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.
Episode number: 1x14 Production Number: 125 Airdate: Wednesday January 13th, 1971