I see Crazy!Cap coming back... well, crazy, and he steals/kidnaps Amnesiac!Tony, and together they start a confusing campaign against the Avengers, because the Avengers are evil now, and Cap and Tony are having trouble grasping the situation. Tony wears a cape.

Actually I have an outline for Amnesiac Cap and Amnesiac Tony somewhere, they ended up eloping to Aruba and taking out a small business loan to open an auto repair shop.