well starting the following year) exist as part of a greater multiverse.
  • The connections between Saints Row and Volition's other Flagship Franchise, Red Faction, have waned and strengthened throughout the years, primarily revolving around the villainous Mega-Corp named Ultor, which is the driving force behind the colonization of Mars in RF. As early as the original Saints Row, the city of Stilwater hosted the Ultor Dome, featuring the Ultor corporate logos, and Ultor became a major power in the city by Saints Row 2. Although it had merged with the 3rd Street Saints by Saints Row: The Third, weakening the connection (because there is no mention of the Saints in RF), one of that game's two endings reinforced it again by having the main characters star in a movie about Mars, meaning that SR!Ultor does have some interest in the Red Planet. And then it went right out of the window when the entire planet of Earth was blown up by the invading aliens in Saints Row IV (it is very much intact in RF). However, the shared universe, or rather, shared multiverse was reestablished by Saints Row: Gat Out of Hell and Agents of Mayhem, as the former had an ending that erased the Saints' entire timeline via Cosmic Retcon, and the latter established it as canon. AoM contains no references to Ultor, but it presumably never gets bogged down in Stilwater in this timeline and eventually reaches Mars.
  • Easter eggs suggest that Dragon Age is a video game franchise in the universe of Mass Effect. Evidence for this include the Blood Dragon Armor in Mass Effect 3 being modeled after a suit from Dragon Age (complete with the series logo on the chest) and a statue of a Dragon Age ogre being seen in Donovan Hock's vault.
  • Hitman and Kane & Lynch. The titular duo from the latter makes a cameo appearance in Hitman: Absolution, after being seen on newspapers in Hitman: Blood Money. You can kill them.
  • Star Fox and F-Zero have quite a few references to each other within their universes, to the point where it's speculated that they are in the same universe or two closely connected universes. In the case of F-Zero, the F-Zero machines all have a G-Diffuser, same as the Arwings. Then there's James McCloud from F-Zero who looks like James McCloud from Star Fox transformed into a human, attire and all (including James' shades), his Little Wyvern resembles an Arwing and the development company of the Wyvern, Space Dynamics, was the company of Slippy's father. Although it was claimed in Super Smash Bros. for Nintendo 3DS and Wii U that they are not the same character, this may or may not be true. In the case of Star Fox, one of the endings in Command has Fox and Falco turning their Arwings into racing machines for the G-Zero Grand Prix and one of the bosses in the game is Octoman, a playable character in the F-Zero series since X.
  • The Soul Series takes place in the distant past of the Tekken series. The links between the two have been minimal (the most critical one being the presence of a man named "Yoshimitsu" leading a group of ninjas called the "Manji" in both, the one in Soulcalibur being the 16th century ancestor of the one who comes from Tekken) but exist in the same reality.
  • Some of Wadjet Eye Games creations are confirmed to be set in a shared universe.
  • The Infocom Zork text adventures are set in the same universe as the Enchanter trilogy (Enchanter, Sorcerrer, Spellbreaker). The Enchanter Trilogy has fewer Zorkisms, but if you enter a pitch black place, you are still likely to be eaten by a Grue if you don't turn on a light source. The game Starcross also has the Grue reference in both the story and the stock warning about entering a dark place. Starcross is a futuristic Science Fiction game that is played straight and its inclusion in the Zorkian universe is incongruous, despite the fact that a grue is seen in the space zoo. Game reviewers such as Digital Antiquarian have theorized that this might be due to laziness on the programmer's part as they could have simply changed the code to remove the "grue" reference or change the light source limitation.

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Alternative Title(s): Shared World

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