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- Season 13 overviewApr 27, 2018-Jan 7, 201915 episodesSeason 13 episodes15. Return to Mars Jan 7, 2019
- An examination of possible encounters humans could have once colonies are established beyond Earth.
- 14. The Alien Phenomenon Jan 4, 2019
- Erich von Däniken's "Chariots of the Gods?" suggests aliens visited Earth in the distant past.
- 13. The Artificial Human Aug 31, 2018
- A look at intelligent robots: whether they are a threat to humanity or the next step in evolution.
- 12. They Came From the Sky Aug 24, 2018
- Ancient cultures from around the world believed that meteorites were sacred stones.
- 11. Russia Declassified Aug 17, 2018
- Questions remain whether or not the U.S. and Russia have been working together.
- 10. The Sentinels Aug 10, 2018
- A Polynesian land of bizarre figures; evidence of mankind's extraterrestrial origins.
- 9. The Taken Aug 3, 2018
- Millions of people around the world claim to have been abducted by extraterrestrials.
- 8. Island of the Giants Jul 27, 2018
- Marty Lagina and Giorgio A. Tsoukalos explore ancient mysteries in Sardinia, Italy.
- 7. Earth Station Egypt Jul 20, 2018
- Giorgio A. Tsoukalos looks for evidence that extraterrestrials visited Egypt in the distant past.
- 6. Area 52 Jun 1, 2018
- A look at whether or not Area 51's notoriety acts as a cover-up.
- 5. The Desert Codes May 25, 2018
- Researchers study giant drawings etched into the desert floor, which may be a part of an alien code.
- 4. Earth's Black Holes May 18, 2018
- Theorists speculate about black holes on Earth, which may have caused strange disappearances.
- 3. The Alien Protocols May 11, 2018
- In 2017, a strange, cigar-shaped object enters the solar system from another star system.
- 2. Da Vinci's Forbidden Codes May 4, 2018
- Researchers claim hidden messages can be found within the works of Leonardo da Vinci.
- 1. The UFO Conspiracy Apr 27, 2018
- The latest disclosure about a series of secret government UFO projects dating back decades.