So, Is Robert Downey Jr. In Fantastic 4
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Yes, Robert Downey Jr.'s Doctor Doom is in The Fantastic Four: First Steps – kind of. In the second post-credits scene, while Sue Storm is distracted getting a book for Franklin, something strange happens offscreen. When Sue returns, Franklin is accompanied by a mysterious figure in a green cloak, who has somehow entered the Baxter building.
Kevin Feige's plan to replace Kang the Conqueror with Doctor Doom in the MCU was in the planning stages for a lot longer than anyone knew.