Andre (Andre Keuck) and Cal (Cal Robertson) are a pair of military-loving misfits from small-town America. They harbor a hatred of their high school so caustic that they come up with a plan of attack called "Zero Day." As the days count down, they record their preparations in video diaries, hoping to achieve fame after their demise. When Zero Day arrives, Andre and Cal drive to school with a trunk of munitions and take aim. The film is based on the Columbine High School massacre.