No, Doctor Doom Is Not a Tony Stark Variant-Russo Brothers Reveal Doom's True Origins The Russo brothers have debunked the prevailing theory that Doctor Doom is a Tony Stark variant or that Tony was a Doom variant, stating that Doom is a distinct, original character with no direct connection to Stark's legacy. This suggests the movie will explore Doom's backstory independently of the Avengers' past events. Few questions currently have MCU fans' attention more than what Doctor Doom's backstory is going to prove to be in Avengers: Doomsday. In all honesty, Doom's history probably wouldn't be that significant a focus, had Robert Downey Jr. not been cast to play the villain. Sure, it would have been interesting to see how the MCU interpreted this fan-favorite character, but that would have felt similar to just about any Marvel character that has come before; it wouldn't have been the massive mystery that it is now. In part, that is by nature of the fact that there certainly has to be some sort of explanation.Perhaps part of that explanation just boils down to exactly this effect on fans' interests in the movie because of the casting choice, but it would be truly bewildering if Marvel didn't include some sort of link between Tony Stark and Victor von Doom.