In Denmark, A.D. 507, the realm of King Hrothgar is threatened by the tormented demon Grendel that attacks the locals in their celebrations. The Danish king offers a reward for the death of the creature, attracting to Herot the brave Geat warrior Beowulf that seeks for glory. After a fierce battle, Beowulf defeats the demon and after receiving an old relic as reward, he finds his men slaughtered in the party saloon of the castle. King Hrothgar advises that the Grendel's mother was the responsible for the bloodshed and Beowulf chases her in the lake where she lives. The creature takes the form of a seductive woman and seduces Beowulf with a promise of becoming an invincible and wealthy king if he makes love to her and gives his golden relic to her. Years later, King Beowulf feels the aftermath of his sin