Marvel's upcoming film 'Avengers: Doomsday', set to release on May 1, 2026, will feature Robert Downey Jr. as the villain Doctor Doom, marking a significant transition from his iconic role as Iron Man. This return was announced at Comic-Con 2024, raising questions about how the character will be portrayed, especially in relation to the multiverse. Rumors suggest that Marvel plans to establish Doctor Doom as a formidable antagonist, potentially even more justifiable than previous villains like Thanos. Alongside Downey Jr., the cast includes notable names such as Peter Pascal as Reed Richards, Vanessa Kirby as Sue Storm, and Benedict Cumberbatch reprising his role as Doctor Strange. The film is part of Marvel's Phase Six and is expected to set the stage for future narratives, including a follow-up film, 'Avengers: Secret Wars'. As anticipation builds, the film's production is scheduled to begin in late 2025 under the direction of Anthony and Joe Russo.