First broadcast 7th March 1974.
The Special Branch team face an explosive situation when they are asked to find the thieves who stole a top-secret weapon fitted with a new laser device.
George Sewell ... Detective Chief Inspector Alan Craven
Patrick Mower ... Detective Chief Inspector Tom Haggerty
Paul Eddington ... Strand
Frederick Jaeger ... Cmdr. Fletcher
Ronald Radd ... Leonard Gosling
Dennis Waterman ... Frank Gosling
Ray Mort ... Ron Murray
Stephanie Turner ... Jean Gosling
Christopher Benjamin ... Dr. Eric Blyth
Edwin Apps ... Major Philip Erskine
Barrie Cookson ... Lemner
Lynn Dalby ... Carole Murray
Eric Mason ... Steve
Jonathan Elsom ... Koniev
Charles Farrell ... Harry
Julie Anderson ... Teresa
David McGillivray ... Ernie the Projectionist
