"A physicist finds himself drawn into an investigation to track down a spy at his research station."
Marshall Thompson
as Dr. Cliff Mitchell
John Loder
as Major Anderson
Henry Oscar
as John Manning
John Stuart
as Dr. Warren
Anne Aubrey
as Jill Warren
Magda Miller
as Ruth
Murray Kash
as Waldo
Michael Mellinger
as Tony Norwood
Robert MacKenzie
as Dale
Tom Bowman
as Charles
Peter Elliott
as Syms
Bernard Archard
as Inspector
Shirley Thieman
as Shiela
Richard Gordon
Executive Producer
Ronald Kinnoch
Director
Brian Clemens
Screenplay
Producer
Albert Elms
Music
Peter Mayhew
Editor
George Frost
Makeup Artist
Doris Pollard
Hair Setup
Douglas Hermes
Production Manager
Bill Constable
Set Designer
Ernest Day
Camera Operator
John Winbolt
