Thursday, April 2 at 9 pm. Frontline investigates the political and military miscalculations and mistakes behind the brutal rise of ISIS. A year ago, few people had heard of the Islamic State of Iraq and Syria (ISIS)—the brutal jihadist group that President Obama calls a "network of death." How did ISIS become a major force so quickly? And what does it mean for the U.S. to be back in Iraq, fighting a new war on terror, less than three years after American troops pulled out of the country? On October 28, Frontline presents The Rise of ISIS — a major, in-depth investigation of the brutal terrorist group’s ascent, from veteran producer and journalist Martin Smith.