First Avengers: Doomsday Trailer Reveals Robert Downey Jr. as the Villain

Marvel's Avengers: Doomsday trailer debuts July 25, 2026, at San Diego Comic-Con, then goes online that evening. Entertainment Weekly confirms Robert Downey Jr. plays Doctor Doom — a villain, not his old hero Tony Stark. Marvel announced the casting at Comic-Con 2024. The Russos direct; the film hits theaters December 18, 2026.