When the demon-god Loki attacks Valhalla and kills Odin, Odin's son Thor must escape to the earth-realm of Mitgard (modern-day Los Angeles). Bent on the destruction of earth, Loki descends upon Los Angeles with an army of Garmr (monstrous, man-eating dogs). With the help of Jarnsaxa, Thor's guardian demigoddess, he races to find the Hammer of Invincibility in order to stop Loki. In this epic battle for heaven and earth, only one god will be left to rule all.