Joe Russo Insists Doctor Doom Shares Nothing in Common with Iron Man Despite Robert Downey Jr.’s Return in ‘Avengers: Doomsday’

Robert Downey Jr.’s casting as Doctor Doom remains one of the most jarring creative swings in Marvel history, and fans have spent well over a year trying to parse exactly what it means for the actor to trade Tony Stark’s arc reactor for Victor von Doom’s mask. That speculation has only intensified as ‘Avengers: Doomsday’ inches closer to its theatrical release.

Director Joe Russo has consistently pushed back against the assumption that Downey’s new villain is simply a reskinned version of his most famous MCU character. The filmmaker has framed ‘Avengers: Doomsday‘ as a genuine creative reset for the franchise, describing the film in past interviews as pushing the MCU back to what he’s called “Phase Zero,” a chance to start over without leaning too heavily on established continuity.

That messaging continued recently when Russo addressed the connection between the two characters directly, insisting Doctor Doom carries zero similarities to Iron Man despite the shared actor bringing both roles to life. It’s a notably firmer stance than some of his earlier comments, where he and co-director Anthony Russo had suggested the overlap between Downey’s two characters would “all make sense” once the film actually arrives in theaters.

That shift in messaging comes after months of fan speculation connecting the two roles, fueled partly by marketing materials that have placed Iron Man and Doctor Doom imagery side by side. Some theories have proposed that Downey’s Doom could be a multiversal variant of Tony Stark, pulled from an alternate timeline where his story took a darker turn, while others believe the connection may be purely coincidental casting rather than an intentional narrative link.

Russo has previously praised Downey’s approach to building out the character from scratch, noting that the actor became deeply immersed in developing Doom’s backstory and even contributed ideas for his costume design. According to Russo, Downey treated the role as an opportunity to create a rich, three-dimensional villain entirely separate from the legacy of the hero who helped launch the MCU back in 2008’s ‘Iron Man.’

The directors have also spoken about the emotional weight of hearing Downey’s take on Doom’s voice for the first time, with Joe Russo comparing the moment to the significance of Tony Stark’s iconic “I am Iron Man” line from ‘Avengers: Endgame.’ That comparison suggests the character’s debut is being treated as a genuinely pivotal moment for the franchise rather than a nostalgic callback.

Despite Russo’s insistence that Doom stands apart from Stark, not every fan has been convinced by that framing, with some pointing out that casting one of the MCU’s most recognizable actors as its next major villain inherently invites comparison regardless of how the story ultimately handles it. That tension between marketing messaging and audience skepticism has followed the project since Downey’s casting was first revealed at San Diego Comic-Con.

With ‘Avengers: Doomsday’ set to open in theaters on December 18, fans won’t have to wait much longer to see exactly how Russo’s claims hold up once the film’s full story finally unfolds. Whatever connection does or doesn’t exist between Stark and Doom, Marvel appears determined to keep audiences guessing until the very last possible moment.

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