All 26 episodes of the British sci-fi series set in 1980 as Earth is being invaded by aliens fleeing their dying planet and seeking human organs to extend their lifespan. Specialist task force SHADO (Supreme Headquarters Alien Defence Organisation), headed by Commander Edward Straker (Ed Bishop), must defend Earth against these mysterious hostile creatures, while containing knowledge of them to avoid widespread panic. The episodes are: 'Identified', 'Exposed', 'Kill Straker!', 'The Cat With Ten Lives', 'Conflict', 'E.S.P.', 'The Sound of Silence', 'A Question of Priorities', 'The Square Triangle', 'Sub-Smash', 'Destruction', 'Computer Affair', 'Close Up', 'The Psychobombs', 'Survival', 'Mindbender', 'Flight Path', 'Ordeal', 'The Man Who Came Back', 'The Dalotek Affair', 'Timelash', 'The Responsibility Seat', 'The Long Sleep', 'Court Martial', 'Confetti Check A-O.K.' and 'Reflections in the Water'.