Robert Downey Jr. Bulks Up for Dr. Doom Role in Avengers: Doomsday, Shares First Look from Set

Even with Avengers: Doomsday nearly a year from release, Robert Downey Jr. has already set social media abuzz. In a recently shared behind-the-scenes photo, the Oscar-winning actor is seen holding Jeremy Renner’s memoir My Next Breath, standing in front of his trailer—where a poster of Doctor Doom and a sign reading “Do Not Knock... Trust Yourself” is prominently displayed. The subtle clue has sent Marvel fans into a frenzy, seen as Downey’s quiet nod to his transformation from Iron Man to the iconic villain Doctor Doom.

Downey captioned the post: “Reading Renner’s book and feeling stronger already… what a journey to wisdom… very instructive… a must read!” Fans quickly picked up on the background details, with the Doctor Doom artwork fueling speculation about his new role in the MCU.

At 60, Robert Downey Jr. is embarking on a fresh superhero journey—this time on the darker side—as the enigmatic Doctor Doom. The casting surprise has been widely praised as a bold and transformative move for both Marvel and Downey himself. This shift marks a significant departure from his long-standing portrayal of Tony Stark and paves the way for a new legacy within the franchise.

While Marvel is keeping his full look under wraps for now, this low-key teaser photo has been enough to ignite excitement. Downey’s public support for Jeremy Renner, whose return as Hawkeye remains uncertain, also resonated with fans. The six-hour Avengers: Doomsday live cast reveal notably omitted Renner, but producers hinted not all cast members were present—keeping hope alive for surprise appearances.

As filming continues, Robert Downey Jr.’s quiet nod and Marvel’s tight-lipped approach have only intensified anticipation for what promises to be one of the MCU’s boldest chapters yet.