"So many heroes from so many dimensions! This is pretty cool!"A crossover that involves characters from more than two works of ficton. More often than not, this is a mash up of series which do not have a strict sense of continuity or a clear Universe Bible. To lessen canon-faulting, especially with series that do have strict continuity, a new 'neutral' setting is made that offers equal footing for all the characters. It also becomes more viable the farther you get from canon, such as one-time TV specials and especially video games. As Story Arcs have become more prevalent, this practice has somewhat lessened, with shifts to strict Verse building and explicit references. This rarely occurs in live action shows, unless a production company can be formed that holds copyrights to everything. Thus, this is much more common in animated works — although you can generally expect The BBC to pull one out of somewhere when Children in Need or Comic Relief rolls around. This trope has become increasingly common in video games, especially those involving both licensed and original properties. These games, depending on how far or how deep they mine, can have interesting effects on the fiction chosen. Many long-gone and/or forgotten Humongous Mecha shows, for example, often get a new lease on life, or even a brand-new sequel or remake, after making an appearance or two in a Super Robot Wars game. Similarly, the Fire Emblem series was finally brought over to the US to great success after two of its characters made an appearance as unlockable fighters in Super Smash Bros. Melee. The name is a pun on the video game genre of "massive(ly) multiplayer online game". This trope is Older Than Feudalism. The Argonautica by Apollonius Rhodius (3rd century BCE) features nearly every ancient Greek mythical hero all going on a quest to find the Golden Fleece. Sub Tropes:
- Crisis Crossover (a company-wide Massive Multiplayer Crossover)
- Cross Through (a company-wide event that affects every series involved without having them cross over)
- Deconstruction Crossover (when the main purpose of using a Massive Multiplayer Crossover is Deconstruction)
- Monster Mash (classical movie monsters)
- Ultimate Showdown of Ultimate Destiny (When the Massive Multiplayer Crossover meets Let's You and Him Fight)
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- The Big Finish Doctor Who "Sixth Doctor and Jamie" series, which is set entirely in the Land of Fiction:
- Night's Black Agents is a Scottish Gothic fest, featuring Merodach from "The Brownie of the Black Haggs" by James Hogg, Lucy Ashton from The Bride of Lammermoor by Sir Walter Scott and Thrawn Janet from the Robert Louis Stevenson story of the same name.
- Legend of the Cybermen features the Artful Dodger, Little Lord Fauntleroy, Alice Liddel, Dracula,Long John Silver and Captain Nemo.
- A MasterCard commercial featured several food mascots (from Count Chocula to the Pillsbury Doughboy) eating dinner — with Mr. Clean doing the dishes.
- USA Network's commercials play this for laughs, having various combinations of characters from their shows (Burn Notice, Monk, Psych, others) encounter each other and make idle conversation.
- UK example: The Greatest Minds In Advertising Join Forces in a 2009 viral for Comic Relief.
- The Met Life insurance company has released an ad featuring characters from "Peanuts," "Looney Tunes," Hanna-Barbera, and many other animation studios.
- An advertising campaign for Krystal has a red-haired girl, a clown, and a guy in a creepy mask passing up their respective restaurants to get some food from Krystal.
- The Origin promo for Toonami Asia seems to imply this, as we're shown characters from Justice League Unlimited, Ben 10, and Generator Rex all existing in the same universe, before the end of the Age of Superheroes happened.
- Aardman Animations made a Google+ Hangout commercial for Christmas 2012 that featured Wallace & Gromit making a conference call with Ginger, Captain Cuddlepuss and Trixie, the robins, Shaun's flock, and Piella and Fluffles.
Anime & Manga
- The Giant Robo OVA series featured characters taken from several other series Misuteru Yokoyama — the original creator of Giant Robo/Johnny Sokko and His Flying Robot — had written. This included adaptations Romance of the Three Kingdoms and The Water Margins, which led to many main and secondary characters in ancient Chinese clothing coexisting with people in three-piece suits 20 Minutes into the Future. It also included the very first Magical Girl, Mahotsukai Sally (Sally, the Witch), under her original name "Sunny", as Shockwave Alberto's daughter.
- Legendary Manga creator Osamu Tezuka similarly uses Reused Character Designs in his "Star System", wherein a character from a previous work will actually play a different role in another story, as if they were an actor or actress.
- DragonFall◊ blended Dragon Ball, Star Wars and a whole bunch of other series into a parody. With mixed results.
