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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.
Following a 2017 public disclosure of secret government UFO investigations, are we any closer to proving there has been a UFO conspiracy? (S11, ep 1)
Researchers claim hidden messages can be found within the works of Leonardo da Vinci that may reveal an extraterrestrial influence. (S11, ep 2)
In 2017, a strange, cigar-shaped object enters the solar system, causing some astronomers to suggest that it could be an extraterrestrial craft. (S11, ep 3)
Theorists speculate about the existence of black holes on Earth, which may explain strange disappearances and other inexplicable phenomena. (S11, ep 4)
Researchers study giant ancient drawings found etched into the desert floor, which may be a part of an ancient alien code. (S11, ep 5)
Could Area 51's notoriety act as a cover up to much bigger, top-secret extraterrestrial experiments taking place at multiple locations? (S11, ep 6)
Ancient Astronaut theorist Giorgio A. Tsoukalos explores the latest evidence that suggests extraterrestrials visited Egypt in the distant past. (S11, ep 12)
Oak Island treasure hunter Marty Lagina and Ancient Astronaut theorist Giorgio A. Tsoukalos explore the ancient ruins of Sardinia, Italy. (S11, ep 7)
Seven stone giants stand guard over a Pacific island. But what are they protecting? And from whom? (S11, ep 9)
Have the US and Russia been working together from the beginning of the Space Race in preparation for the ultimate extraterrestrial encounter? (S11, ep 10)
Ancient Astronaut theorists explore the idea that meteorites could be pieces of extraterrestrial technology. (S11, ep 11)
Are intelligent robots the next step in human evolution? As man and machine begin to merge, are we fulfilling a destiny prepared for us by aliens? (S11, ep 13)
Erich von Daniken's "Chariots of the Gods?" suggests that aliens visited Earth in the past. 50 years after the book's publication, can he be proven right? (S11, ep 15)
As humanity prepares to establish colonies beyond Earth, are we pursuing a new future for mankind or returning to its extraterrestrial past? (S11, ep 14)