Season
- Season 21 2025-02-07
- Season 20 2024-01-05
- Season 19 2023-01-06
- Season 18 2022-01-07
- Season 17 2021-08-06
- Season 16 2020-11-13
- Season 15 2020-01-25
- Season 14 2019-05-31
- Season 13 2018-04-27
- Season 12 2017-04-28
- Season 11 2016-05-06
- Season 10 2015-07-24
- Season 9 2014-10-31
- Season 8 2014-06-13
- Season 7 2014-01-24
- Season 6 2013-09-30
- Season 5 2012-12-21
- Season 4 2012-02-17
- Season 3 2011-07-28
- Season 2 2010-10-28
- Season 1 2010-04-20
- Season 0 2009-03-08
Episode
- Episode 1: The Top Ten Extraordinary Discoveries
- Episode 2: The Top Ten Mysterious Monoliths
- Episode 3: The Top Ten UFO Crashes
- Episode 4: The Top Ten Unexplained Technologies
- Episode 5: The Top Ten Secret Projects
- Episode 6: The Top Ten Mysterious Mountains
- Episode 7: Mysteries of the Aztecs
- Episode 8: The Glowing Orb Phenomenon
- Episode 9: The Legacy of J. Allen Hynek
- Episode 10: The Volcano Factor
- Episode 11: The Birdman Mystery
- Episode 12: The Abduction Files
- Episode 13: The Giants
- Episode 14: Aliens In Our Midst
- Episode 15: Britain's UFO Files
- Episode 16: Mysteries Of The Norse Gods
- Episode 17: Secrets of Japan
- Episode 18: Skulls of the Gods
- Episode 19: Islands of the Gods
Ancient Aliens Season 21
Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the US, each episode gives historic depth to the questions, speculations, provocative controversies, first-hand accounts and grounded theories surrounding this age old debate.
