Where ISIS Came from and How It Became So Brutally Powerful

Frontline correspondent Martin Smith reports from Iraq on how and why the brutal jihadist group ISIS came to power.

Frontline producer and journalist Martin Smith talks about "The Rise of ISIS," an in-depth investigation of the brutal terrorist group’s ascent. Smith describes his interviews with Iraqi politicians, American policymakers and military leaders to explore and explain how ISIS developed into what one interviewee calls “the Al Qaeda that Osama bin Laden only dreamed of building.” "The Rise of ISIS" premiers October 28, at 10 p.m., on PBS.