Massive Multiplayer Crossover: Fan Works aka: Mega Crossover
Fan Fic
The example—the ultimate example—is the work known as Undocumented Features, created by Eyrie Productions Unlimited. More or less continually written since the early 1990s by a dedicated creative team, running into many many megabytes of stories, UF blends together so many sources that no one has a definitive count of them, and has successfully combined them all into a single galaxy-spanning space opera epic with an internal history of thousands of years. The earlier works are admittedly crude — the first installment was intended as a joking "we could do something like this" example meant to be discarded when the "real" writing began — but UF (and other EPU) stories since the middle to late 1990s have all been of exceptional quality and workmanship.
Also by the fine folks at EPU, Neon Exodus Evangelion starts off looking like just an ambitious Alternate Universe Fic for Neon Genesis Evangelion, but before long it becomes clear that this is a Mega Crossover world involving at least a dozen sources besides NGE, and that it only tangentially resemblescanonEvangelion. Interesting to note, that much as Evangelion was a deconstruction, almost an assault on the tropes of Humongous Mecha, Neon Exodus Evangelion is an assault on what the authors felt was the meaningless nihilism of the original, and the fic can be somewhat hard to warm to.
The Instruments of Time is a massive crossover fanfiction with more than fifty characters from many different works of fiction (including Dilbert, G.I. Joe and Tintin)) and shows various teams of heroes attempting to save the universe from destruction, while various teams of villains conspire to take it for themselves.
iFight Crime With Victorious takes Drake and Josh, iCarly, and Victorious, the latter which share their own universe, and puts them together for a superhero story.
A Game Of Gods involves a group of mysterious beings kidnapping a host of beings from across the multiverse and throwing them into strange and perilous situations. The main cast of characters are diverse, and many of the worlds that the characters visit are drawn from other works of fiction.
Age of Heroes is a roleplaying campaign which starts with Marvel and DC which then crams in anything that can be fit in. Castlevania, Soul Calibur, Yu Yu Hakusho, and more. Now it might seem that such a campaign would collapse under its own weight, but it seems to be doing quite well.
While Chess Piece is primarily a Danny Phantom based webcomic, it has enough characters from other Nicktoons intertwined in its story to constitute its own kind of Mega Crossover.
John Biles' Dance of Shiva blends five classic anime—along with cameos from and Shout Outs to at least a dozen other sources—to create a story that is by turns action-packed, comedic, and unabashedly mystical.
The forum itself has actually imposed upon itself a strict code of discipline and mutual convergence to root out any wanderings into Mary Sue territory, Fan Wank, or other forms of Sturgeon's Tropes. Because of the nature of the community, new authors are added regularly, but work quality and content is kept in line by a democratic system for new crossovers and ideas that will be accepted as {Canon}.
Currently the Clan features Shirou Emiya, 24 wives, and 28 children (Further additions have been capped at this number). This is not counting various relatives, family friends, and clientele that show up in the stories on a regular basis. Usually, each child gets their own crossover(s), while the entire family (or a part of it) may participate in a story sometimes.
A few of the authors have compiled their works here (many more stories have been added past this point).
Eureka, A fanfic that contains Ranma 1/2 and Eureka at its core, works the idea that there's another division of "Eureka". Namely, there's the American Normal Science Branch, and the Japanese MAD Science Branch. In the end, it includes Ranma 1/2, Eureka, The Road To Cydonia, Dragon Ball Z, Chobits, Project A-ko, Tenchi, Neon Genesis Evangelion, Cooking Master Boy, Yu Yu Hakusho, Bleach, Kim Possible, Venture Brothers, Knight Sabers, Robotech, Naruto (Naruto is actually only acknowledged as a manga, but still helps the cast), All Purpose Cultural Catgirl Nuku Nuku, Pokemon, Dexter's Lab, Jimmy Newtron, Invader Zim, X-Com, Men in Black, Pinky and the Brain, Full Metal Panic, Power Puff Girls, My Life As A Teenage Robot, Marvel Comics, Stargate SG-1, Power Rangers, Sailor Moon, Dark Titans (a fanfic), Raiders of the Lost Ark, and Gundam as, usually, vague little references that you will miss unless you know that series/movie/setting. However, some of them also play larger roles, or more obvious appearances.
