The Marvel Cinematic Universe's Phase 6 could really benefit from a new theme: Former heroes who have become villains.

Marvel Phase 6 hasn't yet kicked off ... Marvel's most powerful superheroes face off against the universe's most powerful villains, so whatever goes down is bound to be pretty explosive.

Marvel Phase 6 is still 12 months away from starting to ... That's right, one of Marvel's most iconic villains has replaced ...