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.[1][2]

"The Square Triangle"
UFO episode
Episode no.Season 1
Episode 10
Directed byDavid Lane
Written byAlan Pattillo
Production code3 September to 15 September, 1969
Original air date9 December 1970 (ATV Midlands)

The series was created by Gerry Anderson and Sylvia Anderson with Reg Hill, and produced by the Andersons and Lew Grade's Century 21 Productions for Grade's ITC Entertainment company.[3]


Straker allows a UFO to land in England in the hope of sending out SHADO's mobile operatives to capture it and its occupants. However, the UFO self destructs and a lone alien wanders away. Close to the landing site Liz Newton is conspiring with her lover to murder Liz's husband, Jack. They plan to shoot Jack upon arriving home is foiled when an alien instead appears, and they shoot him instead.

Foster and his investigation team arrive and cart the couple off to SHADO headquarters. There they are given amnesia drugs to make them forget the shooting of the alien.

Jack returns to the cottage and is greeted by Foster, who then deduces the couple's murderous plan. Straker realises they cannot share this information with the authorities as they would want to know how they obtained it. The final shot shows Liz looking at a grave, presumably having carried the plan to kill her husband.[4]



Also starring


Production notes

Anthony Chinn is one of 11 actors to appear in both Doppelgänger and the UFO series. This was also his second episode having previously appeared as an officer on Skydiver in Sub-Smash.

Locations included Black Park and Black Park Cottage in Iver Heath, Buckinghamshire.


  1. "UFO Episode Guide - The Square Triangle". Fanderson. Retrieved 23 October 2017.
  2. "UFO Characters - The Square Triangle". SHADO Library. Retrieved 23 October 2017.
  3. "Underappreciated TV: UFO". Den of Geek. Retrieved 23 October 2017.
  4. Bentley, Chris (10 January 2003). The Complete Book of Gerry Anderson's UFO. 978-1903111659. p. 74. ISBN 978-1903111659.
Last produced:
"The Responsibility Seat"
UFO episodes Next produced:
"Court Martial"
Last transmitted:
Next transmitted:
"Close Up"
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