Thor returns to Asgard to find Heimdall gone and his brother Loki posing as Odin. After exposing Loki, Thor forces him to help find their father, and with directions from Stephen Strange on Earth, they locate Odin in Norway. Odin explains that he is dying and Ragnarök is imminent despite Thor's efforts to prevent it. He then reveals his passing will allow his firstborn child, Hela, to escape from a prison she was sealed in long ago. Hela was the leader of Asgard's armies, conquering the Nine Realms with Odin, but Odin imprisoned her and wrote her out of history after he feared that she had become too ambitious and powerful. Odin dies as Thor and Loki watch on, 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, she defeats its army and kills the Warriors Three. She then resurrects the ancient dead who once fought with her, including her giant wolf Fenris, and appoints the Asgardian Skurge as her executioner. Hela plans to use the Bifröst to expand Asgard's empire, but Heimdall sneaks in, takes the sword that controls the Bridge and begins hiding other Asgardians.