King Arthur (Mark Dignam) learns that one of his knights is plotting to take over and marry his daughter. Soon the soldiers of double-dealing Edmund of Cornwall (Ronald Howard) slay the king. However his daughter Katherine (Janette Scott) escapes with the help of outlaw Robert Marshall (Ronald Lewis). Claiming that Katherine is dead, Edmund prepares to usurp the throne in league with Saxon invaders. After coming close to death more than once at the hands of the sinister limping man, Katherine and Robert and other loyal countrymen rescue the great wizard Merlin (John Laurie) from the hands of Edmund's men to help them save Camelot and England. They arrive at Camelot just as Edmund is about to be crowned. On Merlin's advice, Robert challenges Edmund to kill him as a traitor, by using Arthur's sword Excalibur. Edmund is unable to draw the sword from the scabbard, whereupon Robert presents the sword to Katherine, the rightful heir, who draws it out easily. Katherine is recognised by the court as the new Queen. Following a battle against Edmund's remaining men and the invading force of Saxons, Katherine's armies prevail. She offers the lands of Edmund and other renegades to Robert, so that he can rule alongside her as King.
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