Ancient Aliens

Experts investigate startling evidence suggesting that the Ancient Maya conspired with aliens. Was this how they acquired their knowledge of astrology? (S4, ep 1)

Experts scrutinise the Maya Calendar, which predicted the world would end in 2012. Could it have anticipated the arrival of an extraterrestrial god? (S4, ep 2)

Experts investigate the 'greys' - mysterious beings with big heads and eyes found carved into rocks. Who are these strange figures and what inspired them? (S4, ep 3)

Did Mother Nature cause the volcanoes, earthquakes and floods of ancient times? Or could aliens have been responsible? Experts investigate. (S4, ep 4)

Experts open up NASA and secret government files. Can they find proof of alien contact in the recent or ancient past? (S4, ep 5)

Mystery Of Puma Punku: No one knows who designed and built Bolivia's sophisticated temple complex. Could it have been aliens? Experts investigate. (S4, ep 14)

Ancient astronaut theorists hunt for evidence linking Bigfoot to alien species from the distant past. Could the ape-like giant be an extraterrestrial? (S4, ep 7)

Experts scrutinise the paintings, journals and technical drawings of Leonardo Da Vinci. Could they hide evidence of extra-terrestrial beings? (S4, ep 11)

Time Travellers: Scientists explore the possibility that sightings of alien beings or UFOs may be evidence of time travellers from the future. (S4, ep 12)

Theorists investigate a depiction of a stegosaurus found at Angkor Wat in Cambodia. Could it suggest that alien species killed off the dinosaurs? (S4, ep 13)