Marvel Teases Sentry’s Unmatched Power Against RDJ’s Doctor Doom

Once celebrated for his unwavering morality, a certain hero has now fallen from grace. Robert Downey Jr. is gearing up for a dramatic comeback in Avengers: Doomsday, but this time, the universe’s former savior is stepping into the shoes of Doctor Doom. In a recent Reddit post, fans caught a glimpse of official Marvel Studios artwork featuring Sentry —also known as The Void, or simply Bob. This reveal has sparked intense speculation, especially since the character, who made waves in Thunderbolts* , is set to appear in the next big Avengers installment.

Unleashing Sentry: Marvel’s Most Formidable Force

Expectations are sky-high for both the film and Sentry’s role. This character isn’t just another super-powered being—he’s practically a god, capable of outshining even Thor and Hulk. With the power of a living sun inside him, Sentry could make Doctor Doom look insignificant by comparison. But there’s a twist: Sentry’s mental health struggles mean that when his darker side takes over, he becomes even more unpredictable. In those moments, Doctor Doom might not stand a chance—one encounter could leave Doom as nothing more than a shadow of his former self.

Still, Doctor Doom is no ordinary adversary. His cunning and manipulative nature make him a psychological threat, able to twist minds with nothing but his words. He’s the kind of villain who can get under your skin and turn your own thoughts against you.

The Void’s Arrival: A Game-Changer for the Avengers

Whether Sentry appears as the heroic figure born from a failed experiment or as his terrifying alter ego, The Void, both personas are nearly unstoppable. This marks a significant shift for the franchise. In the Infinity Saga, Captain Marvel was introduced as a powerhouse, but her role was limited to a late-game appearance. Similarly, Spider- Man was used as a supporting player in Captain America: Civil War.

Looking at Sentry’s comic book history, it ’s possible he’ll be introduced late in the film, with his true abilities unleashed only at the climax. That doesn’t mean Bob will be absent from the story—he may play a key part in the buildup, with his full power revealed when it matters most. His ultimate form and impact remain a mystery, but it’s likely he’ll be a major player in Secret Wars, potentially as one of the fiercest warriors in Battleworld.

Doctor Doom’s Plan: Turning The Void Into a Weapon

Recent films have introduced the concept of variants, so it’s not a stretch to imagine an Iron Man variant. In this scenario, Tony Stark’s alternate self is Doctor Victor von Doom—a billionaire who ventures into space and becomes aware of the multiverse’s impending collapse. He’s not a villain in the traditional sense, but someone willing to make impossible choices to save reality, even if it means sacrificing entire timelines and keeping only the strongest survivors.

Armed with both magic and technology, Doctor Doom is poised to resurrect The Void, ensuring Bob’s presence remains intact to battle the universe’s greatest threats. Hints of this plan have already surfaced in the post-credits scene of The Fantastic Four: First Steps, where Doom appears to be assembling a team of the most powerful beings.

What do you make of these theories? Share your thoughts in the comments. Avengers: Doomsday is scheduled to hit theaters on December 18, 2026.