Rhys Williams

as William Blake

Ron Randell

as Eric Hawkins

Valentine Perkins

as Betsy Blake

Doris Lloyd

as Elizabeth Blake

Lester Matthews

as Horatio Nelson

Harry Cording

as Sampson Edwards

Terry Kilburn

as Dick Savage

Maurice Marsac

as Phillipe Daumer

William Fawcett

as Shawn O'Donnell

Ross Elliott

as Howard Palmer

Don C. Harvey

as Moriarty

James Fairfax

as Oliver Sibley

Stanley Andrews

as Officer (uncredited)

Frank Ferguson

as Officer (uncredited)

Percy Helton

as Crewman (uncredited)