It’s easy to forget now, after more than a decade of box-office domination and pop-cultural saturation, that the Marvel Studios machine was once filled with characters who could have looked ridiculous in live-action if the tone, casting, or filmmaking had been even slightly off. Robert Downey Jr. obviously knows something about that, having helped launch the MCU with “Iron Man” in 2008. But according to the actor, two other Marvel heroes presented especially difficult adaptation challenges: Chris Evans’ Captain America and Benedict Cumberbatch’s Doctor Strange.
Speaking with CBR, Downey reflected on which Marvel characters were the toughest to translate from the comics to the screen, and he pointed to Evans’ Steve Rogers and Cumberbatch’s Stephen Strange as the standouts.
“I still feel like the two hardest characters to pull off was what [Chris] Evans did with Cap,” Downey said. “And then, I think, [Benedict] Cumberbatch with Strange was like, ‘Are they really going to?’ Because in the comics, it works. And they were holding these spaces of credibility in the real world, and credibility in the world of magic and sorcery.”
It’s not hard to see his point. Captain America could have easily become a stiff, corny relic of old-fashioned jingoistic patriotism, especially in a franchise that initially leaned on Downey’s snarky, self-aware Tony Stark to set its house style. Instead, Evans helped turn Steve Rogers into the MCU’s moral center, giving the character sincerity without turning him into a punchline. By the time “Captain America: The Winter Soldier” and “Captain America: Civil War” rolled around, the character had become one of Marvel’s most durable dramatic anchors.
Doctor Strange presented a different kind of challenge. The MCU had played with gods, super soldiers, alien invasions, and advanced technology before Cumberbatch’s arrival, but “Doctor Strange” pushed the franchise fully into mysticism, alternate dimensions, spells, and sorcery. That material works naturally on the page, but in live-action, it needs an actor capable of grounding the absurdity without sanding off the strangeness. Cumberbatch’s clipped arrogance and dry wit made Strange feel like a cousin to Tony Stark, but his world opened the MCU up to a much weirder visual and narrative vocabulary.
Downey’s comments also arrive as he prepares for his own high-wire Marvel return. After Tony Stark’s death in “Avengers: Endgame,” Downey is set to rejoin the franchise as Victor Von Doom, aka Doctor Doom, in “Avengers: Doomsday.” It’s a casting decision that has already generated plenty of debate, not least because Downey remains so closely associated with Iron Man. But if anyone understands how easily a Marvel character can collapse under the weight of expectation, it’s probably the guy who helped make the entire enterprise credible in the first place.
“Avengers: Doomsday” is directed by Anthony Russo and Joe Russo and is currently set to open in theaters on December 18, 2026.
