X-Men vs. Street Fighter is a port of the arcade game and requires the 4MB RAM cart.

The story revolves around the merging of the two worlds, Marvel Universe and Capcom Universe, where Apocalypse has the heroes and villains battle one another to determine who is the fittest. Vega (M. Bison in the US) and Magneto join forces to take on anyone who should oppose them, and, in like fashion, you must pick a team of Street Fighters or X-men, or both, to go after your opponents. Ryu, Ken, Cyclops, and Wolverine, amongst others, must band together to stop this uniting of worlds.

What separates this 2D Capcom fighter from others is the ability to switch between two fighters at any time. This is what the American PlayStation version lacks. This Saturn version also features large animated characters and utilizes the X-Men: Children of the Atom fighting engine with super jumps and 30-hit combos. Everything in the game is in Japanese -- although this doesn't stop the title from being easily playable. ~ Frederick Lewis Jones Jr., All Game Guide