Beta Ray Bill, a heroic alien warrior chosen to wield the power of Thor, learns that Surtur, the fire demon of Muspelheim, threatens Asgard and other realms. Determined to stop him, Beta Ray Bill travels to Surtur’s fiery realm, Muspelheim, facing extreme heat, molten landscapes, and Surtur’s legions. There, he confronts the massive, demonic firelord in battle, testing his strength, courage, and worthiness, proving himself as a protector of the realms beyond just Asgard.