The series takes place from May 1940 to April 1945.
The series failed to become a success when shown in America.
Due to the high production costs of the series, the BBC pre-sold the series to "Universal TV" in the US, making it one of the BBC's first co-productions with another broadcaster.
Won awards for Top BBC Series and Top TV Series at the 1973 Sun Awards.
Simon Carter's wife Cathy (Joanna David) appeared in both Missing, Presumed Dead (1972) and Odd Man In (1974), making her the only female character to appear in more than one episode.