The Fandom Wars is a standard example of a Mega Crossover, though it concentrates almost entirely on the two factions of the My Little Pony: Friendship Is Magic world, whom are being internally manipulated into participating in the War that they didn't want to join in the first place, and the Anime Faction, one of the 'Big Three' major military powers and most likely (at least at first) to win. The series can be found in four parts. Be warned that it is very middle-tier.
This reaches almost Lovecraftian proportions when it goes on to include all possible characters whose universes can be simulated by a Turing machine. Of course, most of them are off-screen.
Hybrid Theory by Blade and Epsilon viciously satirizes the Mega Crossover by presenting such a world — but then having some of its inhabitants realize that it couldn't possibly have existed before a certain point because of the conflicting backstories of its component parts.
The Insane Quest, a Play By Post Game, is an odd example. While it does take place in a universe that crosses over with Super Mario Bros, The Legend of Zelda, Pirates of the Caribbean, Naruto, Pokémon, One Piece, No More Heroes, and Pandora Hearts (among others), none of the characters from these series are the main characters. Instead, the story focuses on a cast of original characters and settings created (mostly) from scratch by the Game Master and the participants of the game, with the characters from the above series only appearing as supporting roles, cameos, and occasionally antagonists. But other than that, the concept is pretty much the same.
Due to the Massive Multiplayer Crossover nature of Kingdom Hearts, many fanfics based on that canon will also use it as a catch-all explanation for blending together pretty much anything and everything. Just explain it as a new planet and there you go.
Tsubasa Reservoir Chronicle is subject to this too for the same reason. There was actually a very short-lived (thank the heavens for it) fic with Tsubasa and Kingdom Hearts crossing over.
Dreamwidth is host to an ever-increasing number of what are called multifandom roleplaying games. Some rewrite characters to fit new settings, but most are true Mega Crossovers, bringing characters together from their home canons. Drama Drama Duck, for instance, uses the premise that people from different universes are somehow able to communicate with each other over the Internet (including people who can travel between worlds, allowing characters to meet face to face). Individual games can have very different setups, genres, possible restrictions on acceptable characters or canons, and guidelines like the involvement of OCs or canon OCs.
Maverick9871 has a habit of starting with a decent story idea, but within a few chapters the story spend more time introducing new crossover material than on the original idea.
Rob Morris' "The Never-Ending Battle". Take M*A*S*H as the core fandom. Add in that several of the characters just happen to be Highlander-style Immortals and that before becoming Mulder's nemesis the Cancer Man was running experiments in Korea in the early 50's. Oh, and Sherman Potter is descended from a BtVS-style Slayer and came home from WWI with one Nick Knight in tow. Then there's Hawkeye and Hot Lips' roles in the Eugenic Wars from Star Trek, not to mention the way that most of the human crew-members of Deep Space Nine can trace their family bloodlines back to someone who served at the 4077th. And let's not forget about BJ's wife Peggy... and her half-sister Samantha Stevens. By the time Godzilla shows up you don't even bat an eye. Of course Godzilla and M*A*S*H can co-exist in the same universe — giant lizard monsters aren't really that strange.
Neverending Struggle: Multiverse at War is a forum RPG based entirely on this trope. Basically, in a world where all fictional characters live, a war breaks out. Each separate faction (Individual Armies) is trying to take over the world. It has an incredible amount of 3 players, probably because of lack of advertisement.
Also, from the same person who manages that, comes Ookami no Monogatari and Wolfeye City. Ookami no Monogatari is about a group of characters from different dimensions (fictional works)—at the moment, One Piece and Mega Man X—being lead by a teenage girl to various missions. Wolfeye City also uses the Author Avatar trope, since it's about Alter-Egos, the comic representations of the author and some of her friends, fighting demons who are trying to destroy the city, who is filled with anime and video game characters. All three are Better than it Sounds. Though, Erase Alpha, the author, must love this trope.
Nicktoons Tales is a fancomic that sews all Nicktoons settings into one planet, as well as original characters living on that planet.
Also, in the same series, there is a planet with all anime settings sown into it.
Nuclear Fusion on the Anime Adventure. Noteworthy because it manages to mix up elements of over one hundred completely unrelated series and manages to combine them into a single massive Fallout inspired Post-Nuclear world, and not only make sense, but tell an interesting and unique story.
Are you calling my board weird? Note that neither the Corinthian nor Edward Cullen are viable canons for this board. Note also that it's set in a very not-accurate quasi-English France. Nitpickers beware. I mean, they are musicals... And expect Oliver! canons shortly. We're that expansive. Unless you want to try and Steampunk it up. Then the answer is no.