- The intro to the Rumiko Takahashi gallery show It's a Rumic World explicitly crosses over Ranma ˝, Urusei Yatsura, and InuYasha.
- Tsubasa Reservoir Chronicle has the characters jumping from Alternate Universe to Alternate Universe filled with CLAMP characters from their various series. Amusingly, save a select few examples, mostly as cameos, the Alternate Universes are hardly ever populated by actual CLAMP characters, but Alternate Universe instances of them. Their first crossover happened in Clamp Campus Detectives since the three main character were in series/stories on their own before CCD: Nokoru Imonoyama in Duklyon, Akira Ijuin in 20 Mask ni Onegai (Man of Twenty Masks) and supposedly Suou Takamura showed up in an old oneshot. Then there was X/1999 where characters from past CLAMP series started appearing, including Subaru, the main character of Tokyo Babylon, as a major character, and during his series set in the early 90s it was said that he would have a role in The End of the World as We Know It that is X, making for a bit of foreshadowing.
- Shattered Angels is primarily a crossover of the mangaka and studio's previous works: Kannazuki no Miko, Steel Angel Kurumi, Magical Nyan Nyan Taruto, and UFO Princess Valkyrie.
- Before Dengeki Gakuen RPG: Cross of Venus (mentioned below), there was this animated short produced for Dengeki Bunko's 2007 Movie Festival, featuring chibi versions of characters from Kino's Journey, Inukami! and Shakugan no Shana (Note that the chibi Shana here is not Shana-tan; for one, she is the stalker rather than said omake series' Kazumi.).
- While most Go Nagai series contain cameos here and there, Shin Mazinger goes the whole way. Characters from several alternate versions of Mazinger Z show up, as well as characters from Violence Jack (itself a Deconstruction Crossover) and the title demon from Mao Dante. Unsurprisingly, this series is being directed by the same man behind Giant Robo, Yasuhiro Imagawa.
- CB Chara Go Nagai World is a crossover which features SD versions of Mazinger Z, Devilman, and Violence Jack, with in-story explanations for the characters being SD, and with plenty cameos (such like UFO Robo Grendizer, Kotetsu Jeeg and Getter Robo).
- Go Nagai has been doing this for a loooong while. Back in the seventies several movies were made by Toei crossing Mazinger Z with Devilman, Great Mazinger with Getter Robo and Getter Robo G or UFO Robo Grendizer, or several of them together.
- Super Robot Retsuden, with story and art by Ken Ishikawa, is an Affectionate Parody of those movies. Mazinger Z, Great Mazinger, UFO Robo Grendizer, Getter Robo and Kotetsu Jeeg characters join their forces to face an Eldritch Abomination.
- And the Dynamic Heroes e-manga is a Crossover featuring Mazinger Z, Great Mazinger, UFO Robo Grendizer, Getter Robo, Getter Robo G, Devilman AND Cutey Honey.
- The Pretty Cure All Stars movie series allows the Cures from the past seasons to meet (and be friends with) the new team.
- About a week after the debut of the film Dragon Ball Z: Battle of Gods, Goku and his friends turned up in the latest annual One Piece and Toriko crossover episode.
- Kazuma Kamachi wrote a light novel that crosses over all his works called The Circumstances Leading to a Certain Magical Heavy Zashiki Warashis Simple Killer Princess's Marriage.
- In The Snow Queen (2005), a lot of references and adaptations of Hans Christian Andersen are included.
- Yatterman Night takes place in a continuity where various characters created by Tatsunoko Production (or at least approximations of them) exist in a shared universe. Even the Mach 5 appears!
- Robot Girls Z combines this with Moe Anthropomorphism by having Mecha Musume versions of Toei's super robots. The leads are girl versions of Mazinger Z, Grendizer, and Great Mazinger, with supporting casts from Getter Robo and Steel Jeeg. The second season then proceeds to add robots from Getter Robo and Gai-king. The show itself is a Slice of Life comedy with the wacky antics of both the Robot Girls Z and their rivals (Robot Girl versions of Doctor Hell's minions).
- Starting with episode 7, the cast of Space Patrol Luluco travels around the universe visiting planets based on other Studio Trigger works Kingdom Hearts style.
- There's a Star Trek-related comedy routine in which Mr. Spock, HAL 9000, and Obi-Wan Kenobi all appear on Jeopardy, in a mental variant of an Ultimate Showdown of Ultimate Destiny. Kenobi is declared the winner, but only because he uses the Jedi Mind Trick on Alex Trebek.
