Thor embarks on an adventure unlike any he has ever experienced: a search for inner calm. But his retirement is disrupted by Gorr the God-Slayer, a galactic killer who seeks the extermination of the gods. Thor enlists the assistance of King Valkyrie, Korg, and his ex-girlfriend Jane Foster, who, to Thor's amazement, wields Mjolnir, his mystical hammer, as the Mighty Thor. Together, they go on a perilous cosmic journey to unravel the secret behind the God Butcher's vengeance and stop him before he can wreak havoc.