The mad Titan Thanos (a CG-rendered avatar of actor Josh Brolin), whose ambitious plans required the combined forces of all the Marvel heroes to defeat, has changed up his look once or twice. Here's the evolution of the character throughout the Marvel Cinematic Universe. There is one glaring omission here, which was the character's first appearance in the stinger for The Avengers, where he was portrayed in makeup by Damion Poitier.