Malekith is the cruel leader of the Dark Elves, a race of beings said to be older than the universe itself. Born into darkness, Malekith led his people in a war against the Asgardians, Malekith wanted to use the Infinity Stone named the Aether for bring an end to the universe. but Bor the king of Asgard at the time had it taken away from him. with their defeat being inevitable. Malekith and the remaining Dark Elves escaped to space.
When Jane Foster was sucked into a vortex and the Aether entered her, Malekith reawakened and sought to claim the Aether to achieve his dark goals. He transformed his lieutenant, Algrim, into a Kursed. When Jane was taken to Asgard, Malekith led Dark Elves to attack. During the attack, many Asgardians were killed, including Frigga. Thor entered soon after and struck Malekith with lightning, burning half of his face. Malekith and Algrim escaped.
Later, Thor, Jane, and Loki traveled to Svartalfheim, intending to prevent more Asgardian casualties while destroying the Aether and Malekith. Loki seemingly betrayed Thor and cut his hand off to hand Jane over to Malekith, who extracted the Aether from her. However, Loki's betrayal was a hoax, and Thor tried to destroy the Aether, but it proved indestructible and Malekith absorbed it. Malekith escaped, although Algrim was killed by Loki.
Malekith, intending to destroy the entire universe, attacked Earth first. Thor fought Malekith, and in their battle they fell through various dimensional portals. In the end, Thor used some of Erik Selvig's devices to teleport Malekith's arms to Svartalfheim, commenting that although the Aether cannot be destroyed, Malekith can. Thor stabbed Malekith in the chest with the last device and smashed him against the wall of his ship, injuring him while teleporting him away. Malekith's ship nearly fell on top of Thor and Jane, but Selvig used his devices to teleport it to Svartalfheim, where it fell on top of Malekith and crushed him.
Current Version:
Malekith (Aether)
Former Version:
Malekith