S2, E3: When defense expert Daniel Ellsberg worked on a secret government study in 1969 about the Vietnam War, he realized that American leaders were lying to the public--they knew it was not a winnable war. Ellsberg decided to secretly copy the study and give it the nation's top newspapers. The "Pentagon Papers" became a national scandal. Ellsberg talks to William Shatner about his reasons for breaching top-secret confidentialities, and the remarkable aftermath of the groundbreaking media and legal battles over the "Pentagon Papers.