Malekith

Played by Christopher Eccleston

Malekith is the leader of the Dark Elves of Svartalfheim, an ancient enemy of Asgard who sought to use the reality-warping power of the Aether to plunge the Nine Realms into eternal darkness during a rare planetary alignment. Defeated and left for dead millennia earlier, he was awakened by the Aether's re-emergence and returned to finish what he started, only to be killed by Thor and Jane Foster. Read more →

First turns up in Thor: The Dark World.