Out of the Unknown
From Tardis Wiki, the free Doctor Who reference
Out of the Unknown was a British science fiction series.
When he encountered a Dalek, Kennedy thought it looked like the kind of robot that the BBC dreamed up for Out of the Unknown. (PROSE: The Evil of the Daleks)
Behind the scenes
Numerous Doctor Who actors appeared on Out of the Unknown, including Patrick Troughton, Deborah Watling, Bernard Kay and Bernard Horsfall.