The life story of King Arthur is chronicled. When Uther Pendragon was smitten with the Duke of Cornwall's wife, the magician Merlin helped him disguise himself as Cornwall, and Arthur was conceived. In his youth, Arthur did what no one else could do when he pulled the magical sword Excalibur from the rock in which Pendragon has lodged it. Arthur goes on to many successes: He marries the beautiful Guenevere, discovers the brave Sir Lancelot, and creates the Round Table, bringing together the knights who were previously fighting with each other. But Arthur's half-sister Morgana plots against him.