- Stand-up comedy troupes sometimes feature a series of comedians who usually headline their own shows:
- The Original Kings of Comedy
- The Blue Collar Comedy Tour
- The Comedians of Comedy
- The League of Extraordinary Gentlemen has a Super Hero team composed of multiple public domain characters.
- Crisis on Infinite Earths was a massive DC multiverse crossover that attempted to pare down the 837,000 alternate Earths (some populated by the superheroes DC Comics had acquired by buying out other comic book companies over the course of 50 years, others created just to resolve DC's own legendary Continuity Snarls) into one world, obliterating many "Alternate Earth" characters in the process.
- Fables is about various figures from fairy tales and folklore living secretly in a neighborhood in NYC.
- Castle Waiting is another multiplayer fairy tale crossover, featuring characters from many different tales living together in a castle.
- Planetary is about an investigative super-team in the WildStorm universe. Their members have had run-ins with Dracula, Sherlock Holmes, Jenny Sparks from The Authority and multiple versions of Batman.
- The Indelible Alison Bechdel offered a mash-up of various lesbian and gay comic artists, who threw their characters into the same world for a party. As the mash-up included Diane DiMassa, creator of Hothead Paisan: Homicidal Lesbian Terrorist, the results were hilarious.
- Joe the Barbarian does this in a manner similar to The Indian In the Cupboard.
- A non-canon Judge Dredd story in the 1980 Dan Dare annual had Tharg bring all the popular characters currently being published in 2000 AD as well as the Starlord to Dredd's apartment for a surprise party. Then the robots that actually write the comics went on strike, forcing the characters to beat them all up.
- The Alan Moore comic Albion shoves together a whole bunch of British comic characters of varying obsurity, most of whom are imprisoned by the Government as part of The Masquerade.
- Shi/Cyblade: The Battle for Independents featured many independent comic book characters, including Cerebus, Bone, Hellboy, Madman, Megaton Man, Scud the Disposable Assassin, The Tick and Usagi Yojimbo. Many of the same characters have also appeared in the normalman/Megaton Man special, Genšł ABC and War of the Independents.
- Freddy vs. Jason vs. Ash, and its sequel Freddy vs. Jason vs. Ash: The Nightmare Warriors.
- Dark Horse Comics had Alien versus Predator versus Terminator, Superman and Batman versus Aliens and Predator, and two miniseries that crossed over Witchblade, Aliens, The Darkness and Predator.
- Fantastic Four: True Story has the FF traveling to the realm of fiction, that is attacked by Nightmare, lord of the dreamworld. To fight him they join forces with Dante Alighieri, the Dashwood sisters, Faust, almost all William Shakespeare's protagonists, Frankenstein's Monster, Robin Hood, the Ivanhoe cast and others, while Nightmare gains allies in the Sheriff of Nottingham, Dracula and Long John Silver. Many other characters like Tarzan make cameos and in the end Johnny summons lawyer friendly versions of James Bond, Megatron, Steven Seagal and Chuck Norris to defeat Nightmare's army.
- Legenderry: A Steampunk Adventure is an Elseworld to various Dynamite Comics universes, in which Red Sonja, The Green Hornet, The Phantom, Vampirella, Captain Victory, Silver Star, The Six Million Dollar Man, Zorro and Flash Gordon all exist in the same world. Which is Steampunk.
- The subsequent spin-offs add more crossovers: Legenderry: Green Hornet reveals the Legenderry world has an equivalent of the Land of Oz; Legenderry: Red Sonja has her team up with the Bride of Frankenstein and also features Captain Nemo; and Legenderry: Vampirella has Rupert of Hentzau and Dr Moreau.
- Pathfinder: Worldscape is another crossover brought by Dynamite Entertainment featuring Pathfinder adventures, alongside Tarzan, John Carter of Mars, Red Sonja and Fantomah, where they are plucked from their respective dimensions and forced to fight against each other and other creatures in the world of Worldscape.
- The Totally Stonking, Surprisingly Educational and Utterly Mindboggling Comic Relief Comic (1991) featured (amongst others) the presenters of Comic Relief, Judge Dredd, Dan Dare, Desperate Dan, Dennis the Menace (UK), Roger Melly, Batman, Superman, Wonder Woman, The Incredible Hulk, Spider-Man, Silver Surfer, the Teenage Mutant Ninja Turtles, all seven (then) Doctors, RoboCop, Cookie Monster, and Sir Edmund Blackadder. Sadly but unsurprisingly, copyright issues mean it can never, ever be reprinted.
