Robert Downey Jr. returned to the Marvel Cinematic Universe as a villain — and he wants fans to know the gamble is going to pay off. Speaking to CBR alongside co-director Joe Russo, Downey said Avengers: Doomsday, due in cinemas December 18, has “landed in a place” that will satisfy audiences, offering his most direct reassurance yet about a film carrying the weight of an entire franchise’s credibility.
The actor credited the film’s promise less to his own performance and more to its structural design and ensemble. “There’s something going on in ‘Doomsday’ and forward that is literally the only antidote to: How do you not have these films be let down after an ‘Infinity War’ and an ‘Endgame?’ And boy, have we labored long and hard to bring that down,” he said. Neither Downey nor Russo disclosed what that antidote actually is.
The stakes behind that vague confidence are considerable. Downey’s original MCU run closed with Tony Stark’s death in Avengers: Endgame in 2019, one of the most emotionally resonant moments in franchise history. In the years since, Marvel’s output has been uneven — Spider-Man: No Way Home and Deadpool & Wolverine delivered at the box office, while The Marvels and Ant-Man and the Wasp: Quantumania fell well short.
The road to Doomsday itself was rocky. Jonathan Majors, originally cast as the saga’s chief villain Kang, was fired in late 2023 following a criminal conviction. Marvel pivoted sharply, bringing back the Russo brothers as directors and announcing Downey’s return — this time as Doctor Doom — at San Diego Comic-Con in July 2024.
The film draws on an unusually wide cast, merging the core Avengers roster with the Fantastic Four and Fox’s legacy X-Men ensemble, a multiverse collision that has fueled considerable fan anticipation. Downey described his approach to absorbing that pressure by thinking like his directors. “I try to feel like I’m in the writing room,” he said. “But eventually, there are so many big shoes to step into that I just have to go, ‘What hasn’t been done as well as it can be done yet?'”
Russo echoed Downey’s confidence, calling Doomsday the most emotionally complex entry the franchise has produced. “And in a lot of ways, the most mature of all of them,” the director said. Early box office tracking, reported in March 2026, has been described as strong, with predictions that Doomsday could become the year’s highest-grossing film.
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Downey acknowledged the dual nature of the fanbase Marvel must satisfy — enthusiastic when the studio gets it right, unsparing when it doesn’t. “To still be engaging with people who are critical when we fall short, but who understand how difficult it is when we get it right,” he said.
