.Wonder is actually carrying the Russo Bros. back to instruct the next pair of Avengers movies The VergeRobert Downey Jr. Sets Wonder Rebound as Winner von Ruin in 'Avengers: End Ofthe World' VarietyRobert Downey Jr. To Officially Go Back To The MCU As Doctor Doom Forbes' Avengers' superstar Robert Downey Jr. comes back to Wonder-- yet as Physician Doom U.S.A. TODAYMCU's Doctor Ruin Appointed at Last for Avengers: End ofthe world, and It's Robert Downey Jr. |SDCC 2024 IGN.