During the reign of the Vikings, a man from another world crash-lands on Earth, bringing with him an alien predator. The man must fuse his advanced technology with the weaponry of the vikings to fight the monster.

A prequel to the first two Underworld films, this fantasy explains the origins of the feud between the Vampires and the Lycans. Aided by his secret love, Sonja, courageous Lucian leads the Lycans in battle against brutal Vampire king Viktor. Determined to break the king's enslavement of his people, Lucian faces off against the Death Dealer army in a bid for Lycan independence.