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- Season 0 2009-03-08
- Season 1 2010-04-20
- Season 2 2010-10-28
- Season 3 2011-07-28
- Season 4 2012-02-17
- Season 5 2012-12-21
- Season 6 2013-09-30
- Season 7 2014-01-24
- Season 8 2014-06-13
- Season 9 2014-10-31
- Season 10 2015-07-24
- Season 11 2016-05-06
- Season 12 2017-04-28
- Season 13 2018-04-27
- Season 14 2019-05-31
- Season 15 2020-01-25
- Season 16 2020-11-13
- Season 17 2021-08-06
- Season 18 2022-01-07
- Season 19 2023-01-06
- Season 20 2024-01-05
- Season 21 2025-02-07
Season 21 Episode
- Season 20 The Top Ten Alien Influencers
- Season 20 The Top Ten Extraordinary Creatures
- Season 20 The Top Ten Hidden Alien Bases
- Season 20 The Top Ten Scariest Encounters
- Season 20 The Top Ten Alien Codes
- Season 20 The Top Ten Alien Disasters
- Season 20 Secrets Of The Sumerians
- Season 20 The UFO Superhighway
- Season 20 Mysteries of Scotland
- Season 20 Mystery of the Stone Spheres
- Season 20 Mysteries of the Maya
- Season 20 Unlocking the Stargates
- Season 20 The Whistleblowers
- Season 20 The Search For Extraterrestrial Intelligence
- Season 20 Jacques Vallée: UFO Pioneer
- Season 20 The Teachers
- Season 20 Egypt's Giant Tombs
- Season 20 The Linda Moulton Howe Files
- Season 20 The Chosen
- Season 20 Resurrecting Puma Punku
Ancient Aliens - Season 20 Episode 12 Unlocking the Stargates
6.90 42 minutes For thousands of years, cultures around the world have held a belief in stargates through which beings have traveled to Earth from distant points in the universe and even other dimensions. Could such portals truly exist? And if we obtain the key to unlocking the stargates, will we find a cosmos teaming with life?
