Thor: The Dark World

Eons ago, Bor, father of Odin, clashes with the Dark Elf Malekith, who seeks to unleash a weapon known as the Aether on the nine realms. After conquering Malekith's forces, including enhanced warriors called the Kursed, on their home world of Svartalfheim, Bor safeguards the Aether within a stone column. Unbeknownst to Bor, Malekith, his lieutenant Algrim, and a handful of Dark Elves escape into suspended animation.

In present-day Asgard, Loki stands imprisoned for his war crimes on Earth. Meanwhile, Thor, alongside warriors Fandral, Volstagg, and Sif, repel marauders on Vanaheim, home of their comrade Hogun; it is the final battle in a war to pacify the Nine Realms following the reconstruction of the Bifröst, the "Rainbow Bridge" between realms, which had been destroyed two years earlier. The Asgardians soon learn that the Convergence, a rare alignment of the Nine Realms, is imminent; as the event approaches, portals linking the worlds appear at random. Read more on Wikipedia.