Avengers: Doomsday Trailer Debuts at Comic-Con July 25, Confirming Robert Downey Jr. as Doctor Doom

Marvel's full Avengers: Doomsday trailer premieres exclusively in Hall H at San Diego Comic-Con on July 25, 2026, before going online that evening. Entertainment Weekly confirms the footage shows Robert Downey Jr. as Doctor Doom — not Tony Stark — the villain role Marvel announced at SDCC 2024. The Russos direct; the film opens December 18, 2026.