Kirk Douglas as Robert Caine

Agostina Belli as Sara Golan

Simon Ward as Angel Caine

Anthony Quayle as Professor Griffith

Adolfo Celi as Dr. Kerouac

Romolo Valli as Charrier

Ivo Garrani as Prime Minister

Spiros Focás as Harbin

Massimo Foschi as Young Arab

Virginia McKenna as Eva Caine

John Carlin as Robertson

Alexander Knox as Meyer

Vittorio Fanfoni as First Asylum Patient

Eugenio Masciari as Second Asylum Patient

Sergio Serafini as Third Asylum Patient

Domenico Di Costanzo as Fourth Asylum Patient

Geoffrey Keen as Gynecologist

Allan Hendrick as Fanatical Demonstrator

Peter Cellier as Sheckley

Gerard Hely as Clarke

Caroline Langrishe as Girlfriend (as Caroline Horner)

Penelope Horner as Caine’s Secretary

Jenny Twigge as Air Hostess

Richard Cornish as 1st Journalist

Denis Lawson as 2nd Journalist

John Bancroft as 3rd Journalist

Joanne Dainton as Nurse