- Sonic the Hedgehog/Mega Man: Worlds Collide is a crossover between Sonic the Hedgehog and Mega Man. It was followed by a sequel, Sonic The Hedgehog Mega Man Worlds Unite, which adds Mega Man X and Sonic Boom into the mix... and halfway through that, even more crossovers from Sega and Capcom's properties were addednote . And while characters original to Archie's Sonic and Mega Man comics did not appear in the first crossover, they do play roles in the second one, with Xander Payne from the Mega Man comic playing a crucial role.
- Disney Mouse and Duck Comics had Donald Duck in "La Storia Infinita", where Donald and Mickey are tasked to save the entire Disney multiverse (meeting such various characters as Maleficent, Merlin, Kaa and Shere Khan, Chip'n'Dale ).
- Revolution (2016) helps IDW Publishing kickstart the Hasbro Comic Universe.
Films — Animation
- Who Framed Roger Rabbit crossed over Disney characters with characters from Warner Bros. and other studios, saying that they all co-existed with humans as actors in Hollywood, and that they all hail from "Toontown", which seemed to be half Los Angeles and half Alternate Universe.
- Toy Story features many toys from rival companies as major or minor characters including Mr. Potato Head, Barbie, and LEGO among many others. (And probably some expies too.)
- The Shrek films do this to fairy tale characters.
- Wreck-It Ralph does this with arcade video game characters.
- The LEGO Movie features Batman, Superman, Wonder Woman, Green Lantern, The Flash, Gandalf, Dumbledore, Milhouse, Speed Racer, the Teenage Mutant Ninja Turtles, Han Solo, Chewbacca, C-3P0, Lando... and that's not including characters from LEGO's own themes!
- Food Fight did this to advertising mascots (called "Ikes" in the film - the characters' slang for icons).
Films — Live-Action
- The Monster Squad had Dracula as the Big Bad who controlled all of the other classic movie monsters: Frankenstein's Monster, the Wolf Man, the Creature from the Black Lagoon and the Mummy. There is also a cameo by Abraham Van Helsing.
- The Area 52 scene in Looney Tunes: Back in Action involved the heroes facing off against Marvin the Martian, who led a group of sci-fi aliens which included a Triffid plant, the eponymous Robot Monster, the mutant from This Island Earth and even freaking Daleks!
- Many Seltzer and Friedberg works, such as Epic Movie and Disaster Movie, could be considered Massive Multiplayer Crossovers, insofar as they feature many characters and plot elements (or weak parodies thereof) from recent movies and mash them all together. By all rights, this really should produce something worth watching on some level.
- A version of this in Star Trek: Generations, which featured the captains of two Enterprises from completely different eras (Kirk and Picard) in the same film. Star Trek has done this numerous times, if you consider the different series separate entities of the same intellectual property.
- Van Helsing, which features the eponymous monster hunter battling Dracula, a werewolf, Frankenstein's Monster, Igor and Mr. Hyde.
- Done with toys in The Indian in the Cupboard.
- Mega Monster Battle Ultra Galaxy Legends The Movie fuses many Ultra kaiju from many different series into one movie.
- And with horror-movie creatures in the Waxwork movies.
- Marvel Cinematic Universe:
- In 1959 a movie was released called Alias Jessie James starring Bob Hope, who was a big fan of TV westerns; he used his clout to include characters from nine different shows in what would turn out to be the first of three Western massive multiplayer crossovers. People appeared in that movie from The Lone Ranger, The Gene Autry Show, Annie Oakley, Davy Crockett, The Life and Legend of Wyatt Earp, Gunsmoke, Wagon Train, The Roy Rogers Show and Maverick.
- In the 40th Anniversary OOO, Den-O, All Riders: Let's Go Kamen Rider has all of the main riders from Kamen Rider #1 to Kamen Rider OOO.
- Cirque du Soleil: Worlds Away takes elements from the seven Cirqu Du Soleil shows in Las Vegas.
- The Disney Channel original movie Descendants does this with the offspring of Disney characters, living in the United States of Auradon, which unites the various fairy tale kingdoms into one land, while all villains were segregated to the Isle of the Lost. When the Disney Villains' offspring get a chance to redeem themselves at Auradon Prep, the land's school, this trope really comes into play. And it is even more expanded in the spinoff series Descendants: Wicked World.
