Including results for alien theory 2019.
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The Evidence For Alien Theories *MARATHON* | Ancient Aliens
2:12:19
The Evidence For Alien Theories *MARATHON* | Ancient Aliens
176.1K views3 months ago
YouTubeHISTORY
Why haven’t we found aliens? A physicist shares the most popular theories. | Brian Cox
12:47
Why haven’t we found aliens? A physicist shares the most popular theories. | Brian Cox
3M viewsSep 29, 2023
YouTubeBig Think
Alien Theories You Have to See to Believe | Ancient Aliens | Marathon | History
2:12:17
Alien Theories You Have to See to Believe | Ancient Aliens | Marathon | History
529.1K viewsJun 6, 2025
YouTubeHISTORY
Most CHILLING Alien Theories *MARATHON* | Ancient Aliens
3:43:03
Most CHILLING Alien Theories *MARATHON* | Ancient Aliens
1.1M views8 months ago
YouTubeHISTORY
The Extraterrestrial Genetic Theory | Ancient Aliens
42:26
The Extraterrestrial Genetic Theory | Ancient Aliens
87.4K views3 months ago
YouTubeHISTORY
Extraterrestrial Secrets of Mankind's Past | Ancient Aliens
22:24
Extraterrestrial Secrets of Mankind's Past | Ancient Aliens
185.6K views4 months ago
YouTubeHISTORY
Are Humans Actually Aliens? The Shocking Theory Explained (S1) | Ancient Aliens
8:28
Are Humans Actually Aliens? The Shocking Theory Explained (S1) | Ancient Aliens
100.5K views5 months ago
YouTubeHISTORY
30:26
The most unsettling alien theory
2 months ago
MSNIsaac Arthur
37:13
Have Aliens Been Visiting Earth for Millions of Years? | Ancient Aliens | History
7.3M viewsApr 3, 2025
YouTubeHISTORY
48:49
Inside the Mystery of the Greys | Ancient Aliens
1.6M views9 months ago
YouTubeHISTORY
24:23
Are the Greys Already Among Us? Alien Hybrids & Robots Revealed | Ancient Aliens | History
702.2K viewsAug 11, 2025
YouTubeHISTORY
41:19
What NASA Knows About Mars | Ancient Aliens
676.4K views8 months ago
YouTubeHISTORY
20:20
The Truth Behind These Unexplained Phenomena | Ancient Aliens
210.2K views5 months ago
YouTubeHISTORY
25:21
Are We Part Alien? | Ancient Aliens
76K views7 months ago
YouTubeHISTORY
30:26
The most unsettling alien theory
2 months ago
MSNIsaac Arthur
11:16
These alien conspiracy theories are some of the most popular! | WatchMojo
51K viewsAug 4, 2022
FacebookWatchMojo
32:32
The Hybrid Theory: Human or Alien? | Ancient Aliens | History
1.1M views11 months ago
YouTubeHISTORY
30:56
Egypt’s Greatest Secrets and Alien Theories | Ancient Aliens
365.5K views5 months ago
YouTubeHISTORY
20:43
Top 20 Alien Conspiracy Theories
97.3K viewsNov 14, 2024
YouTubeWatchMojo.com
8:38
Alien: Earth — Theories That Actually Fit the Timeline
49.5K viewsAug 26, 2025
YouTubeScreenRant
6:07
Ancient Aliens: The Shocking Theory Behind the Gods (S1)
27.5K views5 months ago
YouTubeHISTORY
20:27
Humans From the Future | Ancient Aliens | History
2.1M viewsMay 8, 2025
YouTubeHISTORY
59:11
Ancient Aliens: TOP UFO MYSTERIES OF 2025 | Part 1
427.2K views10 months ago
YouTubeHISTORY
1:30:54
Alien Contact: How Would Humanity React? | FULL DOCUMENTARY
700.6K viewsMar 9, 2025
YouTubeNaked Science
38:13
Explaining Advanced Ancient Egyptian Technologies | Ancient Aliens | Compilation | History
6.3M viewsMay 13, 2025
YouTubeHISTORY
12:26
Top 10 Extraterrestrial Conspiracy Theories of All Time
190.4K viewsJul 16, 2022
YouTubeWatchMojo.com
23:35
Space Secrets and NASA’s Role in the Alien Agenda | Ancient Aliens | History
273.4K viewsAug 18, 2025
YouTubeHISTORY
2:16
The Alien Perspective - Official Trailer
90.7K viewsJan 2, 2025
YouTubeIGN
2:12:06
Alien Origins and UFO Encounters from Another Dimension (Part 4)
112K viewsJan 28, 2022
YouTubeExtreme Mysteries
7:09
What If Earth Is Controlled By Aliens? | Unveiled
21.9K viewsAug 8, 2020
YouTubeUnveiled
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