As of 2026, the Marvel Cinematic Universe is staring down one of its biggest what-ifs: Robert Downey Jr. returning as Victor von Doom in Avengers: Doomsday, slated for December 18, 2026. Directed by Anthony and Joe Russo, written by Stephen McFeely, Michael Waldron, Jack Kirby, and Stan Lee, and produced by the Russos and Kevin Feige, the film is shaping up to be a multiversal collision. Sam Wilson's Avengers, the Thunderbolts, Fox's X-Men, the Fantastic Four, and Wakandan representatives are all expected to converge. But if stopping Doom comes down to an epic final battle, raw power matters. Some heroes are simply out of their league; others can make Doom sweat. 
The Short List of Heroes Who Can Actually Challenge Doom
It is not exactly a secret that the bulk of Avengers: Doomsday's roster would struggle against Doom. Yelena Belova, Sam Wilson's Captain America, Steve Rogers, Cyclops, Nightcrawler, Human Torch, and plenty of others bring heart, tactics, and grit. But heart does not stop a sorcerer-scientist in a titanium alloy suit. Mr. Fantastic's ingenuity, Steve Rogers' leadership, and Wakandan technology could all play roles in a larger plan. Still, when the fists start flying, only a handful of characters have the raw power to trade blows with Doom.
| Detail | Info |
|---|---|
| Release Date | December 18, 2026 |
| Directors | Anthony Russo, Joe Russo |
| Writers | Stephen McFeely, Michael Waldron, Jack Kirby, Stan Lee |
| Producers | Anthony Russo, Joe Russo, Kevin Feige |
| Genres | Superhero, Action, Sci-Fi |
🧲 Magneto: The Master of Magnetism Has a Catch
One of Doctor Doom's contemporaries in Marvel Comics will be appearing in some capacity in Avengers: Doomsday. The archenemy of the X-Men, Magneto, will have some sort of role in the film. Played by Ian McKellen, he has been on both sides of Professor Xavier's X-Men team, so it is hard to say where he will fit into the picture. Like Namor, he has a history of both working with and against Doom, so a clash is feasible, whether it is a team-up with the heroes or a betrayal. 
On one hand, Magneto may seem like a secret weapon. Controlling metal is his primary super-power, and that is obviously something he could weaponize against Doom. If Doom does not count on Magneto's involvement, that is most certainly a viable way of defeating the heavily armored Doctor. However, comics have proven that Magneto's abilities are not a surefire method. Doom's armor is so advanced that he has reversed its magnetic polarity to prevent Magneto's powers from working on him. Theoretically, he could rely on the same tactic in Avengers: Doomsday.
🌊 Namor: The Sub-Mariner Could Get Close Enough to Strike
Of all the characters in Avengers: Doomsday, Namor the Sub-Mariner could very well have the easiest opening against Doctor Doom. After all, the Sub-Mariner is hardly a full-fledged superhero, and would therefore be someone Doom might consider partnering with. In addition to having an army at his command, Namor is one of the strongest people on the planet, and that is one reason why Doom holds him in high regard. 
Because their betrayals of each other are as frequent as their team-ups, there is a good chance they will end up coming to blows, possibly putting Namor in a position to use his amazing strength against Doom. He is indeed capable of doing Doom severe harm, but it is important to note that Doom, being the genius that he is, will likely be aware of Namor's weakness and have a plan for it in case they fight.
💥 The Thing: Pure Muscle Still Matters
As one of the physical powerhouses of the Marvel Universe, the Thing of the Fantastic Four has enough brute force to reckon with Doom as well. In the classic comics, the Thing has been vital to many of Doctor Doom's defeats, with his strength enabling him to land devastating blows on the villain. 
But in more recent decades, Doom has been significantly more resilient when it comes to dealing with simple raw power due to his increased use of magic and even more advanced technology in his armor. However, even with armor amplifying his strength, he is not usually in the same class as the Thing. Thanks to Doom's large arsenal, the Thing probably would not be able to beat him one-on-one in Avengers: Doomsday, but he could take a heavy hand in the fighting.
👻 Invisible Woman: The Deadliest Force Field in the MCU
Pure strength is not the only thing that can be effective against Doctor Doom. Despite lacking in that department, Sue Storm is one of Marvel's deadliest characters, a notion that Fantastic Four: First Steps does much to support. With her force fields, she accomplished a feat that would be unfeasible for the vast majority of Marvel characters, which was hurting Galactus. 
Anyone that can single-handedly pose a threat to the likes of Silver Surfer and Galactus is someone that should also concern Doctor Doom. This is reinforced by the comics, which have shown Invisible Woman using force fields to cut through his armor. If Doctor Doom fights the combined forces of the MCU's heroes, the Invisible Woman may be one of the first he seeks to eliminate. Provided he has the element of surprise, Doom could immediately take her out of the equation before she has a chance to deploy her force fields.
⚡ Thor: The God of Thunder Is Still a Top-Tier Threat
A character that is even more dangerous to Doom than the Thing is Chris Hemsworth's God of Thunder. What elevates Thor above the Thing in terms of threat level is that not only is he one of Marvel's heavy hitters, he also possesses one of its greatest weapons in Mjolnir and the ability to harness lightning. 
Doctor Doom, at his peak, can and has defeated Thor, but the reverse is also true. With all his power, Thor is more than capable of holding his own against Doctor Doom, and could overwhelm him in a one-on-one battle unless Doctor Doom finds an outside source of power, akin to his Emperor Doom state.
🛡️ Sentry: The Wild Card With a Dark Side
A relatively new addition to the MCU, Sentry, a.k.a. Bob Reynolds, is absolutely in a position to make a difference physically if Yelena's team goes toe-to-toe against Doctor Doom. True to his depiction in the comics, the MCU's Sentry has been recognized as one of the most dangerous forces in the world. 
Sentry possesses a multitude of abilities, making him the MCU's closest living equivalent to Superman in terms of sheer power. With his colossal strength, Sentry can trade blows with the strongest Marvel characters, including Thor and Hulk. That will make him an asset in fighting Doom, although to do so would come with the risk of unleashing the Void once more. The darker side of Sentry's persona is even more of a threat than Bob Reynolds, so much that it has even been theorized heavily that Sentry may be a pawn in Doom's plan in Avengers: Doomsday.
Final Thoughts: Doom's Genius Is the Real Boss Fight
The numbers game favors the heroes, but Doom is not a villain who loses to numbers. He is a sorcerer, a scientist, a monarch, and a strategist who has tangled with gods, mutants, and cosmic beings. The heroes who can actually hurt him are dangerous, but they also come with flaws. Magneto can be countered by armor polarity. Namor can be outmaneuvered. The Thing can be outclassed by magic. Invisible Woman can be ambushed. Thor can be drained or outpowered by an external boost. Sentry can become the Void. That is the beauty of Avengers: Doomsday as a showdown: it is not just a slugfest. It is a chess match where Doom may already be several moves ahead. If the MCU's heroes are going to stop him, they will need more than muscle. They will need teamwork, timing, and maybe a little luck. Otherwise, Doctor Doom might just prove why he is one of the greatest villains in Marvel history.