When it comes to comic book casting, it doesn’t get much better than the stars of Fox’s X-Men films. Fortunately, these X-Men are getting another chance to make good on 20 years of missed opportunities. With Avengers: Doomsday, Marvel’s most popular mutants are heading into a new cinematic universe, where they’ll team up with the mightiest heroes of Earth-616 against the threat of Doctor Doom. By the time Doomsday hits theaters this December, it will have been 20 years since we last saw Marsden truly in action as Cyclops. Avengers: Doomsday opens in theaters on December 18.