X-Men fans who are eager to see the mutants make their Marvel Cinematic Universe debut in Avengers: Doomsday need to check out one of the franchise's best movies before it loses its streaming home.

According to a recent rumor, Marvel might have plans for X-Men villains, Apocalypse, and Mister Sinister in the MCU post-Avengers: Secret Wars. However, characters who will appear in Marvel Studios’ X ...