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
David Futcher
— Whitehead
Clifford Earl
— Sergeant
Derek Partridge
— Detective
Fred Beauman
— Policeman
Michael Moyer
— Policeman
Roland Curram
— Soldier