Marvel is doing everything it can to make sure Avengers: Doomsday has an unprecedented rollout. The trailers are kicking off with a bang, though: the long-awaited return of Chris Evans, once again playing Steve Rogers. Old Steve Rogers in Avengers: Endgame. One of the leading fan theories surrounding Avengers: Doomsday is that Steve Rogers’ return to the past caused an incursion, colliding different versions of the timeline together. Avengers: Doomsday premieres in theaters on December 18, 2026.