About a race of alien robots that have conquered Earth and forced humanity underground. After 400 years, a small group of humans develop a plan to defeat the mechanical invaders in the ultimate battle between man and machine.

For ages, Odin has protected his kingdom of Asgard. But every winter, the All-Father must rest and regain his strength for one week. During this time, all of Asgard's foes (including trolls, giants, dark elves, and demons) try to claim the realm for their own, but they are always stopped by Odin's son, the mighty Thor, albeit with the loss of many brave Asgardian warriors. Loki, god of mischief, has kidnapped Dr. Bruce Banner and brought him to Asgard with the help of Amora, once Thor's lover, now the supervillain known as the Enchantress. Loki makes Banner angry and he changes into the Hulk. The Enchantress then casts a spell over the Hulk which separates Banner from his monstrous alter-ego and grants Loki control over the Hulk's body.

Hungry for adventure, Thor secretly embarks on the journey of a lifetime, joined by his loyal brother Loki, whose budding sorcery equips him with just enough magic to conjure up trouble, along with the Warriors Three - a band of boastful travelers reluctant to set sail on any adventure that might actually be dangerous. But what starts out as a harmless treasure hunt quickly turns deadly, and Thor must now prove himself worthy of the destiny he covets by saving Asgard itself.