Odins once trusted advisors, the ravens Huginn and Muninn are thrown out of the Gods realm of Aasgard and down to Midgard. In desperation, they decide to seek out Tor who is last seen touring Midgard with his sister Loki, and steal his hammer to use it to get back home. But the fierce jotuns led by the avengful Mime also want to get hold of the mighty hammer to avenge their defeat by the Gods.