Myths & Religion
- The Argonautica (more commonly known by the adaptation Jason and the Argonauts) by Apollonius of Rhodes (3rd century BCE) is one of the very first Massive Multiplayer Crossovers, arranged in what would become a fairly classic method — basically throwing one or two dozen heroes from various separate Greek myth cycles together on a boat with a common mission. This of course makes the Massive Multiplayer Crossover Older Than Feudalism.
- Many of the same characters also appear in the story of the Kalydonian Boar Hunt — which, Depending on the Author, may occur before or after The Argonautica.
- According to some religious studies texts, this has also gone on in many, many other myths: the most notable involve various saints meeting each other. This goes on even today.
- Dramatic Dream Team (basically a parody of American wrestling), Pro Wrestling NOAH (American style matches only with a more realistic take and a more formal presentation), Pro Wrestling Zero 1 (even more emphasis on technical matches than NOAH but have tendencies toward exaggerated gimmicks and bizarre angels), Michinoku Pro Wrestling (largely based on Mexican Lucha Libre though there are some "Japanese strong style" staples) and IWA Japan (features "hardcore" wrestlers and has strong Puerto Rican influences) all got together to do a Differ Cup, which was as odd and entertaining as that many collaborating together sounds could be.
- In its early years, Ring of Honor was involved in a three way cross promotional rivalry between itself, IWA Mid-South and NWA Wildside. DO OR DIE II had the additions of NWA Midwest, NWA Florida, PCW, So Cal Pro and Pro Wrestling Guerilla.
- Sumie Sakai's We Love Sabu benefit show on April 17, 2005 at the Tokyo Differ Ariake had former FMW wrestlers Masato Tanaka, Mr. Gannosuke, Megumi Kudo, Kintaro Kanemura, Tetsuhiro Kuroda, Mammoth Sasaki, GOEMON, Onryo, Hido, Shark Tsuchiya, Hisakatsu Oya, Ricky Fuji, Miss Mongol, Gosaku Goshogawara, Kaori Nakayama and Hayabusa to represent the then dormant promotion, Ryuji Ito, Necro Butcher and Daisuke Sekimoto from Big Japan, Crazy SKB and Shinobu from 666, The Apache Army's Akrangers Takashi Sasaki & GENTARO, Asian Cougar, Asian Condor, Asian Monkey, Lingerie Muto, GAMI, Fang Suzuki, Seiji Ikeda, Eddie Edwards and The Sandman.
- In 2007, Alex Shane and Doug Williams called sixteen promotions to Liverpool England for a "King Of Europe Cup". Jody Fleisch represented 1PW, Claudio Castagnoli represented Chikara, Chris Hero represented CZW, Ryo Saito represented Dragon Gate, El Generico represented the International Wrestling Syndicate, Matt Sydal represented IWA Mid-South, PAC represented IPW:UK, Davey Richards represented Pro Wrestling Guerilla, Go Shiozaki represented Pro Wrestling NOAH, Trent Acid represented Pro Wrestling Unplugged, Martin Stone represented Real Quality Wrestling, Nigel McGuinness represented Ring of Honor, Rhino represtned TNA, Ares represented westside Xtreme wrestling, Zebra Kid represented World Association of Wrestling and Williams himself represented Premier Promotions. In addition, there were two "Taste Of IPW:UK" pre shows.
- Vendetta Pro started hosting Casino Royale crossovers in conjunction with the Cauliflower Alley Club in 2011, which also saw the involvement of Adrenaline Unleashed Wrestling. 2014 saw collaboration between Dropkick Depression, Gold Rush Pro Wrestling, the NWA, All Pro Wrestling and ChickFight for a two night Casino Royal event.
- Sendai Girls Pro Wrestling hosted the Dantai Taikou Flash Tournament in November 2011. Teams from JWP, Diana, REINA, WAVE, Ice Ribbon and Wonder Ring STARDOM entered it.
- The World Wrestling League has been on a mission to facilitate them since 2012. In Bolivia, it pitted wrestlers from multiple associates such as Dominican Wrestling Entertainment and Peru's Leader Wrestling Association against locals from La Paz based New Xtreme Order at the Campeones Del Ring: Hacedores de Proezas event on June 25th, 2013. It even got representation from a non associate, Ring Warriors.
- nCw Femme Fatales XI boasted a "Triple Main Event" featuring championships of three different women's promotions from three different countries all on the line. The Bellatrix World Title(UK), SHIMMER Title(USA) and nCw FF International Title(Canada).
