A shocking DNA study reveals that the original builders of Stonehenge mysteriously vanished. Investigating if Stonehenge's mysterious "Bluestone circle" could have activated a portal that transported the ancient culture back to their former home among the stars.
Over the past 20 years, thousands of potentially habitable exoplanets have been discovered outside our solar system. It is discussed whether some of them could be home to intelligent extraterrestrial life.
Possible historic evidence and beliefs are examined around the world. The Dogon people possess knowledge of a galaxy they claim was given to them by a star god named Amma; the Hopi and Zuni people celebrate Kachinas, gods from the sky; Chinese legends tell of the Han leader, Huangdi, arriving on Earth on a flying, yellow dragon. Ancient astronaut theorists believe that extraterrestrials not only interacted with humans, but changed the course of human history.