Massive Multiplayer Crossover / Webcomics

• There have been at least two webcomic Massive Multiplayer Crossovers: The Framed!!! Great Escape and the recently ended Crossover Wars.
• AGENCY by JediAnnSolo is an adventure comic staring Shadow the Hedgehog, Sandy Cheeks, characters from Animal Crossing, DW Read, Fox, Krystal, and Marcus McCloud, Pikachu, Parappa The Rapper, and The Pink Panther. Fox, Marcus, and DW are kidnapped, causing Krystal and Mrs. Read have hired the Pink Panther (who is a Private Investigator) to find them. He has hired Sandy to help with field work, and Krystal has hired Shadow as her body guard.
  • The series has also spawned a series of non-canon pictures featuring Shadow and Sandy as a couple. JediAnnSolo has repeated said that she currently has no plans to pair them up in the actual series, but she has also said that they do make for a dynamically interesting couple.
• Akuma's Comics is a fighting Sprite Comic that starts with Sonic characters, before going on to include basically every series that the author likes and has access to sprites of...along with original characters and characters he's able to have sprites made of.
• And Shine Heaven Now started out as a Hellsing fan comic, but as the series started dealing more with the main plot, it became this. It would take all day to list every intellectual property that got incorporated into the comic (because of all the cameos), so we'll just list the ones with significant importance to the plot: Read or Die, Emma: A Victorian Romance, Jeeves and Wooster, Revolutionary Girl Utena, Witch Hunter Robin, Good Omens, The Daily Show (and more significantly The Colbert Report which ends up getting a spin-off called The Eagle of Hermes), Little Orphan Annie and Vampire Hunter D. Yeah, those are just the important crossovers.
• Boneheads is a comic that stars several fictional skeletons hanging out with each other: Jack Skellington, Lewis Pepper, Brook, Sir Daniel, Manolo Sanchez, Sans, and Papyrus all have random skits together in a bar/cafe run by Manny Calavera.
• 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 Massive Multiplayer Crossover. Sadly, the author has lost interest in continuing the series and taken it down.
• Comic Book SNAFU: The first issue alone involves characters from Marvel Comics, DC Comics, Yu-Gi-Oh! 5Ds, and Fairy Tail.
• Deviant Universe is a comic project involving a huge number of original superheroes and villains from DeviantArt being part of a large superhero universe.
• Applies to Dragon Ball Multiverse, but for U2 it is even more of a crossover fest; a collection of many characters drawn by Akira Toriyama. How many can you recognize? In fact, Toriyama HIMSELF appears.
• Final Blasphemy has characters from Mega Man, Final Fantasy, Super Mario Bros., and several other gaming universes.
• Gamer9 is set in a world inhabited by all kinds of video game characters.
• Though it never crossed over with both at the same time, It's Walky!! had crossovers with both Melonpool and Fans!! that established both as part of its universe (or multiverse in the latter case) and which ended up having a lasting impact on its storyline.
• Kevin & Kell and General Protection Fault had an arc where two GPF characters wandered into K&K's Domain world. The artists managed to work the events into both their storylines that were running at the time, and apparently drew a strip each day—both had two-strip days where the storyline advanced.
• The Lady Spectra & Sparky storyline "Demon War" featured guest-stars from several different 1990s-era mini-comics, including Mister Mid-Nite, Doc Saphire, Cassiopeia the Witch, and Madame Boogala.
• Least I Could Do recently finished the Ultimate Final Civil War Invasion Crisis Thing, which featured the gaming webcomic characters trying to kill the slice-of-life comic characters. (Cyanide and Happiness, meet xkcd.)
• Ménage à 3 and Sore Thumbs crossed over at some point and are implied to be in the same universe, and Ménage à 3 crossed over with School Bites. If this keeps up we'll wind up with every webcomic crossing over to one another.
• The writer of No Rest for the Wicked footnotes her comics so you can get all the fairy tales she's using characters from.
• Platformers was planned to be a crossover starring Mario, Luigi, Princess Peach, Sonic, Crash, Rayman, Banjo, Kazooie, Shantae and Klonoa.
