Characters played by Donald Houston
Dr. David Caulder
Characters played by Ralph Bates
Dr. Michel Lebrun
Characters played by Fiona Gaunt
Dr. Helen Smith
Characters played by Barry Lowe
Tom Hill
Characters played by Cy Town
Technician
Characters played by Christine Bradwell
Ingrid
Characters played by Madhav Sharma
Rao
Characters played by Garrick Hagon
Bruno Ponti
Bruno Bertoli
Characters played by Peter Bathurst
Director General
Characters played by John Hallam
Dr. Peter Conway
Characters played by Tom Kempinski
Dr. Stephen Partness
Characters played by John Moreno
Juan Benavente
Characters played by Jonathan Sweet
Walters
Characters played by Mary Ann Severne
Sandy
Characters played by Robert La Bassiere
Cmdr. Bill Jackson
Characters played by Anne Rosenfeld
Lisa
Characters played by Patsy Trench
Jenny
Characters played by Victor Beaumont
Franz Hauser