When King Uther Pendragon sets his sights on Gorlois' lovely wife Igraine, little does he realise the chain of events he will set in motion. The resulting battle sees Uther claim Igraine for his wife and fathers a son with her who will one day become a legendary ruler. But Gorlois' young daughter Morgan vows revenge on her father's murderer and enlists an unwitting Merlin to help her develop magical powers.