TMDb/Avengers: Doomsday Movie Doctor Doom rises as the Avengers' greatest threat in Doomsday. See his legendary Castle and face the Incursions. April 19, 2026 AceShowbiz - Avengers: Doomsday is set to introduce one of Marvel's most iconic villains, Doctor Doom, in a major new role as the movie's primary antagonist. While Doctor Doom made a brief appearance during the post-credits scene of Fantastic Four: First Steps, his presence in Avengers: Doomsday will be much more significant, with fans finally getting a detailed look at his legendary home, Castle Doom.