Out of the Unknown (1971)
3.8 of 5 from 65 ratings
22h 5min
There is a mistake with the date on this series.It was first broadcast in 1965 not 1971. 26 episodes were made and it finished in 1966. All were made in black and white.
Excellent Series and far seeing a shame only 20 episodes survived. The information provided IS correct it aired over 6 years from 1965 to 1971.
https://en.wikipedia.org/wiki/List_of_out_of_the_Unknown_episodes