Bomberman joins!

Beast and Iceman Fight Spider-Man Villain Trapster

Yondu & Iron Man: The X-Men Rescue Mission!

Every Bonus Stage so far - Avengers United Battle Force

X-Men Team Up: Colossus and Iceman CPU Co-OP against Anaconda

Iron Fist & Iceman: Battling Asgardian Magic

CPU CO-OP in Aventers United Battle Force

I think I already saw this somewhere...

New boss from Super Valis IV: DS-30 Kai

New boss from Ghostbusters: Siren