.Marvel is actually taking the Russo Bros. back to instruct the following pair of Avengers films The VergeRobert Downey Jr. Sets Wonder Rebound as Winner von Doom in 'Avengers: End Ofthe World' VarietyRobert Downey Jr. To Officially Go Back To The MCU As Doctor Ruin Forbes' Avengers' celebrity Robert Downey Jr. comes back to Marvel-- but as Doctor Doom U.S.A. TODAYMCU's Medical professional Ruin Designated finally for Avengers: End ofthe world, and It is actually Robert Downey Jr. |SDCC 2024 IGN.