In a shocking twist, Robert Downey Jr. is set to return to the Marvel Cinematic Universe, not as Iron Man, but as the villainous Doctor Doom in the upcoming film 'Avengers: Doomsday'. This big reveal was made at San Diego Comic-Con, stirring excitement among fans. The film, set to release in May 2026, will be directed by the Russo brothers, famous for their work on 'Avengers: Endgame'.