These tantalizing Discovery Channel programs explore the questions everyone's asking about UFOs and alien invasions! In "NASA's Unexplained Files," "Alien Encounters," and "The Aliens Have Landed," viewers delve into the myriad theories concerning extraterrestrial life, as startling interviews and film footage reveal the evidence that exists according to astronauts, people who claim to have been abducted, and more. Are we alone in the universe...or not? 3 1/2 hrs. total. Widescreen (Enhanced); Soundtrack: English Dolby Digital stereo; Subtitles: English.