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 15 The Mystery of Nan Madol
- Season 15 The Relics of Roswell
- Season 15 Destination Chile
- Season 15 The Real Men in Black
- Season 15 The Mystery of the Stone Giants
- Season 15 The World Before Time
- Season 15 They Came from The Pleiades
- Season 15 The Immortality Machine
- Season 15 The Shapeshifters
- Season 15 The Mystery of Skinwalker Ranch
- Season 15 The Ultimate Guide to UFOs
- Season 15 Aliens and the Presidents
Ancient Aliens - Season 15 Episode 6 The World Before Time
7.00 42 minutes Shocking new evidence reveals that advanced civilizations might have existed on Earth tens of thousands of years ago. Is it possible that a technologically advanced society thrived on Earth then’ And did they leave behind a record that they lived alongside extraterrestrial beings’
