Louis Jourdan as Richard Stuart

Mary Tyler Moore as Elizabeth Sutton

Wilfrid Hyde-White as Dr. Ralph Sawyer

Stanley Holloway as Caretaker

Alexander Knox as Sir Howard Nettleton

Terence Alexander as Peter Martin

Ronald Howard as Insp. Huntington

Laurence Naismith as Lord Dunnsfield

Norman Bird as Sgt. Hooper

Ernest Clark as Chairman

Bernard Archard as Business Spokesman

Nora Nicholson as Miss Abernathy

Jean Anderson as Sister Teresa

Elspeth March as Mrs. Doyle

Geoffrey Cheshire as Navvy

Hilary Pritchard as Peter Martin's Secretary

Hugo de Vernier as Charles

Norma West as Nurse

Arnold Diamond as Swiss News Agent

Timothy Kendrick as Roger

William Burleigh as Brandon

Geoffrey Frederick as Policeman in Richard's Flat