UFO is a 1970 British science fiction television series about a secret military organization which defends the Earth from Alien invaders. The series was created by Gerry & Sylvia Anderson, who previously created the "Supermarionation" puppet TV series in the 1960's (THUNDERBIRDS, FIREBALL XL-5, etc.), and would later create SPACE: 1999. UFO was filmed in 1969-70, and began broadcasting in September 1970 in England and September 1972 in America. The series ran for only a single season, for a total of 26 one-hour color episodes.
Episode 5: When civilian test pilot
Paul Foster inadvertently witnesses a SHADO operation, he is given a choice: join SHADO or die.