The Planet is intimidated by an alien race that abduct as well as kill humans and also animals and also as well as utilize them for their body parts. In the year 1980 S.H.A.D.O. (Supreme Headquarters Alien Support Organization), an extremely secret military company, is set up in the hope of defending the Earth from this unusual hazard. This company operates from a secret location below the Harlington-Straker film studio in London. S.H.A.D.O. also has a base on the moon with Interceptors in addition to a very early warning satellite that detects inbound UFOs (called S.I.D.), and also operate a fleet of submarines. General James Henderson and also commander Ed Straker have a team of extremely trained and well furnished women as well as men to battle the on a regular basis inbound aggressive UFOs.