That's good weird. I play on it, and love the place more than probably any other site on the internet.
Ellen Brand's Personality Conflicts universe melds Power Rangers with a spade of unrelated properties, including Danny Phantom and Detective Conan, but her masterpiece is probably the Trial Arc, where the Rangers are forced to defend Zordon in galactic court for his actions over the course of the series, while a resurrected villain forces the VR Troopers, Beetleborgs, Masked Rider, and previous crossover allies the Ghostbusters to defend Earth. Also notable as the storyline provides a "proper" finale for each of PR's sister shows.
PRIMARCHS not only pulls this off, but justifies it from the 2nd arc onwards by the inclusion of an entity called the Plot Hole.
Prodigy. Holy crap. This story is actually pretty damn insane, and not just for the fact that it's a crossover between, ahem: Harry Potter, Crime Scene Investigation, House, Grey's Anatomy, Numb3rs, Psych, Lawand Order:Special Victims Unit, Naval Criminal Investigative Services, and possibly even more. No, I'm not kidding. Nearly the entire damn story (Which is 140,841 words, if I may add) is so damn awesome, words don't describe it, while it does have the thin base of a lot of HP AU's (Harry Potter's twin is named BWL, Harry is ignored.) If runs away with it and crashes that idea into a building, then lights the building of fire. This is easily in the Crowning Moments Of Funny as well.
The Disney/NonDisney editor community on YouTube does this often in their videos but seem to be having their own crossover event with a project calledThe Sixth Sense. It involves an amalgam of plots reminiscent of X-men, witch hunts, government conspiracies, giving various animated characters powers and having them interact. Already, people have mini-storylines and connections to other characters which will probably continue into the official project.
It has also inspired a fanfiction which can be read here.
Sleeping With the Girls, by Admiral Tigerclaw, is essentially a Deconstruction of the Self-Insert Fic, in which a normal guy (albeit one who's been through boot camp) is thrust into various fictional worlds by an unusual mechanism: He 'jumps' to each world the moment he falls asleep, and he wakes up in the same bed as a female character. Naturally, Hilarity Ensues. Note that the action scenes are military-focused (with good reason) and many times more epic than you may remember them being in that particular episode.
Sonic the Hedgehog: Rise of Nazo is a Mega Crossover that is based on Nazo Unleashed. Two more Mega Crossovers followed after it.
Another Sonic Mega Crossover Catch Me if you Can has Dr. Eggman skillfuling dupeing a pack of Magical Girls to attack Sonic. This is one of his most clever plots as Sonic is shown to have gynophobia.
Justified (well, as justified as such a thing can be in the fanfic industry) in the Sailor Moon Expanded universe; a method of trans-dimensional travel allows characters from the Sailor Moon universe to travel to other dimensions on the conceit that every anime and manga ever produced has its own separate universe. The various Dark Kingdom Renegades seemed to run into this quite often in their early years on Earth, having traveled to the worlds for Bubblegum Crisis and Ranma 1/2 just for starters, and later to Urotsukidouji (aka Legend of the Overfiend), where Titanite (youma Sailor wannabe, for those just joining us) encountered said Overfiend. With her disguise device set to Sailor uniform... and broken. Thankfully, the author managed to avoid following the obvious to its conclusion in a manner most awesome. And in an unfinished story, Titanite finds herself in Neon Genesis Evangelion, and unfamiliar with the series, tries to understand it in terms of the classic Humongous Mecha shows she's seen in the past.
To make things doubly interesting, the laws of these various dimensions seem to apply themselves to trans-dimensional visitors over time. Thus, in the Ranmaverse, Calcite takes on the mannerisms of a wizened martial arts master, and felinoid Margrave becomes even more catgirlish than usual. The DKR use this to their advantage; as long as they remain in the Sailor Moon universe and work on behalf of the forces of good, they are nigh indestructible.
Anything by Shadow Crystal Mage will invariably become this once it has enough chapters. Special mention also goes to Raikiri Triken.
Tales From The Barman... and Tales From The Barman... Part II implement a megacrossover through the device of a bar run by Xander of Buffy the Vampire Slayer, in Cleveland after the end of the series. Each chapter is its own small crossover fic, ranging from vignettes to full stories, with characters from dozens of settings ranging from Michael Moorcock's Eternal Champion to Cheers making an appearance and telling their tales.
