Excalibur

Necromancer Merlin (Nicol Williamson) offers the magic sword Excalibur to the warlike Uther Pendragon (Gabriel Byrne) in exchange for a promise that he'll make peace with his enemy, the duke of Cornwall (Corin Redgrave). He agrees but breaks his word after catching sight of Cornwall's wife, Igraine (Katrine Boorman). With the magician's help he makes love to the woman in the guise of her husband. She bears a child, Arthur, who is taken by Merlin as payment for his assistance and left in the care of Ector (Clive Swift). Years pass, and the boy, now a humble squire, pulls Excalibur from the stone in which Uther had sunk it--a task no other could accomplish. With Merlin's counsel, he marries the stunning Guenevere (Cherie Lunghi), finds a champion in Sir Lancelot (Nicholas Clay), subdues the skirmishing knights, and builds the Round Table to unite them. Yet his half-sister, Morgana (Helen Mirren), lurks in the shadows, preparing to poison her brother's reign. (official distributor synopsis)