Based on the Andrew Smith novel, "Grasshopper Jungle," officially described as follows:
In the small town of Ealing, Iowa, Austin and his best friend Robby have accidentally unleashed an unstoppable army. An army of horny, hungry, six-foot-tall praying mantises that only want to do two things. This is the truth. This is history. It’s the end of the world. And nobody knows anything about it. You know what I mean.