1x23 The Sound of Silence
First Aired: Jul. 17, 1971 on ITV
Summary: 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 area, can S.H.A.D.O. find the alien link to these events?
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Guest Stars[no credits found]