• The webcomics Queen of Wands and Something*Positive had a couple of crossover stories. Later, after QOW ended its run, Kestrel showed up as a semi-regular on S*P.
  • Choo-Choo Bear hired the Pet Professional from the webcomic of the same name to kill his homicidal cousin Twitchy-Hug.
  • And recently Davan from S*P has been seen texting with Girls with Slingshots after running into her at the wedding of Jameson and Maureen.
  • Choo-Choo Bear later had kittens with Sprinkles of Girls with Slingshots, one of whom Davan gave to Roz of Shortpacked!, and another is by Hazel to her cousin Robyn from All New Issues.
    • Even better, none of those strips have been shy about crossovers of their own. QOW drags in Punch an' Pie, which stars its Breakout Character Angela; Shortpacked!, a branch of the Walkyverse, pulls in Fans! and Avalon.
• Questionable Content has crossed over with Diesel Sweeties, which has itself crossed over with Scary Go Round. Questionable Content has also crossed over with Applegeeks, which, having crossed over with Ctrl+Alt+Del, would turn the whole group into one quasi-incestuous ball of webcomics. I'm reasonably certain that PvP has been referenced in at least one of these, probably Diesel Sweeties, and since the former has crossed over with Penny Arcade more than once, it's completely cross-eyed insane over there.
  • And the Author of Ctrl+Alt+Del exists as a person in the Penny Arcade universe, so that means, if you follow the little red thread of universal strings, that he exists in the same plane of existence as his characters..
  • Don't forget that Applegeeks had a major crossover (well, on its end) with MegaTokyo at one point. Which chains the whole thing to a specific date, making things even crazier.
  • It gets better. Questionable Content is now having background extras as characters from other comics like Girls With Slingshots, Octopus Pie, Anders Loves Maria and Overcompensating. Since Overcompensating features the author and most people known in the webcomic industry, it means all these characters now exist in the same universe as their creators.
  • The cast of Shortpacked! has visited the Coffee of Doom coffee house from QC on occasion, including once when both artists did a take on the same scene. Combine that with the S*P Intercontinuity Crossover Nexus mentioned above, along with all their respective crossovers, and we have a massive webcomic universe that could give Marvel a run for its money.
  • Oh, and, Shortpacked! has crossed with Multiplex.
• Scoob and Shag is a crossover between every major Western cartoon between the Golden and The Millennium Age of Animation. Its primary cast alone contains characters from Scooby-Doo, Looney Tunes, Popeye, Inspector Gadget, several Cartoon Network shows, and Mickey Mouse.
• Sluggy Freelance hosted one of these during the Filler Arc "Sluggy Freelance: Where Are You?" When all of Sluggy's actors are kidnapped (a.k.a. Pete Abrams decides to take some time off) characters from several other webcomics are hired to fill in for them and/or find the kidnappers.
• Sonichu: According to its creator, takes place in Dimension C-197, which is this for everything barring a few exceptions. Even before the idea of a Dimensional Merge came into play, this trope applied on a much lesser scale. The comic itself features characters, settings, objects, and groups from Pokémon, Sonic the Hedgehog, Sailor Moon, Yu-Gi-Oh!, Aqua Teen Hunger Force, Beavis and Butt-Head, Family Guy, Futurama, The Ren & Stimpy Show, Transformers, Power Rangers, and Neptunia, to name a few.
• Starslip Crisis: Alterverse War is a mashup of a large number of science fiction webcomics, and had just started as of October 2007.
• Troops of Doom has G.I. Joe/Cobra and Star Wars Empire characters, as well as other random characters and an alien race called Legonians.
• Ugly Club is about an intercontinuity support group for Public Domain Characters with personal appearance problems. The group is led by The Phantom of the Opera, and its regular members include Frankenstein's Monster, Quasimodo, the Beast, and Gwynplaine.
• Several members of the "Webcomics Inc." social networking site collaborated on a crossover comic, where they made all their characters teen-aged and put them into high school together. The result, "WCI High", merged characters from "Good Times", "Mikey's Life", "Everyday Heroes", and "Big Sandy Gilmore". (Of these, only Everyday Heroes seems to be still actively updating.)

---