Uther Pendragon has become King. He takes the wife of the Duke of Cornwall and they have a son Arthur. But Arthur has to be surrendered to Merlin. Arthur's half sister Morgan is sent to a nunnery. Years pass and Morgan has discovered she has powers and escapes from the nuns. Arthur resents having to take lessons. He meets Morgan by chance, they argue and she curses him. Uther has died and then to everyone's surprise Arthur pulls the sword Excalibur from a stone.