Thanos

Played by Josh Brolin

Thanos is a Titan warlord obsessed with restoring cosmic balance by eliminating half of all life in the universe, a belief rooted in watching his own homeworld collapse from overpopulation. Immensely strong even without augmentation, he spent decades gathering the six Infinity Stones by force and diplomacy alike, eventually assembling the Infinity Gauntlet to carry out his plan on a universal scale. Read more →

First turns up in The Avengers.