FRONTLINE "The Warning" PBS http://www.pbs.org/frontline/warning/ FRONTLINE producer Michael Kirk unearths the hidden history of the nation’s worst financial crisis since the Great Depression, explores the early warning signs, and asks: Who knew? And who ignored? "The Warning" airs Tuesday, Oct. 20 at 9PM on PBS (check local listings). In the devastating aftermath of the economic meltdown, FRONTLINE sifts the ashes for clues about why it happened and examines critical moments when it might have gone much differently. Looking back into the 1990s, veteran FRONTLINE producer/director Michael Kirk ("Inside the Meltdown," "Breaking the Bank") discovers early warnings of the crash, reveals an intense battle among high-ranking members of the Clinton administration and uncovers a concerted effort not to regulate the emerging, highly complex and lucrative derivatives markets that would become the ticking time bomb within the American economy. Watch "The Warning" on air and online beginning Tuesday, October 20 on PBS (check local listings) and at http://www.pbs.org/frontline/warning/