- The title music is the slow version of the theme as used in the previous episode.
- The 1940 Commander Traynor refers to the “Ministry” when he really means “the War Office”.
- The end credits roll over a plain black background.
“Liz and Simon’s bewilderment increases. Why is England suddenly at war? Why are they being treated like spies and, worst of all, why does the naval rating who arrested them look so terrifyingly familiar?”
Cast & Crew
Cheryl Burfield (Liz Skinner)
Spencer Banks (Simon Randall)
Denis Quilley (Traynor)
Iris Russell (Jean Skinner)
Derek Benfield (Skinner)
John Alkin (Frank)
Sandor Eles (Gottfried)
Paul Humpoletz (Graz)
Kenneth Watson (Dr. Fordyce)
Virginia Balfour (Alice Fortune)
Sally Templer (Sarah)
Hilary Minster (German Sailor)
Written by Bruce Stewart
Script Editor Ruth Boswell
Scientific Advisor Geoffrey Hoyle
Designer Gerry Roberts
Producer John Cooper
(Director John Cooper: uncredited)
ATV Midlands – Monday 9th October 1970