Thor’s villainous brother Loki has escaped Asgard to search for Yggdrasil — The Tree of the Nine Realms. The tree holds the power of the Universe, and is secreted away on Earth. With the help of giant wolf god Fenrir, Loki plans to destroy the tree and replant it in his image, giving him dominion over all. Now Thor must follow Loki to Earth to wage an epic battle that will hold the two worlds in its balance.

Defeated on the battlefield by Thor, Loki is brought to Odin for justice. But by using his guile and trickery, Loki escapes to Earth. There he will conquer mankind and raise an even larger army to use in his quest for domination throughout the Nine Realms. Enraged by devastation of his home, Thor pursues Loki, but in the journey, he is rendered defenseless, awakening on Earth without his mighty hammer, or his memory. Alone and disoriented, Thor is besieged by Loki’s followers, hell-bent on stopping him…at any cost. Enlisting the help of a female human companion, Thor fights his way North, in search of his mythical weapon. Finding his hammer, Thor’s identity and prowess are restored and he must now prepare himself for a final climactic battle with Loki, to prevent the overthrow of the universe.

After his retirement is interrupted by Gorr the God Butcher, a galactic killer who seeks the extinction of the gods, Thor enlists the help of King Valkyrie, Korg, and ex-girlfriend Jane Foster, who now inexplicably wields Mjolnir as the Mighty Thor. Together they embark upon a harrowing cosmic adventure to uncover the mystery of the God Butcher’s vengeance and stop him before it’s too late.