TMDb/Avengers: Doomsday Movie Avengers: Doomsday unites heroes across the MCU multiverse. The Russos direct Robert Downey Jr. as Doctor Doom in this massive ensemble epic. April 21, 2026 AceShowbiz - Avengers: Doomsday is set to unite an unprecedented number of heroes from across the Marvel Cinematic Universe's multiple Earths. With a star-studded lineup featuring MCU veterans and returning favorites from the X-Men franchise, this highly anticipated film promises a vast ensemble cast and marks a major chapter in Marvel's ongoing Multiverse Saga. The film stars Robert Downey Jr.