From the age of dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the United States, each episode gives historic depth to the questions, speculations, provocative controversies, firsthand accounts, and grounded theories surrounding an age-old debate: Did intelligent life forms from outer space visit Earth thousands of years ago? Do they visit us now? Episodes include: Mysterious Places; Aliens and the Third Reich; Alien Devastations; and much more.