Colonel Phillip J. Corso, a former advisor to President Eisenhower and head of the Army's Foreign Technology Division, shares his firsthand account of the recovery of alien spacecraft and the study of technology found in the wreckage of extraterrestrial crashes. Apollo 14 astronaut Dr. Edgar Mitchell confirms the reality of the 1947 Roswell UFO incident and details the subsequent decades of government secrecy. Retired Command Sgt. Major Robert O. Dean, a former intelligence analyst, discusses a highly classified 1960s NATO study called 'An Assessment,' designated 'Cosmic Top Secret.' Former Defense Secretary William Perry confirms the existence of Area 51.