A highly advanced civilization, whose citizens feel no emotion and reproduce by cloning, plans to conquer Earth from the inside by sending an operative, fashioned with a humming, mechanical penis, to impregnate a human and stay until the birth. The alien, Harold Anderson, goes to Phoenix as a banker and sets to work finding a mate. His approaches to women are inept, and the humming phallus doesn't help, but on the advice of a banking colleague, he cruises an A.A. meeting, meets Susan, and somehow convinces her to marry him. The clock starts to tick: will she conceive, have a baby, and lose Harold (and the child) to his planet before he discovers emotion and starts to care?