David is drawn into the space program by a series of coincidences that convince him of alien involvement. But why do the aliens want to put one of their own on a manned mission? Surely they can get to space whenever they need to. The answer may lie in the meaning of some photographs taken by an unmanned probe. Photographs that reveal some disturbingly regular objects on the moon's surface. Written by
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John Ericson's bare-chest scene provides the best "beefcake" of the entire series, easily surpassing the series' trio of bare-chest scenes featuring Roy Thinnes. See more
In the far reaches of outer space, the Invader reorganizes his plan for the conquest of the Earth. He's been delayed - but he hasn't been beaten.