Robert Downey Jr. has confirmed his return to the Marvel Cinematic Universe (MCU) as the villain Doctor Doom, during a surprise announcement at San Diego Comic-Con. Marvel Studios president Kevin Feige revealed that Downey will appear in the upcoming films 'Avengers: Doomsday' and 'Avengers: Secret Wars', directed by Anthony and Joe Russo. Downey, who originally portrayed Iron Man, humorously remarked, 'New mask, same task,' highlighting his affinity for complex characters. His return comes at a time when the MCU is looking to reinvigorate its franchise, which has faced recent challenges with box office performances. Feige noted the importance of Doctor Doom in the narrative and welcomed Downey as 'the greatest actor in the world' for the role. The announcement has generated significant excitement among fans, especially following the successful release of 'Deadpool & Wolverine'.