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Massive Multiplayer Crossover:
Advertising 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 , and Ben 10 all existing in the same universe, before the end of the Age of Superheroes happened.
Mythology and Religion The (a.k.a. Argonautica 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.
New Media 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 . Making it a crossover on a crossover.
Super Smash Bros. Technically, any community-made Machinima will have this in spades. Want to see Duke Nukem appear together with some Daleks? It's been done.
Should be noted that, given the natures of RPs, this Trope tends to pop up a lot.
The number of franchises characters come from in Campus Life is insane. In a short list we have 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, others.
MANY Stand Up Comedy
There's a -related comedy routine in which Mr. Spock, the HAL 9000 computer, and Obi-Wan Kenobi all appear on Star Trek 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
Tabletop Games The and Spelljammer settings were designed with this in mind. Spelljammer in particular has rule books dedicated to detailing the Crystal Spheres of settings such as Planescape 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 and DC, and the Crusade System lets you pair Spike Spiegel, Edward Elric, and Cutie Honey with Humongous Mecha from , Macross , and countless others.
Super Robot Wars Original Generation Similarly, the Hero Clix tactical miniature combat game works on a Point Buy 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.
Theatre has characters from several of Dr. Seuss' books
Is a conversion for the Heroes and Monsters of the Milennium Unisystem RPG ruleset, mixing / Buffy the Vampire Slayer with everything from Angel and Marvel to DC Comics , Stargate SG-1 , Godzilla , Ultraman , Lyrical Nanoha , Gargoyles , the works of Negima! H.P. Lovecraft, and many others. With considerable overlap in themes, races, and technology.
Mazinger Z , a Ani-Mayhem 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.
TV Tropes' own Trope Pantheons. Characters from across all fiction gather together as deities, and presumably alternate between annoying each other, and fighting the villains.
So Who Wins, a any character battle website which a crossover between anything can happen.
This Very Wiki has one for the works of the Walt Disney Company called Friends And The High Council.
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.