Author Tenhawk is almost as notorious for this as he is for writing nothing but Xander-Sue.
The story The Terran Jedi over on Twisting The Hellmouth throws in many random cameos into a story where Xander is a Jedi Master, including but not limited to Stargate Verse, Discworld, Torchwood, Harry Potter, and Series/Frasier (of all things).
The Stargate parts have become so frequent and so large that they have long since gone beyond cameos, and at this point it reads like a straight crossover.
The Three Kingdoms is another mega-crossover involving characters and objects from different game franchises, novels, movies and anime to suddenly start appearing in our world at December 21 2012, marking the Doomsday. After a short amount of joy, politics decided that these 'newcomers' were dangerous due to their magic capabilities, superior technology and other abilities. An event called Bad Apple Event led to Hakurei Reimu from the Touhou video game franchise annexing the entire US which could be read on the prolouge. The Vocaloids and Miku eventually caught wind of the event and decided to annex other countries in the name of protecting them from Reimu. Of course, eventually, the kingdom of Gensokyo and Yamaha formed with war between them. They were soon joined by Haruhi no Suzumiya after realizing her god-like powers. By then, the three kingdoms have formed and the crossover 'The Three Kingdoms' led to Haruhi planning an invasion. This mega-crossover contains a variety of different creations. (From HMS Thunderchild, Alex Mercer, Familiar of Zero, Star Wars, Strike Witches, Metal Gear and even One Piece)
Three Messengers is somewhere between this trope and a Crossorgy. Production at present is slow because of how much there is that the author isn't sure about in one of the source works.
TKR2, a now-defunct massive fanfic series by multiple authors started off as a fairly straight Knight Rider/Team Knight Rider fanfic, then expanded to cross over with Star Wars (a lead character becomes a Jedi Master), then Star Trek (another lead character becomes a Borg queen—one episode has our heroes on a chase across dimensions, culminating in the Starship Voyager landing to help talking cars fight Darth Vader, while a young Gene Roddenberry, Glen Larson, and George Lucas, who had apparently been out necking, look on), The Invisible Man (He gets a talking car), Highlander (yet another character is an immortal—and also a Jedi), Hercules: The Legendary Journeys (In a very complex crossover, a character described as looking like Kevin Sorbo teams up with the real Kevin Sorbo, and also Hercules), Teletubbies (They're evil aliens), Barney (He's A Great Old One), James Bond (He teams up with our heroes to stop a supervillain plotting to build a giant lightsaber with which to cut the earth in half), and Survivor. Really.
The Traitor Game is like CLUE. Except with various fictional characters dropped into a setting and violently murdering people amidst a usually epic background. So far, we've had Trigon getting beat up by Asuka, Rei,Cyborg Superman, Doctor Doom 2099, and a slew of others by the usage of Yellow Lantern rings... actually, just go read the summaries there.
The Travelsverse is a collection of both Nintendo and other game series that are connected via Super Smash Brothers, by Bulbagarden Member Instrutilus. Though a majority of the action seem takes place on Sinumonas, the name of the Pokémon World here, the person in charge, Instrutilus, has expressed interest in looking at other series to help connect the universe, rather then just having Link and Samus live on the planet and several references to the Super Smash Brothers Core, a collection of the universes greatest fighters that was named after an old tournament they once participated in.
TRES is a lesser known webcomic which stars several characters from different anime and has a Tsubasa Reservoir Chronicle influence.
Ultimate Crossover Wrestling combines not just wrestling organizations (WWE, TNA, etc), but anime, games, tv and movies.
Vathara's Urban Legends universe, which includes or alludes to easily twenty or more series.
Chris Jones' short story The Virus—which was a originally a simple crossover between Ranma 1/2 and Tenchi Muyo! with a few cameos from other series—expanded unexpectedly into a shared-world megacrossover where characters from dozens of fandoms had to deal with the after effects of a Juraian virus which had incorporated Ranma's gender-bending curse into itself, and then transmitted it permanently to every living human.
Years ago there was a combination fanfic/webcomic called The Wrath of Invincar. The main characters of Slayers and Vision of Escaflowne, who had been placed in a Gilligan's Island-esque setting, set out on a quest to defeat...a green Smurf, with hilarity ensuing along the way. Such antics included Gaav settling an argument with Phibrizzo by pinning him beneath the Mystery Machine; much mockery by the French knights; and a showdown between Lina Inverse and Quick-Draw McGraw. Sadly, the story has since been taken off the Internet for space reasons.
