A British science fiction TV series created in 1970 by Gerry Anderson, about a secret organization, called SHADO, which defends the Earth from Alien invaders. Only the first season was produced, with a total of 26 episodes.

Ten years into (their) future (1980), the military discovered that aliens were coming to Earth and kidnapping people. SHADO (Supreme Headquarters Alien Defence Organisation) is created to put a stop to it. SHADO's main headquarters are hidden beneath a film studio in London. SHADO also has a Moon Base (called just "Moonbase"), a fleet of submarines called "Skydiver", orbiting satellites to detect the UFOs (called SID, or Space Intruder Detector), fighter like space interceptors, and a fighter plane ("Sky One") that is launched from Skydiver.

Some curious things about the show: