Season
- 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 21 The Top Ten Extraordinary Discoveries
- Season 21 The Top Ten Mysterious Monoliths
- Season 21 The Top Ten UFO Crashes
- Season 21 The Top Ten Unexplained Technologies
- Season 21 The Top Ten Secret Projects
- Season 21 The Top Ten Mysterious Mountains
- Season 21 Mysteries of the Aztecs
- Season 21 The Glowing Orb Phenomenon
- Season 21 The Legacy of J. Allen Hynek
- Season 21 The Volcano Factor
- Season 21 The Birdman Mystery
- Season 21 The Abduction Files
- Season 21 The Giants
- Season 21 Aliens In Our Midst
- Season 21 Britain's UFO Files
- Season 21 Mysteries Of The Norse Gods
- Season 21 Secrets of Japan
- Season 21 Skulls of the Gods
- Season 21 Islands of the Gods
Ancient Aliens
7.00 42 minutes 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.
