Bernice, a shy young woman, leaves her safe home to go visit her flapper cousin. When her cousin tries to teach Bernice how to be much more modern, Bernice gives her much more than she bargained for.

A violent electrical storm topples power lines into the rain soaked earth that is home for an aggressive breed of worms. The high voltage causes the worms to mutate into larger, hostile hordes of man-eating worms that lie in wait for the residents of Fly Creek.