The trailer for 'Avengers: Endgame' was released on Friday.br Fans are asking why Brie Larson's Captain Marvel is not in the trailer.br Captain Marvel is supposed to save the day in 'Avengers: Endgame.'br So, why is she missing from the trailer?br ComicBook.com reports the Russo brothers purposefully kept Larson's Captain Marvel out of the trailers.br ---We want to save her reveal.--- Joe Russo said.br ---very important to us to commit... to this ending very hard.