- The BBC Radio 4 series The Rivals is a series of adaptations of various Victorian detective stories by people who weren't Arthur Conan Doyle, based on the short story collections The Rivals of Sherlock Holmes edited by Hugh Green. What makes the radio series a Massive Multiplayer Crossover rather than a sequence of unrelated dramas is that Inspector Lestrade is added to every story as The Watson, placing them all in the same Verse.
- Heroes and Monsters of the Milennium is a conversion for the Unisystem RPG ruleset, mixing Buffy the Vampire Slayer/Angel with everything from Marvel and DC Comics to Stargate SG-1, Godzilla, Ultraman, Lyrical Nanoha, Gargoyles, Mahou Sensei Negima!, the works of H.P. Lovecraft, Mazinger Z and many others. With considerable overlap in themes, races, and technology.
- Chaos TCG, Sieg Krone and Weiss Schwarz TCG feature characters from several anime series.
- The Spelljammer and Planescape settings were designed with this in mind. Spelljammer in particular has rule books dedicated to detailing the Crystal Spheres of settings such as Krynn, Abeir-Toril, and Oerth. Where as Planescape has portals to every type of world imaginable.
- Collectible Card Games that operate off of a Universal System allow for this; the Universal Fighting System lets you pit Chun-Li against Nightmare, the VS System crosses over Marvel Comics and DC Comics, and the Crusade System lets you pair Spike Spiegel, Edward Elric, and Cutey Honey with Humongous Mecha from Macross, Super Robot Wars Original Generation, and countless others.
- Similarly, the Hero Clix tactical miniature combat game works on a Point Build System basis and includes characters from many comic books (Marvel and DC, but also "indie" ones); Superman, Dhalsim and Dark Phoenix against Dr. Manhattan, Beta Ray Bill and someone else to match character points is a perfectly reasonable battle.
- Ani-Mayhem, a Collectible Card Game produced in the middle 1990s by Pioneer Entertainment that set characters from many different anime settings — surprisingly including many series licensed by companies other than Pioneer — in a grand romp across their various worlds.
- Seussical has characters from several of Dr. Seuss' books
- Several examples in the Disney Theme Parks. The biggest example is Fantasmic!, where a Legion of Doom of Disney Villains invade Mickey's mind.
- At Universal Studios:
- The Machinima Beans. Firstly, it crosses over characters from three different series and is made by three different machinima directors, then the storyline involves various internet memes... Oh. And it's made on Super Smash Bros.. Making it a crossover on a crossover.
- Technically, any community-made Machinima will have this in spades. Want to see Duke Nukem appear together with some Daleks? It's been done.
- Tonin: After the series ended, some characters featured in "Transando Essa Transa", a web animation story featuring characters from "Tonin" and from other series belonging to the same website, namely "Espinha & Fimose"; "Só Levando"; and "Tobby Entrevista".
- TV Tropes:
- Our own Trope Pantheons. Characters from across all fiction gather together as deities, and presumably alternate between annoying each other, and fighting the villains.
- TV Tropes has one for the works of the Walt Disney Company called Friends And The High Council.
- The Massive Multi-Fandom RPG, TV Tropes' own Mega Crossover Play-by-Post Game. The premise: a mysterious, all-powerful being known only as The Troper has ripped dozens of characters out of their universes and dumped them into an enclosed city with no way out. Each new day the city's inhabitants are subjected to a new, often absurd, scenario called a "curse"—having their genders reversed, being transformed into animals or being transported into a dinosaur-infested jungle. The game has included characters from Pokémon, Fullmetal Alchemist, Ghost Recon, Valkyria Chronicles, X-Men, Mass Effect, Lost, Star Trek, Danny Phantom, Halo, Tengen Toppa Gurren Lagann, Metal Gear Solid, No More Heroes, Star Wars, and Kingdom Hearts among many, many, many others. Season 2 began almost as soon as Season 1 ended, and has already featured characters from Soul Eater, Mega Man X, Firefly, Lyrical Nanoha, Yotsuba&!, Green Lantern, Neon Genesis Evangelion, Castlevania and more.
- TV Tropes' very own Alternate Reality Game The Wall Will Fall has many fictional characters entering the real world.
- The number of franchises characters come from in Campus Life is absurd. In a short list there's EarthBound, Sonic the Hedgehog, Pokémon, Soul Calibur, My Little Pony: Friendship Is Magic, Star Wars, Pikmin, Klonoa, BlazBlue, Portal, Stargate, Dragon Ball, Iron Man, and many, MANY others.
