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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“The plot was most interesting. It belonged to no particular age, people, or country, and was perhaps the more delightful on that account, as nobody’s previous information could afford the remotest glimmering of what would ever come of it.”
—Charles Dickens (1812–1870)