Ancient Aliens
S21 · E9 — The Legacy of J. Allen Hynek
S21:E9 · The Legacy of J. Allen Hynek
20 episodes in this season
The Top Ten Extraordinary Discoveries
42 min
The Top Ten Mysterious Monoliths
The Top Ten UFO Crashes
The Top Ten Unexplained Technologies
The Top Ten Secret Projects
60 min
The Top Ten Mysterious Mountains
Mysteries of the Aztecs
The Glowing Orb Phenomenon
The Legacy of J. Allen Hynek
The Volcano Factor
The Birdman Mystery
The Abduction Files
The Giants
Aliens In Our Midst
Britain's UFO Files
Mysteries Of The Norse Gods
Secrets of Japan
Episode 18
Episode 19
Episode 20
