TMDb/Avengers: Doomsday Movie Robert Downey Jr. returns to the MCU as Doctor Doom. See the first official look at the iconic villain in Avengers: Doomsday. March 21, 2026 AceShowbiz - The upcoming Marvel Cinematic Universe (MCU) film Avengers: Doomsday, set for release in 2026, continues to generate significant excitement. A major highlight for fans is the announcement that Robert Downey Jr. will return to the MCU, not as his iconic Tony Stark/Iron Man, but in a surprising new role as the infamous villain Doctor Doom.