The story was based in the same universe as those fics, but it was done by another author (all that's left of it now is the introductory page). Thanks for pointing those out, though.
You Got HaruhiRolled! usually isn't a crossover, but the court case arc has the conceit that all characters from all fiction exist in the same City of Adventure, so the author included cameos from every fictional universe he could think of.
Where on Earth, Spies is a Web Serial Novel that began as a crossover between Where's Waldo and Carmen Sandiego in which they are the best agents at two competing secret agencies. Foe Yay Ensues. After the first chapters, the author expanded into other properties, incorporating (among others) the GEICO Gecko, Erin eSurance, and Allstate's Mayhem. It can be found here.
Dave Stdider Pokemon Traner takes every character from everything you've ever loved, strips them of their canon personalities, and throws them into the pokemon world without explanation.
Torchic and Pals has LOTS OF Characters such as Pokemon, Happy Tree Friends, Skylanders, Moshi Monsters and many, many other Characters!
Advent Crossover Crisis, found here, combines over 30 pieces of fiction, although it kinda depends on how you slice it.
Abigail And The Rats Of NIMH combines several 80's and 90's Mouse World cartoons (Once Upon A Forest, The Secret Of NIMH, Chip N Dale Rescue Rangers, and The Rescuers), which could at least in theory take place in a shared universe, with a little imagination. The adventure starts when scientists from NIMH, in search of the intelligent rats that escaped from their labs years ago, raid Dapplewood forest (the setting of Once Upon a Forest), and the story develops into a Crisis Crossover as the scientists become more aware of the mouse civilization that's been right under their noses.
The grandaddy of all Fan Vids is the Daicon IV Opening, made for a Japanese anime convention in 1983 by a group who would go on to become Studio Gainax. It's impossible to list (although somebody tried) all the sci-fi, fantasy, movie, comic book and game references found in these five incredibly animated minutes.
Niconico video list Muv-Luv Crossovers, blends the Unlimited storyline of Muv-Luv, and spliced it with Gunparade March universe, in addition to having characters from Zegapain. Running parallel to the story is the Planet Fairy setting of Sentou Yousei Yukikaze, in which Ryu Sohma becomes the copilot to Rei Fukai after his transformation from Takuto Kaneshiro. And both worlds are fighting what seemed to be a combination of JAM, BETA, and/or Festum, and it seems that Sumika is the AI core of Yukikaze, linking the two worlds. The story is told in Visual Novel-style dialogues interspersed with footages from anime/games related to the media, as well as careful splicing to ensure that everything is consistent. The "opening" animation of the series proper is in the second episode, but while it starts with Muv-Luv setting and the beginning of Argento Soma, Yukikaze's arc proper starts at episode 6. As of 12 February 2011, the series has 10 episodes ranging from 20 to 30 minutes. Unfortunately, since the series is very heavy on dialogues, non-Japanese speaking viewers would have quite a problem in following it.
Many M.U.G.E.N video series on Youtube, when they're not just series of fights, will be a Mega Crossover, such as:
Phoenix Wright Anime Attorney is an AMV that's edited in a way that makes it seem as though Phoenix Wright is interacting with characters from various other anime series.
Mushroom Kingdom Fusion, a fangame-in-progress, sends Mario and Luigi (later a host of others) across a few of the most famous gaming franchises in order to bring down Legion before he can successfully fuse all worlds and drain the energy from the reaction... or something. The creators are keeping the plot a secret—will they finish before it becomes the gaming equivalent of a Dead Fic? Given the ambition of the project, I'd have to guess no... but hey, Solid Snake is mentoring them! If that doesn't make it awesome, what does?
Its sister project Super Mario Fusion Revival, though more Mario-centric (as in, only Mario and Peach thus far are playable characters), still features levels and areas from many other franchises once outside the first world. A smaller and less ambitious project then MKF, but built with a stronger engine and with great care put into each stage. Take a look for yourselves.
Card Sagas Wars (see here) is another ambitious fangame, combining many characters from several different games. It's the sort of thing that can only exist due to dedicated fans or else the legalities of it would make everyone's heads spin.
Super Smash Flash, a series of Super Smash Bros fangames that add third-party characters and anime characters. The second game is currently in production.
Abobos Big Adventure has characters and elements from several dozen NES games mashed together.
