SAN DIEGO – Directors Anthony and Joe Russo have revealed that Robert Downey Jr.’s performance as Doctor Doom impressed them from the moment they heard the character’s voice, saying it confirmed he was the perfect choice for Avengers: Doomsday.
Speaking to People during San Diego Comic-Con 2026, the filmmakers said they had already been confident in Downey’s casting. However, hearing the Oscar-winning actor perform Doctor Doom’s distinctive voice convinced them they had made the right decision.
Anthony Russo said the surprise came during an informal conversation while discussing different aspects of the character, including how Doctor Doom should sound behind his iconic mask.
According to Anthony, Downey unexpectedly began speaking in the character’s voice, leaving the filmmakers immediately convinced that they had found the definitive version of Marvel’s legendary villain.
How is Doctor Doom’s voice?
Joe Russo described the moment as unforgettable, saying the performance gave him “chills.” He compared it to one of Downey’s most memorable scenes as Iron Man in Avengers: Endgame, when Tony Stark delivered the now-famous line, “I am Iron Man,” before sacrificing himself to defeat Thanos.
Joe said Downey has a unique ability to create cinematic moments that remain with audiences long after the credits roll, adding that the Doctor Doom voice felt like another defining performance.
Marvel Studios has kept many story details of Avengers: Doomsday under wraps, but anticipation surrounding the film continues to grow, with Downey’s return to the Marvel Cinematic Universe in a completely different role generating significant excitement among fans.
Key points:
- The Russo brothers said Robert Downey Jr.’s Doctor Doom voice instantly convinced them he was the right choice.
- Anthony Russo revealed Downey surprised them by performing the voice during a discussion.
- Joe Russo said hearing the performance gave him “chills.”
- Joe compared the moment to Downey’s iconic “I Am Iron Man” scene in Avengers: Endgame.
- The directors discussed the experience during San Diego Comic-Con 2026.
- Avengers: Doomsday is one of Marvel Studios’ most anticipated upcoming films.
