George Peppard as John Shay

Joan Collins as Sarah Booth

Judy Geeson as Polly Bendel

Oskar Homolka as Racovsky

Charles Gray as Vaughan Jones

Nigel Patrick as Colonel Scott

Keith Michell as Adam Booth

George Baker as Philip Crawford

Alexander Scourby as Prof. Parker

Peter Bull as Butterfield

Ernest Clark as Roper

Peter Dyneley as Balkov

Gisela Dali as Anna

Stefan Gryff as Shay Cell Group Surrvior

Steve Plytas as Poilce Inspector