Modelling themselves after an idyllic cookie-cutter suburban 1950s family, a colony of insects move from South America into the United States with the intent of getting access to the nation's nuclear resources.

Giant praying mantises living in a South American jungle decide to move into suburban U.S. Disguised as humans, they are planning something. Could it be connected to Richard P. Applegate's (Ed Begley, Jr.'s) job in the power station perhaps? One day, Sally Applegate (Camille Cooper) forgets what she really is when she's with her boyfriend. Oops!—s jones