After wanting to wage war against the Frost Giants, the mighty warrior Thora is cast out from Asgard by her father Odina and sent down to Earth. With no way home, and her hammer Mjölnir lost, Thora struggles to reclaim her powers. Meanwhile, on Asgard, Thora's devious sister Lokie had seized the throne and seeks to help the Frost Giants reclaim their glory. With help from scientist James Foster, Thora must learn the true virtue of being a hero and return home to stop Lokie and save Asgard from destruction.
