Plot (Thor: The Dark World)

Official Synopsis

Thor: The Dark World continues the big-screen adventures of Thor, the Mighty Avenger, as he battles to save Earth and all the Nine Realms from a vengeful enemy that predates the universe itself. In the aftermath of Marvel's "Thor" and Marvel's "The Avengers," Thor fights to restore order across the cosmos...but an ancient race led by the powerful Malekith the Accursed returns to plunge the universe back into darkness. Faced with an enemy that even Odin and Asgard cannot withstand, Thor must embark on his most perilous and personal journey yet, one that will reunite him with Jane Foster and force him to sacrifice everything to save those he loves. via Marvel