A small town is demolished, and dozens of innocent people come up missing. Reporter Audrey Aimes (Peggy Castle) smells a scoop, and with the aid of Dr. Ed Wainwright (Peter Graves), the truth behind the titanic terror growing in the Illinois heartland is soon uncovered. Could it be that the Department of Agriculture's radiation experiments have created a race of giant, man-eating grasshoppers? Wouldn't bet against it!