After years away, Thor returns home to find that his father, Odin, King of Asgard, is missing. After finding him, he becomes aware of his older sister, Hela, the powerful and ruthless goddess of death. With Loki's help, he faces Hela, but during the battle, Thor ends up trapped on Sakaar, a planet on the other side of the universe. Now, he needs to race against time to return to Asgard and stop Ragnarok, the destruction of his world.