Everyone remember "Capcom Versus Whatever"? Well I thought it would be amusing to see how many worlds can be linked by their characters beating the crap out of each other in video games.
For starters, Capcom's Street Fighter, Final Fight, and Rival Schools share a world.
Marvel vs. Capcom brought in not only the Marvel Universe, but also Captain Commando, Darkstalkers, Megaman, Resident Evil, and Strider. Marvel vs. Capcom 3 had others like Devil May Cry.
Street Fighter x Tekken has SF characters fighting Tekken characters as they all pursue an unidentified object in Antarctica (there's no indication that the characters are meant to be from separate worlds, unlike the MvC series). Playstation versions have Megaman, Pac-Man, and Sony's mascot cats Toro and Kuro showing up.
The Sony cats, Dante, and Heihachi from Tekken also fight in this game. Note the characters from Metal Gear and God of War.
Now we must note that Tekken takes place in the future of the Soulcalibur world, as established by the presence of a Yoshimitsu in all the games. The Soulcalibur fighters have fought Link, Spawn, Darth Vader, Yoda, Ezio from Assassin's Creed, and... there's Kratos from God of War again.
Link of course has fought all the major Nintendo characters in Super Smash Bros., as well as Sonic the Hedgehog and Solid Snake from Metal Gear.
You know who else Solid Snake has fought? Everyone in this game. Like Optimus Prime.
I'm sure we could go on...
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