Page "Out of the Unknown" Paragraph 1

The first three years were exclusively science fiction, but that genre was abandoned in the final year in favour of horror / fantasy stories.

A number of episodes were wiped during the early 1970s, as was standard procedure at the time.

A large number of episodes are still missing but some do turn up from time to time ; for instance, Level Seven from series two, originally broadcast on 27 October 1966 was returned to the BBC from the archives of a European broadcaster in January 2006.