- The Fictional ISOT Map Game series of AlternateHistory.com takes its premise as being about 2-dozen or so nations from different works of fiction suddenly being transported to a "blank" Earth without sentient life.
- Although there are many similarly-themed RPs, Milliways Bar deserves mention just for its size. The basic premise is that any character from any fandom can find themselves at the titular bar... and sometimes it seems like just about everyone has.
- Destroy The Godmodder: And how. Players can summon, as entities, anything from any fictional work to fight for them. This is the plot at the moment (in DTG 2):
- Minecraftia, the setting of the game, is threatened by the Godmodder, a mysterious employer who convinced Doc Scratch, Lord English, and the Condescence to invade it, and team of Well Intentioned Extremists known as the counter-operation that was set up my the U.S Government and is made up of an AI called Project Binary, GLaDOS, and Bill Cipher.
- The heroes consist of the insane king of the Nether accompanied by Midna, who wields the Twili version of the Master Sword, an elven mage who happens to be an alien from a Sburb session, a warrior-engineer from the Warhammer 40K universe, another elf, this time an engineer who is companions with an iconic drunken robot and owns a space station populated by a small army of kerbal researchers and run by HAL 9000.
- The premise of Trespassers Of The Multiverse Gaiden is characters coming from different worlds to make a Last Stand against a Horde Of Ancient Locusts.
- City of Lost Characters (a Spiritual Successor of sorts to the Massive Multi-Fandom RPG, above) where characters from all over the multiverse are trapped inside an ever-shifting city and subject to a series of challenges.
- The Game in which Life In A Game takes place seems to take all video games as true, with Zelda appearing alongside Master Chief, and Frog serving as the hero's Jerkass Mentor.
- That Guy with the Glasses
Ask That Guy: (speaking to the various reviewers present) In fact, I think there's a lot of you who want to do crossovers, aren't there? Because everybody really eats that shit up.
- The one year anniversary video. Basically, in a Chicago hotel 20 contributors of Video Review Shows beat up one another in an Ultimate Showdown of Ultimate Destiny, climaxing in Super Mega Death Christ vs. Giant Robotic Donkey Kong Jesus riding a puff of smoke blowing up. You know what? Just watch it.
- All the cast stayed in Chicago for a couple more days to film crossovers after this. Highlights include Linkara being force-read his own Massive Multiplayer Crossover fanfiction by the Sage, the Ultimate Warrior writes a comic series so bad that reality breaks down and Linkara and Spoony keep changing into different Alternate Universe selves and the Critic and Nerd joining forces to review... a Making Of of a Teenage Mutant Ninja Turtles Tour. Yeah.
- Later on when faced with Uwe Boll's Alone in the Dark (2005), the Nostalgia Critic gave up on reviewing it. Until! Spoony and Linkara arrived to assist him.
- 2010 kicked off with an epic review of Dragon Ball Evolution, starring Paw, LordKat, Rollo T, Hopewithinchaos, and Y Ruler of Time, with guests including LittleKuriboh, MasakoX and The Happy Video Game Nerd. This was recorded while everyone was attending MAGFest.
- The Two Year Anniversary is another huge crossover event. And in turn, it allowed some once-in-a-lifetime crossovers as by this point, quite a few reviewers are from around the world.
- In 2011, things repeated. Y Ruler of Time used MAGFest to do another multiple reviewer crossover (The Last Airbender, with Todd in the Shadows, JesuOtaku and RolloT, plus various cameos). And Year Three had a crossover series and various individual joint reviews (Todd even opens his one saying that the trip means crossovers... and gets shot down by three people before Film Brain accepts to watch a movie with him).
- And once again in 2012. However, this time it was Linkara that used MAGFest for a multi-reviewer crossover (Southland Tales), and Year Four had a mini series that's a sequel to the previous one and more individual crossover videos.
- The original The Ultimate Showdown of Ultimate Destiny flash video. Good guys; bad guys; explosions as far as the eye can see. Way too many pop culture icons to count.
- Symphony Of The Blood, a fake video game crossover between all the characters of the Star System of Osamu Tezuka.
- The Slender Man Mythos stories tends to have the blogs mix together. For example, M of The Tutorial regularly participates in Damien's blog, Dreams in Darkness.
