Casting
Anton Diffring
Dr. Erik Leichner
William Sylvester
Vince Warren
Justine Lord
Diane Graydon
Martin Miller
Schroeder
Tony Garnett
Brennan
Warren Mitchell
Chemist
Philip Locke
Foster
Jacqueline Jones
Vanessa Palmer
Geoffrey Palmer
Dr. Tanfield
Sylva Langová
Vivienne Leichner
Peter Howell
Inspector Macready
Oliver MacGreevy
Wilkinson