Genre: Documentary, History, Paranormal
Premise: Investigators circle the globe in search of evidence in their quest to determine whether life on Earth began in outer space and if aliens influenced mankind in ancient times. Did extraterrestrial beings visit Earth and share information about technology and influence human religions? And more importantly, if aliens visited the planet before, will they return? Alien theorists believe that the answer to both questions is a resounding yes.
S03, E13 (First Aired: Oct. 19, 2011)
People consider whether ancient man's spectacular structures were built by humans alone or with otherworldly visitors.
S04, E10 (First Aired: May. 4, 2012)
Ancient alien theorists wonder about the depiction of a stegosaurus in Angkor Wat, the world's largest ancient religious temple, and ask how the ancients could have known about dinosaurs.