One star of Avengers: Doomsday has finally shed some light on how Robert Downey Jr. fits into the new MCU as Doctor Doom after playing Iron Man for so many years. 2021 introduced Simu Liu to the MCU via Shang-Chi and the Legend of the Ten Rings, which is well-regarded as one of the best movies in the Multiverse Saga. Liu is one of the names confirmed to reprise his role as Shang-Chi in Avengers: Doomsday, which will be released in theaters on December 18, 2026.