Last month, Captain Marvel debuted in theaters, introducing audiences worldwide to Brie Larson's Carol Danvers. Fans won't have to wait long at all to see her again as she'll be appearing in the upcoming Avengers: Endgame as a crucial piece of the film. Despite the fact that Captain Marvel arrived in theaters first, Larson's first time playing the character was actually in Endgame. Thus, she had to work closely with both the Russo Brothers and her Captain Marvel co-directors, Anna Boden and Ryan Fleck, to nail her character down.