Inside Robert Downey Jr's high-stakes push to revive Marvel with Avengers: Doomsday and Doctor Doom

As Marvel readies Avengers: Doomsday, Robert Downey Jr. takes on the franchise’s next big test: how to introduce Doctor Doom in the post-Endgame era.

Robert Downey Jr. is walking back into Marvel — but not as Tony Stark. He is suiting up as Doctor Doom in 'Avengers: Doomsday', which Marvel is clearly positioning as the next mega-crossover. And yes, he knows exactly how high the bar is after 'Infinity War' and 'Endgame '.

The bar Thanos set

Chatting with CBR in a conversation that zeroed in on 'Infinity War' and where Marvel goes from here, Downey basically said the quiet part out loud: a movie like this lives or dies on its villain.

"You're only as good as your bad guy."

He tied that directly to 'Doomsday', pointing to how 'Infinity War' worked because everyone had to measure up to Josh Brolin's Thanos. That movie was built around Thanos chasing the Stones while the Avengers largely scrambled to respond, and a lot of fans still credit Brolin's performance for making it one of Marvel's high-water marks. That is the kind of footprint Doctor Doom is expected to leave this time around — no pressure.

So what makes Doom different?

Unlike Thanos, who was carefully threaded through multiple projects before taking center stage in 'Infinity War' and 'Endgame', Doom shows up with decades of comic history and a reputation for being one of Marvel's most layered, complicated antagonists. Downey knows he is not just introducing a new bad guy; he is taking on a character many people expect to define the MCU 's next era — all while returning to the same universe that gave him one of the most famous farewells in blockbuster history.

And if you are wondering what Downey looks like shifting from quippy billionaire to Latverian monarch, his 'Doomsday' co-star Ebon Moss-Bachrach has teased him as "mischievous" and "unknowable." That tracks.

Downey’s approach: big-picture first

Downey also admitted that following two movies that rewired how event films are built is no small ask. Before he drills down on the performance, he tries to see the larger creative plan and look for the thing they have not nailed yet — the angle that makes this feel like a step forward, not a cover song. He says a lot of work has gone into making sure 'Doomsday' feels like a real evolution, and that the way the story is structured — plus how the characters collide — is doing the heavy lifting.

Marvel’s pivot — and the Russos weigh in

Complicating all of this is the Multiverse Saga shuffling behind the scenes. Marvel originally steered the arc around Kang the Conqueror; now 'Doomsday' has to plant Doom as the franchise ’s next defining threat while keeping the bigger narrative on track. Joe Russo backed up the scale of the challenge in the same discussion, saying 'Doomsday' and 'Secret Wars' have been especially tough precisely because expectations keep rising with every event film — and he called what is coming one of the most emotionally complex MCU stories he and Anthony have taken on.

Why the pressure is sky-high

• 'Avengers: Doomsday' is the next giant crossover, so it is automatically living in 'Infinity War'/'Endgame' territory.
• Thanos set a template: the villain drives the plot and the heroes scramble — Downey is openly framing Doom with that in mind.
• Doom is a legacy character with a fierce comic pedigree, which means fan expectations are already spiking.
• Marvel’s Multiverse Saga plans shifted from Kang to Doom, so this movie has to establish a new central big bad and keep the long game intact.
• Downey says the team focused on structure and character dynamics to make this feel new, not nostalgic.
• On the practical side, those 'Doomsday' suits were apparently so heavy the cast wound up wiped out on set — not exactly a chill shoot.

Where this lands is simple: 'Avengers: Doomsday' is not just another MCU chapter. It has to honor the legacy of 'Infinity War' and 'Endgame' while launching a new villain era and reminding everyone why these movies became cultural events in the first place. Whether Downey’s Doom becomes the next great Marvel antagonist is still up in the air, but based on what he is saying, everyone involved knows the stakes are massive.