"A variant (lifeboat saved) Thanos would see usurping God Emperor Doom’s power as a potential source of Infinity Gauntlet power. So they duke it out which would then be a cinematic reversal of the actors battle in Infinity War."

Robert Downey Jr. shocked fans everywhere when he revealed that he'd be coming back to the MCU - not as Iron Man, but as Dr. Doom.

Robert Downey Jr. returns to the MCU with other confirmed actors including stars Chris Hemsworth and Tom Hiddleston, 'X-Men' stars like Patrick Stewart and Ian McKellen, and a good chunk from the studio's 'Thunderbolts.