Stranger Things star David Harbour may have revealed a major plot detail for the upcoming Marvel film Avengers: Doomsday. In an interview with Variety, Harbour was asked to deliver a line of dialogue from the film out of context. He responded with a quote that fans interpret as confirmation of a significant story element.
Harbour, speaking in the Russian accent of his Red Guardian character, said, "You... are Tony Stark." This line suggests that Doctor Doom will be revealed to be an alternate version of Tony Stark, and that Red Guardian will be present for this reveal. The dialogue also serves as a callback to Robert Downey Jr.'s iconic "I am Iron Man" line, which were Tony Stark's last words in the MCU to date.
The revelation that Doctor Doom shares a likeness with Tony Stark has long been a subject of fan speculation, with some anticipating the reveal would be held for Avengers: Secret Wars. Harbour's seemingly premature disclosure of this dialogue is notable, as it is expected to be a pivotal moment in the film, likely eliciting shock from characters who were allies of Tony Stark.
The apparent reason for Doctor Doom resembling Tony Stark is tied to the multiverse. The MCU is reportedly establishing that Doom originates from a different reality than the primary 616 timeline, allowing for two versions of the same individual to exist. Doctor Doom's initial appearance was at the conclusion of The Fantastic Four: First Steps, and recent trailers for Doomsday suggest a prior connection between Sue Storm and a character known as Victor, who is presumably Doom.
While the exact path to Doom's ascension to his powerful persona remains unspecified, fan theories abound. The notes also briefly mention recent public stories concerning Harbour's personal life and his upcoming projects, including a new Netflix production with Millie Bobby Brown and a reported role in John Rambo.