UFO was a 1970 British television science fiction series about an alien invasion of Earth. 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 characters are members of a secret, international agency called SHADO (an acronym for Supreme Headquarters, Alien Defence Organisation) established to defend Earth against the mysterious aliens, while at the same time keeping the threat of an alien invasion hidden from the public. The entire series is here.
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