Marvel Theory Explains Everything About Robert Downey Jr.'s Doctor Doom

1 week ago 18

Robert Downey Jr as Tony Stark from Avengers Endgame

Published Feb 19, 2026, 9:40 PM EST

Jordan Iacobucci has been an avid reader and movie fan since childhood. Jordan is known among his friends as the Marvel and Star Wars nerd, and even wrote a thirty-page college dissertation about Spider-Man! He has been a staff writer at both Screen Rant and CBR, where he enjoys sharing his love for pop culture with the world.

Doctor Doom may be hiding a dark secret in Avengers: Doomsday, according to a new fan theory. Ten months before the new Marvel Cinematic Universe hits theaters, new rumors may finally explain why Tony Stark actor Robert Downey Jr. is playing the Multiverse Saga's big bad.

In a Reddit post exploring the massive ramifications of Downey's casting as Doctor Doom, user Electrical-Status-40 questions whether there could be dark magic behind the villain's appearance in Avengers: Doomsday. They put forth the theory that Doctor Doom is merely using the "dreamwalking" technique introduced in Doctor Strange in the Multiverse of Madness to control Tony Stark from across the multiverse.

In the MCU, dreamwalking is the act of projecting one's consciousness into the body of a variant of oneself from another reality. Wanda Maximoff uses this technique in Multiverse of Madness to attack the Illuminati of Earth-838. Doctor Strange later puppeteers a deceased version of himself in the final battle. The above Reddit theory suggests that Doctor Doom has grown powerful enough to project his consciousness into anyone he wants, and has chosen Tony Stark as his vessel, perhaps knowing that it would throw the Avengers off their guard.

This would be a massive twist that would undoubtedly prove incredibly controversial for Marvel fans. While it could adequately explain why Robert Downey Jr. is returning in the upcoming Avengers film, it might be too much for fans who only want Marvel to honor Tony Stark's memory after his heroic death in Avengers: Endgame. For now, however, this theory remains firmly rooted in the realm of speculation.

Is the Doctor Doom Dreamwalking Theory True?

Doctor Doom becomes the Sorcerer Supreme in Marvel Comics

There is some support for this theory in that Doctor Doom is confirmed to be a sorcerer in the MCU, as he is often portrayed in the comics. He would most likely have the power to dreamwalk, and thus could be controlling Tony Stark's body from another universe entirely (perhaps Earth-828, the home of the Fantastic Four).

There are also some problems with the dreamwalking theory. Most notably, there is no evidence to suggest that someone can dreamwalk into a body of anyone they choose. Thus far, individuals who dreamwalk can only control the bodies of their own variants. Even if this were possible, it would be too powerful an ability, as there would be nothing to stop Doctor Doom from puppeteering all of the Avengers to make sure they don't interfere with his plans.

It is also possible that the Doctor Doom of Avengers: Doomsday is indeed a Tony Stark variant who dreamwalks into other universes, including Earth-616, to cement his control over the universe. This would explain why Robert Downey Jr. had to return in the upcoming Avengers film and still allow for another version of Doctor Doom to appear in the MCU in later projects.

While fans still have countless theories about Robert Downey Jr.'s Doctor Doom, they most likely won't get any answers until Avengers: Doomsday finally hits theaters at the end of the year. The character has yet to appear in any promotional material (save for a single poster depicting his armor, pictured above), including any of the four teasers released earlier this year, suggesting that Marvel wants to keep all details about Doom secret for the time being.

Avengers: Doomsday will open in theaters on December 18, 2026.