A new Avengers: Doomsday rumor suggests Robert Downey Jr., returning to the Marvel Cinematic Universe as Doctor Doom, will target Steve Rogers — not out of pure villainy, but to fix a multiversal catastrophe Rogers allegedly caused. The claim comes from industry insider MyTimeToShineHello, who says Rogers’ decision in Avengers: Endgame to remain in the past with Peggy Carter disrupted the prime timeline, triggering incursions across the multiverse.
When Steve Rogers went back in time to live with Peggy Carter, he reportedly created the incursions.
— Marvel Updates (@marvel_updat3s) August 13, 2025
Doctor Doom reportedly wants him dead in ‘AVENGERS: DOOMSDAY’.
(Via: MyTimeToShineHello) pic.twitter.com/GXX9o7o7kD
According to the theory, when Rogers returned the Infinity Stones and then stayed in the past, he altered history in ways that reshaped global events and spawned unstable realities. In this altered timeline, Tony Stark may never have become Iron Man, paving the way for a Doctor Doom — played by Downey Jr. in a dramatic role reversal. Fan theorist LollipopChainsawZz expanded on this idea, noting that Rogers’ life with Peggy could have set off a cascade of changes that fractured the multiverse.
Directed by the Russo Brothers, Avengers: Doomsday hits theaters on December 18, 2026, followed by Avengers: Secret Wars in 2027. Marvel has kept plot specifics under wraps, but trusted scooper Alex Perez of The Cosmic Circus describes Doom as believing he is “the hero in this story,” acting to seal the cracks in reality by using Franklin Richards, one of Marvel Comics’ most powerful characters. Perez also hinted at a possible “Team Doom,” though whether this involves other villains, variants, or Doombots remains unknown.
This rumored plot sets the stage for a high-stakes confrontation between two of the MCU’s most iconic figures, with Downey Jr. now steering the narrative much like Josh Brolin’s Thanos in Infinity War. Whether this marks Marvel’s bold reinvention or a final reckoning for its heroes, Avengers: Doomsday promises to reshape the MCU’s legacy — one Avenger at a time.
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