Synopsis:
A enzyme is used to interrupt the male reproduction system and wipe out flies in the rain forest. An epidemiologist wonders if maybe the strange behavior of men in Jacksonville Florida is caused by the enzyme. Men throughout the US and the world start killing all the women they encounter. Barney takes a shot to prevent his chemical balance from being tampered with by the enzyme and tries to save the women who are left. In the end, it appears that aliens decided to wipe out the human race much like humans wiped out the screw-fly population.
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