エドガー・ケイシー
The series is based on and inspired by the works of Erich von Däniken and Zecharia Sitchin, among other writers. The works of Graham Hancock, Robert Bauval, Brinsley Le Poer Trench, Charles Hapgood, and Edgar Cayce, are also referenced in many episodes. Producer Giorgio Tsoukalos and writer David Childress are featured guests.