Avengers directors Joe and Anthony Russo are keeping schtum about the plot circumstances surrounding Robert Downey Jr's Doctor Doom role, but they have teased a one-of-a-kind performance from the one-time Iron Man actor.

Avengers: Doomsday directors, the Russo brothers, are teasing new details about Robert Downey Jr.'s highly anticipated return to the Marvel Cinematic Universe. Downey Jr. will be back in action in the next Avengers movie.

The MCU was created when Robert Downey Jr. ’s Tony Stark came on the scene and proclaimed “I am Iron Man,” in the final moments of his Marvel debut film, which was a huge hit in the box office and the running start to the greater universe of superheroes we know now.