Thor is on a quest to bring balance and peace to the cosmos when an ancient and vengeful race, led by the dark and ruthless Malekith, emerges with the intent to plunge the universe back into chaos. Faced with an adversary that even Odin and Asgard cannot defeat, Thor embarks on a dangerous, personal journey. Along the way, he reunites with Jane Foster and must confront the ultimate sacrifice to save the universe from certain destruction.