1
Aliens Uncovered: Portal Encounters 2
2025· Documentary· en
—0
Best Alien Documentary Movies
This collection ranks 281 alien documentary movies. The list is ranked using a weighted combination of audience ratings, vote volume and popularity data, so movies with only a handful of votes never outrank widely acclaimed films. At the top sits Aliens Uncovered: Portal Encounters 2.
281 qualifying moviesRanked using a weighted combination of ratings, vote volume and popularity data
- 2
Aliens Uncovered: Jesuit Secrets
2025· Documentary· en
—0 - 3
Ein Sommer in Italien - WM 1990
2026· 1h 37m· Documentary· de
8.511 - 4
The Beast Within: Making Alien
2003· 2h 58m· Documentary· en
8.222 - 5
The Alien Legacy
1999· 1h 8m· Documentary· en
6.711 - 6
Aliens Expanded
2024· 4h 42m· Documentary· en
8.813 - 7
Memory: The Origins of Alien
2019· 1h 35m· Documentary· en
6.4108 - 8
Alien Planet
2005· 1h 34m· Documentary, Science Fiction, Animation· en
7.331 - 9
Wreckage and Rage: Making 'Alien³'
2003· 2h 41m· Documentary· en
7.822 - 10
Superior Firepower: Making 'Aliens'
2003· 3h 5m· Documentary· en
7.620 - 11
Ancient Aliens Debunked
2012· 3h 11m· Documentary· en
6.417 - 12
Aliens Uncovered: The Land of Legends
2024· Documentary· en
—0 - 13
Aliens of the Deep
2005· 1h 35m· Documentary· en
6.184 - 14
Alien Encounters Declassified
2021· 1h 28m· Documentary, TV Movie, Mystery· en
7.02 - 15
When Aliens Attack
2011· 1h 30m· Science Fiction, Fantasy, Documentary· en
5.84 - 16
Alien Endgame
2022· 1h 25m· Documentary· en
6.67 - 17
Lino D’Italia - Storia di un itALIENO
2026· Documentary· it
6.94 - 18
UFO Conspiracies: The Hidden Truth
2020· 1h 0m· Documentary· en
5.86 - 19
UFOs: It Has Begun
1979· 1h 34m· Documentary· en
7.07 - 20
That's a UFO! The Flying Saucer
1975· 16m· Documentary, Animation, Science Fiction· ja
5.24 - 21
Aliens Living Among Us
2025· 45m· Documentary· en
8.01 - 22
Alien Planets Revealed
2014· 54m· Documentary· en
—0 - 23
Giger's Alien
1979· 34m· Documentary· en
7.02 - 24
Aliens and Atlantis: Stargates and Hidden Realms
2016· 1h 0m· Documentary· en
—0 - 25
The Secret KGB UFO Files
1998· 1h 45m· Documentary· en
7.44 - 26
The Alien Saga
2002· 1h 48m· Documentary, Science Fiction· en
6.611 - 27
Confirmation: The Hard Evidence of Aliens Among Us?
1999· 1h 29m· Documentary, TV Movie· en
6.84 - 28
The Paranormal UFO Connection
2024· 1h 35m· Documentary· en
—0 - 29
UFOs: The Secret History
2010· 1h 42m· Documentary· en
7.15 - 30
Alien: Terror in Space
2025· 54m· Documentary, History, TV Movie· fr
7.06 - 31
On the Trail of UFOs: Dark Sky
2021· 1h 25m· Documentary· en
5.02 - 32
Aliens Uncovered: The Golden Record
2023· 1h 15m· Documentary· en
—0 - 33
Alien Encounter at Loch Ness
2014· 1h 15m· Documentary· en
10.01 - 34
I Believe in UFOs: Danny Dyer
2010· 1h 0m· Documentary· en
6.84 - 35
Australien Skies
2015· 1h 13m· Documentary· en
5.33 - 36
UFO Syndrome
1980· 1h 35m· Documentary· en
4.01 - 37
The Secret KGB UFO Abduction Files
2000· 1h 28m· Documentary, History· en
—0 - 38
Aliens and Astronauts: UFO's on the Moon
2015· 58m· Documentary· en
8.02 - 39
The UFO's Bureau
2021· 45m· Mystery, Documentary· fr
6.02 - 40
UFO Chronicles: The Smoking Gun
2019· 1h 5m· Documentary· en
6.01 - 41
Alien Contact: The Pascagoula UFO Encounter
2020· 1h 15m· Documentary· en
8.02 - 42
The Bigfoot Alien Connection Revealed
2020· 1h 32m· Documentary· en
6.02 - 43
Alien Chronicles: Antarctic Worlds Below
—· 1h 10m· Documentary· en
—0 - 44
Alien Gods
2019· 1h 6m· Documentary· en
—0 - 45
Hollywood: Aliens & Monsters
1997· 1h 37m· Science Fiction, Documentary· en
5.01 - 46
For My Alien Friend
2019· 1h 13m· Documentary· tl
—0 - 47
UFO: The Greatest Story Ever Denied
2006· 1h 34m· Documentary· en
7.24 - 48
Aliens in LA
2019· 1h 7m· Documentary, Science Fiction· en
—0 - 49
ETs Among Us: 37 UFO Witnesses and Whistleblowers
2016· 1h 30m· Documentary· en
8.73 - 50
Alien Moon
2019· 1h 10m· Documentary· en
—0
Related collections
- Best Alien Movies of All Time — Ranked
- Best Alien Drama Movies — Ranked
- Best Alien Comedy Movies — Ranked
- Best Alien Horror Movies — Ranked
- Best Alien Animation Movies — Ranked
- Best Alien Music Movies — Ranked
- Best Alien Romance Movies — Ranked
- Best Alien Thriller Movies — Ranked
- Best Alien Action Movies — Ranked
- Best Alien Crime Movies — Ranked
- Best Alien Family Movies — Ranked
- Best Alien TV Movie Movies — Ranked
Frequently asked questions
How many alien documentary movies are there?
281 alien documentary movies carry real rating data.
How are these alien documentary films ranked?
By a weighted score combining audience ratings, vote volume and popularity. Movies with very few votes are statistically shrunk toward the global average, so they cannot dominate the top of the list.
What is the best alien documentary movie?
Aliens Uncovered: Portal Encounters 2 currently holds the #1 position.