Kirk Douglas as Einar

Tony Curtis as Eric

Ernest Borgnine as Ragnar

Janet Leigh as Morgana

James Donald as Lord Egbert

Alexander Knox as Father Godwin

Maxine Audley as Enid

Frank Thring as Aella

Eileen Way as Kitala

Edric Connor as Sandpiper

Dandy Nichols as Bridget

Per Buckhøj as Bjorn

Almut Berg as Pigtails (uncredited)

Peter Capell as Minor Role (uncredited)

Bill Cummings as Viking Warrior (uncredited)

Kelly Curtis as Young Girl (uncredited)

Peter Douglas as Young Boy (uncredited)

Georges Guéret as Viking Warrior (uncredited)

Rico López as Viking Warrior (uncredited)

Marco Perrin as Extra (uncredited)

Paul Préboist as Extra (uncredited)

Orson Welles as Narrator (voice) (uncredited)