Prolific documentarian Alex Gibney continues his roll of crafting some of the most intriguing and topical films in recent years with Zero Days, this time taking a look at a new and different kind of international warfare. It's not one fought with bullets or bombs, but with computer scripts, some so potent that they can infect a device, stop production in a factory, and perhaps, if one were powerful enough, take down a massive power grid that could end up costing billions of dollars to the country it is inflicted upon.