James Mason

Sir Brack

Janet Leigh

Princess Aleta

Robert Wagner

Prince Valiant

Debra Paget

Ilene

Sterling Hayden

Sir Gawain

Victor McLaglen

Boltar

Donald Crisp

King Aguar

Brian Aherne

King Arthur

Barry Jones

King Luke

Mary Philips

Queen

Howard Wendell

Morgan Todd

Tom Conway

Sir Kay

Sammy Ogg

Small Page (uncredited)

Lucien Ballard

Director of Photography

Robert L. Jacks

Producer

Franz Waxman

Original Music Composer

Henry Hathaway

Director

Dudley Nichols

Screenplay

Robert L. Simpson

Editor

Buddy Van Horn

Stunts

Hal Foster

Characters

Frances C. Richardson

Researcher

Hilda Grenier

Technical Advisor