Cast: Chris Hemsworth, Natalie Portman, Christopher Eccleston, Kat Dennings, Tom Hiddleston, Idris Elba, Ray Stevenson, Zachary Levi, Jaimie Alexander, Anthony Hopkins, Stellan Skarsgard
Director: Alan Taylor ("Game of Thrones")
What to watch for: The second "Avengers"-related sequel of the year will be a good test of how large of an appetite audiences have for the continuing Marvel universe. There's a good chance the spinoff TV series "S.H.I.E.L.D." will have launched by this point too. How much is too much?