Avengers: Infinity War had the surprising return of one of the Marvel?s most important villains.
Captain America?s old enemy the Red Skull, who played a vital role in Thanos? quest for the Infinity Stones,
but could he also have a role to play in Avengers 4?
As Red Skull briefly serves as a kind of guide for Thanos in Avengers: Infinity War,
the demonic lord Mephisto served as a kind of vizier to the Mad Titan in The Infinity Gauntlet.