The fact that Robert Downey Jr. returns to the Marvel Cinematic Universe as Doctor Doom is in itself shocking. After all, he was the MCU; the heart, the wit, the sacrifice, for over a decade.
However, there is a twist to this: Downey has already provided us with a preview of how he appears as a villain. And it happened ten years ago. Before ‘Avengers: Doomsday’ was even a thought, Downey’s Tony Stark momentarily crossed a boundary between heroes and left audiences in a state of deep confusion.
MCU Already Showed Robert Downey Jr. As An Antagonist

In ‘Captain America: Civil War’, the Avengers did not engage in a battle against aliens or rogue AIs. They were fighting each other. The Sokovia Accords divided the team into two groups: Team Iron Man and Team Captain America. Stark, burdened with the guilt of the devastation in Sokovia, took an authoritarian stance.
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He believed that heroes required supervision, regulation, and responsibility by all means. His argument was sensible on paper. Emotionally? It spiraled. In the last act of the film, Stark was not only arguing about policy, but he was also on the hunt to kill Bucky Barnes after learning that the Winter Soldier had killed his parents under the Hydra regime.
Grief consumed logic. Friendships shattered. The last battle between Stark and Steve Rogers was crude, bitter, and excruciatingly human. Tony Stark was the villain for the first time. And that’s why Downey’s casting as Doctor Doom isn’t as out-of-left-field as it seems.
Why RDJ As Doom Makes Sense

With the MCU’s multiverse now firmly established, speculation is swirling that Doom could be a dark Iron Man variant, a Stark who made one catastrophic choice and never turned back. The preparation has already been made. We have witnessed the extent to which Tony can go when ego and guilt are in charge.
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However, even though Doom is not a direct variant, the history of the franchise provides Downey with a certain advantage. He knows the DNA of the MCU better than almost anyone. From ‘Iron Man’ to ‘Avengers: Endgame’, he bore the emotional storyline on his shoulders. This is why this comeback is not just a stunt casting but rather a calculated evolution.
Downey does not merely bring brilliance and charm; he also personifies obsession, regret, and moral complexity. Doctor Doom requires all that and more. Should ‘Doomsday’ lean towards that intensity, audiences may not just see a new villain. They may see what happens when a hero’s darkest instincts finally win.
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