.Marvel is taking the Russo Bros. back to direct the next 2 Avengers movies The VergeRobert Downey Jr. Collections Marvel Return as Winner von Ruin in 'Avengers: End Ofthe World' VarietyRobert Downey Jr. To Officially Return To The MCU As Doctor Ruin Forbes' Avengers' celebrity Robert Downey Jr. goes back to Marvel-- however as Physician Ruin U.S.A. TODAYMCU's Physician Doom Appointed finally for Avengers: Doomsday, and It's Robert Downey Jr. |SDCC 2024 IGN.