Avengers... assemble. That applause-attracting line was only one of the aspects that made the final battle of Avengers: Endgame one of the most iconic and epic battle scenes in film history. For one, it was amazing how EVERYONE joined in to fight the forces of Thanos alongside the Avengers and Guardians... or so we thought. Could there be some others who could have came through those portals and fought in the battle for the entire universe? There may be more than you might expect, as we look through everyone throughout the entire course of the Marvel Cinematic Universe. Cheers!