- John C. Wright has come up with a campaign setting (further down the page) which revolves around "anything goes", and incorporates roughly a billion various setting and universes into one complex setting rife with secret societies and inter-universal conflicts.
- Warp Zone Project happens in a world where all fiction is actually piece of earth's true history, which implies this trope coming into play.
- Monster Island Buddies: Not only do we get characters of the Godzilla franchise and many other kaiju films. Plenty of other fictional celebrities show up on a regular basis, ranging from Anime and Video Games, comics and other movies, to even the Disney Animated Canon. Some play prominent roles, such as Mr. Fantastic but most are usually cameos.
- Vinny's Tomodachi Life streams feature quite a cast, including Peach, Bowser, Toad, Tingle, CDi Link, Lolly, Little Mac, Gabe Newell, Gordon Ramsay, Seabiscuit, a Klingon (In-Name-Only), and David Bowie.
- Disney owns all the characters it uses plus a whole network. House of Mouse has Mickey and Co. as hosts of a nightclub/theater, with the characters of the feature films as the audience.
- Many classic Hanna-Barbera characters have been used across the board, in shows like Laff-A-Lympics and Yogi's Gang; this is still done, but with a more satirical bent (e.g., Harvey Birdman, Attorney at Law). The largest gathering of characters, however, came with a Hanna-Barbera 50th anniversary special in 1989 as all the characters gather together to pay tribute. This doubles as Roger Rabbit Effect as they interact with Joe and Bill themselves, along with special hosts Tony Danza and Annie Potts.
- Another Hanna Barbera effort issued in 1981, Space Stars, featured a "Space Stars Finale" crossover at the end, where the coalitions from at least two of the segments — "Space Ghost," "The Herculoids," "Space Teens" and "Astro and the Space Mutts" — teamed up in the final segment to defeat the bad guys. Often, there were at least three of the coalitions, while at least once all four teamed up.
- Nearly all recent Warner Bros. animated television series made references and overt cameos with one another.
- The early-90s public service announcement Cartoon All-Stars to the Rescue had characters like the Teenage Mutant Ninja Turtles, The Smurfs, Winnie the Pooh, the cast of Ducktales, and many others team up to teach a single kid about the dangers of drugs and save his sister from same. Although, if you can see Smurfs, there's a good chance you're tripping balls already.
- The '80s cartoon Defenders of the Earth starred King Features' most famous adventure-hero characters: Flash Gordon, The Phantom, and Mandrake the Magician (along with his sidekick, the strongman Lothar).
- Much earlier, in 1972, the one-off animated special The Man Who Hated Laughter united all of King Features' popular characters — meaning not only Flash, the Phantom, Mandrake, and Lothar, but also the likes of Popeye, Blondie, Snuffy Smith, and Beetle Bailey.
- Captain N: The Game Master featured a mishmash of characters who appeared on the Nintendo Entertainment System done wrong. Most of the episodes took place in the neutral Videoland, with characters like Simon Belmont, Mega Man (Classic) and Pit hanging around, even if In-Name-Only. Link and Zelda from The Legend of Zelda (more accurately, from the Zelda cartoon) appeared too.
- The Children in Need music video "Peter Kay's Animated All-Star Band", which features nearly every significant British Stop Motion characters with a few 2D British and American characters broadcast "live via satellite", including Roary The Racing Car, Fifi And The Flowertots, The Wombles, In the Night Garden, Angelina Ballerina, Scooby-Doo, Bagpuss, Bob the Builder, Ben 10, Thunderbirds, Postman Pat, Spongebob Squarepants, Fireman Sam, Camberwick Green, and Paddington amongst others. All singing parts of the characters by their original voice actors. The video took two years to produce, and it's for charity.
- Done with advertising mascots in the short film Logorama. It won the 2009 Oscar for Best Animated Short.
- The Rosey and Buddy Show, a 1992 TV special produced by Nelvana, featured not only animated versions of Roseanne and Tom Arnold, but also the Care Bears, Beetlejuice, Tom and Jerry, Droopy and even Wile E Coyote's stunt double.
- The Uncle Grandpa short "The Grampies" is an award show for Cartoon Network stars be they from classic shows like Dexter's Laboratory, Johnny Bravo and Foster's Home for Imaginary Friends, or currently airing shows like Regular Show and The Amazing World of Gumball. There were even voiced cameos from Steven Universe, Jake the Dog, Belson, and Reboot!Buttercup, mostly complaining about how Uncle Grandpa is winning every award.