The Mystery Of Nazca: Giorgio Tsoukalos heads to Peru to investigate whether the strange symbols covering its desert floor are key to proving aliens once visited Earth. (S1, ep 9)
The Founding of America: Giorgio Tsoukalos investigates whether alien encounters influenced the establishing acts of the Founding Fathers as he travels to Washington DC. (S1, ep 8)
The Mystery Of Puma Punku: Experts explore the puzzling construction of Puma Punku in Bolivia. Could advanced technology have been used to carve the ancient temple complex? (S1, ep 7)
The Mystery Of The Cyclops: Experts investigate whether an advanced civilisation of giants built Malta's mysterious megaliths. Could they have had extraterrestrial help? (S1, ep 6)
Searching For Bigfoot: Experts investigate why sightings of Bigfoot are so often accompanied by reports of UFOs. Could the Sasquatch be an alien living in our midst? (S1, ep 5)
The Mystery Of Loch Ness: Giorgio Tsoukalos investigates whether sightings of the Loch Ness monster could be caused by a disturbance in the space-time continuum. (S1, ep 4)
Nazi Time Travelers: Experts join the trail of purported Nazi time travel device, Die Glocke. Did it really exist? And could it have been based on alien technology? (S1, ep 3)
The Hunt For Atlantis: New clues narrow down the possible location of Atlantis and suggest that Plato's mysterious island was the home of an advanced civilisation. (S1, ep 2)
The Roswell Rock: Ancient Aliens' Giorgio Tsoukalos investigates whether aliens lie at the heart of Earth's most famous mysteries, beginning with the enigma of Roswell Rock. (S1, ep 1)
William Dillon: Wrongly convicted of murder, William Dillon languished behind bars for 27 years while up to four killers walked free. Here, he tells his harrowing story. (S1, ep 6)