As a baby, young Arthur is entrusted to a lord by the great enchanter Merlin to raise him as his own son. Where does the baby come from ? Who are his real parents ? No one knows. Years later Arthur, now the squire of his adoptive brother Keu, tries to find a new sword for the young knight who forgot his own weapon right before a tournament. Finding an old sword set in a great stone on the top of a hill, Arthur pulls it out. He has no idea he just got his hands on Excalibur, the sacred sword only to be held by the future King of Britain.