Cornel Wilde Sir Lancelot Director, Actor, Screenwriter, Producer Jean Wallace Guinevere Actor Brian Aherne King Arthur Actor George Baker Sir Gawaine Actor Archie Duncan Sir Lamorak Actor Adrienne Corri Lady Vivian Actor Michael Meacham Sir Modred Actor Iain Gregory Sir Tors Actor Mark Dignam Merlin Actor Reginald Beckwith Sir Dagonet Actor John Barrie Sir Belvedere Actor Richard Thorpe Sir Gareth Actor Joseph Tomelty Sir Kaye Actor Graham Stark Rian Actor Geoffrey Dunn Edrick Actor Walter Gotell Sir Cedric Actor Peter Prowse Brandagorous Actor Christopher Rhodes Ulfus Actor John Longden King Leodogran (uncredited) Actor Bob Bryan Sir Dorjak (uncredited) Actor Violetta Farjeon French serving maid (uncredited) Actor Richard Schayer Screenwriter Bernard Luber Producer Harry Waxman Cinematographer Frederick Wilson Film Editing Ron Goodwin Original Music Maurice Carter Art Director Terence Morgan Costume Design