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Two years after the battle of Sokovia,[a] Thor is imprisoned by the fire demon Surtur, who reveals that Thor's father Odin is no longer on Asgard. He explains that the realm will soon be destroyed during the prophesied apocalypse Ragnarök, once Surtur unites his crown with the Eternal Flame that burns in Odin's vault. Thor frees himself, defeats Surtur, and takes his crown, believing he has prevented Ragnarök. Thor returns to Asgard to find Heimdall gone and his estranged brother Loki posing as Odin. He forces Loki to help find their father.
With directions from Stephen Strange, they find Odin in Norway. Odin explains that he is dying, Ragnarök is imminent despite Thor's efforts, and his passing will free his firstborn child, Hela, from a prison she was sealed in long ago. Hela, a sibling Thor and Loki did not know existed, was leader of Asgard's armies and conquered the Nine Realms with Odin, but he imprisoned her and wrote her out of history after she became too bloodthirsty and did not share his views on peace.
Odin dies and Hela appears, destroying Thor's hammer Mjolnir. She pursues the two as they attempt to flee through the Bifröst Bridge, forcing them out into space. Arriving in Asgard, Hela defeats its army, slays the Warriors Three, and resurrects the ancient dead who once fought with her, including her giant wolf Fenris. She appoints the Asgardian Skurge as her executioner. Hela plans to use the Bifröst to expand Asgard's empire, but Heimdall takes the sword that controls the Bifrost. Thor crash-lands on Sakaar, a garbage planet surrounded by wormholes.