Anthony Hopkins as Philip Calvert

Robert Morley as Uncle Arthur

Nathalie Delon as Charlotte

Jack Hawkins as Sir Anthony Skouras

Corin Redgrave as Hunslett

Derek Bond as Lord Charnley

Ferdy Mayne as Lavorski

Maurice Roëves as Lt. Williams - Helicopter Pilot

Leon Collins as Tim Hutchinson

Wendy Allnutt as Sue Kirkside

Peter Arne as Capt. Imrie

Oliver MacGreevy as Quinn

Jon Croft as Durran

Tom Chatto as Lord Kirkside

Charlie Stewart as Sgt. Macdonald

Edward Burnham as Macullum

Del Henney as Dungeon Guard

Bill Brandon as Thug (uncredited)

Harry Fielder as Thug on Boat (uncredited)

Martin Grace as Thug (uncredited)

Charles Gray as Sir Anthony Skouras (voice) (uncredited)

Prentis Hancock as Agent (uncredited)

Barrie Hesketh as Seaman (uncredited)

Bill Hibbert as Thug (uncredited)

George Leech as Thug (uncredited)