But if you need a close-to-definitive answer on who's "stronger" — it's Thanos. Doom, though clad in armor and a formidable scientist and sorcerer, is a human being.

Can Doctor Doom beat Thanos? It's an increasingly common question among Marvel fans, with Robert Downey, Jr.'s Doctor Doom ...

Robert Downey, Jr. is back in the MCU, incredibly enough, as Doctor Doom in Avengers: Doomsday. And really, there was no other choice to replace Kang the Conqueror.

For Downey Jr.’s Doctor Doom to unseat Brolin’s Thanos as the MCU’s best big bad, he must, first and foremost, distinguish himself from Iron Man.

Robert Downey Jr. is returning to the MCU as Doctor Doom, and he'll be joined by plenty of familiar faces, including the Fantastic Four, the Thunderbolts, and even a few X-Men.

3 Marvel Villains Who Could Have Replaced Thanos Better Than Doom Marvel Studios had plenty of options to offer a welcome change of pace after the Avengers defeated Thanos, instead of Doctor Doom.

4. Doom demonstrates his magical superiority over Kun Lun's own Sorcerer Supreme, Master Khan. 5. Combines Ceranda's magic with his own. 6. Can access the Dreamtime. 7.

But on Saturday, Marvel Studios President Kevin Feige surprised the crowd at San Diego Comic-Con when he announced Downey’s return to the Marvel Cinematic Universe — this time as Doctor Doom ...