5th Century Britain. Rome's Legions have gone leaving chaos. Deposed King Vortigern flees to Wales, where he meets an ageless, inhuman youth sired by a demon. His name is Merlin and he foretells the coming of the true king, Uther, head of the Pendragon dynasty, who, with the vengeance in his heart and battle in his blood, will reunite the British Isles and drive the invaders back into a sea turned red with their blood; and how, when victory is in his grasp, his lust for another's wife will send it slipping from his hand, bringing chaos and anarchy, but also bringing into the world a son who will be the greatest hero of all time - King Arthur.