ANCIENT ALIENS examines 75 million years of the most credible alien evidence here on Earth. From the age of dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the U.S., each episode gives historic depth to the questions, speculations, 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?

• Robert Clotworthy
• Giorgio A. Tsoukalos
• Ariel Bar Tzadok
• Jonathan Young
• David Childress
• Erich von Däniken
• Linda Moulton Howe
• David Wilcock