Plot Overview
The show's basic premise is that in the near future – a fictional version of 1980 (a date indicated in the opening credits) – Earth is being visited and attacked by aliens from a dying planet and humans are being covertly harvested for their organs by the aliens. The show's main cast of characters are members of a secret, high technology international agency called SHADO (an acronym for Supreme Headquarters, Alien Defence Organisation) established to defend Earth and humanity against the mysterious aliens and learn more about them.
Read more about this topic: UFO (TV series)
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“Persons attempting to find a motive in this narrative will be prosecuted; persons attempting to find a moral in it will be banished; persons attempting to find a plot in it will be shot.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)