Disney+ has released a list of movies for fans to watch before the release of "Avengers: Doomsday" in December. The list includes more than a dozen films, starting with 2000's "X-Men" and its sequel "X2", as well as "Captain America: The First Avenger" from 2011.

These movies may provide a refresher for fans who have seen the Marvel Cinematic Universe films multiple times or an introduction for those who have not watched every movie, show, and short.

Further details about the list and its significance are available, including possible hidden clues about the "Doomsday" lineup.