First Aired: Jan. 13, 1971 on ITV
Summary: 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 to be infested with Mexican bandits, and the aliens appeare to be in S.H.A.D.O. headquarters.
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Guest Stars[no credits found]