You have to defeat 50 foes with each character. But for some reason I do not know how to unlock Invisible Womans and Wolverines costume.
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complete new avengers to unlock hulk
there is a add on for it
you can't unlock hulk in the PC version only in the Xbox360 version
open game faqs,there is a cheat code in there just follow it
you can't cyclops isin't in the psp version of the game