UFO (TV series)
A single season of 26 episodes (including the pilot) was filmed over the course of more than a year; a five-month production break was caused by the closure of MGM-British Studios in Borehamwood, where the show was initially made. Production then moved to Pinewood Studios in Buckinghamshire. "UFO" was first broadcast in the UK and Canada in 1970, and in US syndication over the next two years.
The Square Triangle
"The Square Triangle" is the tenth episode aired of the first series of "UFO" - a 1970 British television science fiction series about an alien invasion of Earth. The screenplay was written Alan Pattillo and the director was David Lane. The episode was filmed between 3 September to 15 September, 1969 and aired on the ATV Midlands on 9 December 1970. Though shown as the ninth episode, it was actually the eleventh to have been filmed.