Roger "Red" Norvell; a mortal that was part of a documentary crew brought to Asgard by Loki, meets and falls in love with Lady Sif. Loki gives Norvell Thor's Iron Gauntlets and Belt of Strength to compete with Thor for Sif's affections, with neither realizing this was part of a master plan by Odin to create a surrogate God of Thunder to fulfill a prophecy and die fighting the Serpent of Ragnarok
When Thor finds the advance ship of an alien fleet out in space, it scans Thor and perceives him to be a threat. The ship revives Beta Ray Bill, who is in suspended animation. Bill battles Thor to standstill, until the ship reaches Earth's orbit, where one of the mystical enchantments of Thor's hammer Mjolnir comes into effect, being that Thor will revert back to his mortal persona of Donald Blake if separated from the hammer for more than sixty seconds. Blake is knocked unconscious by Bill, who examines Blake's cane and on striking the cane receives Thor's power and costume.
Odin creates a compromise by bestowing upon Bill a different hammer — Stormbreaker — which is equal in power to Mjolnir and was created by the same Dwarf.