Marvel Studio head Kevin Feige announced at San Diego Comic-Con on Saturday that the upcoming Captain Marvel movie starring Brie Larson as the fighter-pilot-turned-superhero will take place in the 1990s. He also revealed that Captain Marvel will be battling a group of aliens called the Skrulls. The Skrulls are shape-shifting aliens and can pretend to be anyone else, so the introduction of these characters could upend the entire Marvel Cinematic Universe.