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In the year 1980 the Earth is threatened by an alien race who kidnap and kill humans and use them for body parts. A secret military organization is set up to defend the Earth from this alien threat. This organization is named SHADO (Supreme Headquarters Alien Defence Organization) and operates from a secret location beneath a movie lot.

	1x01 Identified After a decade of work, SHADO (the Supreme Headquarter Alien Defense Organization) is finally up and ready to defend the Earth against the recent Alien attacks. Their first task is ...	Sep. 16, 1970
	1x02 Exposed During an XV-104 test plane flight, the pilot spots a UFO, and also sees SHADO’s Sky One aircraft which is chasing it. Although the test plane pilot, Paul Foster, reports his sightings, ...	Sep. 23, 1970
	1x03 The Cat With Ten Lives SHADO finally recovers the body of one of the Aliens, after a UFO attack on the Moonbase. The resulting investigation of the alien reveals the reason why the aliens are targeting the ...	Sep. 30, 1970
	1x04 Conflict When a UFO is able to get through S.H.A.D.O.'s security, and destroy a Moonbase module, the Chairman of the I.A.C demands the removal of Straker and the complete shutdown of S.H.A. ...	Oct. 07, 1970
	1x05 A Question of Priorities Straker must choose between the life of his critically ill son and stopping a sighted UFO, as the S.H.A.D.O. plane taking his son to “time critical” medical help is the only plane ...	Oct. 14, 1970
	1x06 E.S.P. The UFO Aliens enhance a human’s abnormally high E.S.P. abilities in an attempt to learn the secrets of S.H.A.D.O, and to atempt to kill Straker and Freeman.	Oct. 21, 1970
	1x07 Kill Straker! Straker’s split second, but controversial decision, which leads to saving the lives of several astronauts from a UFO attack, leads to a subordinate questioning Straker's authorit ...	Nov. 04, 1970
	1x08 Sub-Smash A UFO attack leaves Straker, Foster and the crew of a Skydiver trapped on a ledge, deep under water, with little hope of rescue.	Nov. 11, 1970
	1x09 Destruction Straker uncovers a conspiracy of major proportions when the downing of a UFO by the British navy is found to have been covered up.	Dec. 02, 1970
	1x10 The Square Triangle When an injured and fleeing alien is shot dead by a couple, it soon becomes apparent the alien was not the real target of the shooting.	Dec. 09, 1970
	1x11 Close Up S.H.A.D.O gets approval to send a probe to survey and observe the location of the UFO alien’s home world. However, the problem is they first need to find one of the UFO’s, in order ...	Dec. 16, 1970
	1x12 The Psychobombs The UFO aliens have found a way to take over the minds of three humans and give them special powers, and use them to destroy several critical S.H.A.D.O. installations. However, the ...	Dec. 30, 1970
	1x13 Survival A fatal decompression of a Moonbase sphere turns out to have been caused by a lone bullet fired by a UFO alien. However, Foster’s investigation into the matter, soon puts his life ...	Jan. 06, 1971
	1x14 Mindbender A UFO is destroyed near a Moonbase, and a diamond-like stone is recovered. However, the stone turns out to be a plant by the aliens with hypnotic properties. Soon the Moonbase appears ...	Jan. 13, 1971
	1x15 Flight Path Stryker learns that a S.H.A.D.O. technician is passing vital information to the UFO aliens. What the information is becomes the real question. It is soon learned that it is the secret ...	Jan. 20, 1971
	1x16 The Man Who Came Back When a UFO attack leaves S.I.D. disabled and an astronaut presumed dead, the astronaut turns up alive and well. However, is he really the same person he was before the UFO attack?	Feb. 03, 1971
	1x17 The Dalotek Affair Foster investigates blackouts on the Moonbase, and soon begins to see a link to the Dalotek installation team’s installation on the Moon. When a second blackout causes the deaths ...	Feb. 10, 1971
	1x18 Timelash When Straker and Col. Lake arrive at the SHADO headquarters and find all the personnel in a frozen state in time, they realize that this “timelash” has been caused by the UFO Aliens. ...	Feb. 17, 1971
	1x19 Ordeal Foster, tired and hung over from the night before, is required to take part in a mandatory fitness test at the S.H.A.D.O. Research Center, during which he passes out while in the sauna. ...	Apr. 14, 1971
	1x20 Court Martial When it appears Foster has divulged secret S.H.A.D.O. information to the media, which could lead to a death sentence for him, it is left to Straker and Freeman to find out who has really ...	May. 01, 1971
	1x21 Computer Affair When a UFO gets through Earth’s defenses, and an astronaut is killed, Striker believes human error is to blame. Is the intimate relationship between two of the S.H.A.D.O.'s members ...	May. 15, 1971
	1x22 Confetti Check A-O.K. When Lt. Grey’s first child is born, Straker reminisces about the beginnings of S.H.A.D.O., and the disastrous effect his work has had on his own marriage and his kids.	Jul. 10, 1971
	1x23 The Sound of Silence When an international horse show-jumper goes missing, and a lake is found barren of life, and a mutilated animal corpse is found after S.H.A.D.O. tracks a UFO into a heavily wooded ...	Jul. 17, 1971
	1x24 Reflections in the Water Straker is able to discern a new deceptive alien attack strategy, after a freighter is sunk by a missile, and underwater cameraman dies, and they see an unusually heavy UFO activity ...	Jul. 24, 1971
	1x25 The Responsibility Seat As Straker tries to recover the information obtained from a bug left by a reporter, Freeman has to deal with a Russian mobile Moon rig, which has gone out of control, and is headed ...	Mar. 08, 1973
	1x26 The Long Sleep When a woman awakens from a ten year coma, she gives vital information about a close alien encounter she had in an old abandoned farmhouse. Straker must make sense of her memories in ...	Mar. 15, 1973