Alien Theory Episodes - Search Videos

Are the Gods Really Returning? *Marathon* | Ancient Aliens

Are the Gods Really Returning? *Marathon* | Ancient Aliens

This Ancient Aliens marathon explores theories of extraterrestrial returns, ancient alien devastations, and the powerful connections between gods and aliens that may have shaped humanity’s past—and its future. Watch new episodes New Episodes Thursdays at 9/8c and stay up to date on all of your favorite shows on The HISTORY Channel website ...

487.7K views3 months ago

Veronica Cartwright remembers slapping Sigourney Weaver - Texas Frightmare Weekend Alien Panel 2013 | Alien_Theory

Veronica Cartwright remembers slapping Sigourney Weaver - Texas

Veronica Cartwright and Tom Skerritt share thoughts on Alien sequels and Prequels - Texas Frightmare Weekend Alien Panel 2013 | Alien_Theory

Veronica Cartwright and Tom Skerritt share thoughts on Alien sequels and Prequels -

Alien Theory Best Episodes

The Truth Behind Aliens, Cover-Ups, and the Unknown *Marathon* | Ancient Aliens

The Truth Behind Aliens, Cover-Ups, and the Unknown *Marathon* | Ancient Aliens

118.7K views1 week ago

The Alien Code (S1, E10) | In Search of Aliens | Full Episode

The Alien Code (S1, E10) | In Search of Aliens | Full Episode

40.3K views2 months ago

Did Ancients Copy UFO Designs? (S19, E18) | Ancient Aliens | Full Episode

Did Ancients Copy UFO Designs? (S19, E18) | Ancient Aliens | Full Episode

35.6K views1 week ago

Top videos

Were We Visited by Aliens Long Ago? Theories and Evidence (S11, E4) | Ancient Aliens | Full Episode

Were We Visited by Aliens Long Ago? Theories and Evidence (S11, E4) | Ancient Aliens | Full Episode

1.4M views9 months ago

Most CHILLING Alien Theories *MARATHON* | Ancient Aliens

Most CHILLING Alien Theories *MARATHON* | Ancient Aliens

673.8K views3 months ago

Alien Theories You Have to See to Believe | Ancient Aliens | Marathon | History

Alien Theories You Have to See to Believe | Ancient Aliens | Marathon | History

492.1K views11 months ago

Alien Theory Controversies

Mysteries That Challenge Human Origins *Marathon* | Ancient Aliens

Mysteries That Challenge Human Origins *Marathon* | Ancient Aliens

304K views1 month ago

Are Humans Actually Aliens? The Shocking Theory Explained (S1) | Ancient Aliens

Are Humans Actually Aliens? The Shocking Theory Explained (S1) | Ancient Aliens

80.3K views2 weeks ago

What the Government Knows About UFOs | Ancient Aliens

What the Government Knows About UFOs | Ancient Aliens

126.4K views2 weeks ago

Were We Visited by Aliens Long Ago? Theories and Evidence (S11, E4) | Ancient Aliens | Full Episode

Were We Visited by Aliens Long Ago? Theories and Evidence (S11, E4) | Ancient Aliens | Full Episode

1.4M views9 months ago

Most CHILLING Alien Theories *MARATHON* | Ancient Aliens

Most CHILLING Alien Theories *MARATHON* | Ancient Aliens

673.8K views3 months ago

Alien Theories You Have to See to Believe | Ancient Aliens | Marathon | History

Alien Theories You Have to See to Believe | Ancient Aliens | Marathon | History

492.1K views11 months ago

Are Humans Actually Aliens? The Shocking Theory Explained (S1) | Ancient Aliens

Are Humans Actually Aliens? The Shocking Theory Explained (S1) | Ancient Aliens

80.3K views2 weeks ago

Secrets From Earth’s Earliest Ages *Marathon* | Ancient Aliens

Secrets From Earth’s Earliest Ages *Marathon* | Ancient Aliens

253K views3 months ago

Einstein and the Alien Genius Theory (S5, E5) | Ancient Aliens | Full Episode

Einstein and the Alien Genius Theory (S5, E5) | Ancient Aliens | Full Episode

3.5K views2 months ago

YouTubeThe UnXplained Zone

Inside the Mystery of the Greys | Ancient Aliens

Inside the Mystery of the Greys | Ancient Aliens

1.5M views3 months ago

The Alien Code (S1, E10) | In Search of Aliens | Full Episode

40.3K views2 months ago

Have Aliens Been Visiting Earth for Millions of Years? | Ancient Aliens | History

6.9M viewsApr 3, 2025

Aliens Were Already Here | Ancient Aliens

370.5K views2 months ago

2025’s Biggest Alien Discoveries (Part 2) | Ancient Aliens

1.1M views5 months ago

SHOCKING UFO MYSTERIES OF 2025 | Ancient Aliens *Full Episode Marathon*

834.5K views5 months ago

Are Aliens Spying on the U.S.? These Sightings Might Prove It | Ancient Aliens | History

764K views10 months ago

Chilling Evidence of ETs Among Us *Marathon* | Ancient Aliens

266.2K views1 month ago

Mysteries That Span Civilizations and Time | Ancient Aliens

282.8K views3 weeks ago

Uncovering the Truth: Giants, Alien Relics & The Human Experiment *Marathon* | Ancient Aliens

468.1K views9 months ago

Dark Encounters: Reptilians and Hidden Beings | Ancient Aliens

247.4K views1 month ago

Mysteries That Challenge Human Origins *Marathon* | Ancient Aliens

304K views1 month ago

Secrets Hidden in Antarctica and Beyond *Marathon* | Ancient Aliens

117.8K views2 weeks ago

Uncovering the Alien Genetic Blueprint | Ancient Aliens

136.9K views4 months ago

What Governments Know About Aliens | Ancient Aliens

884.7K views3 months ago

Ancient Aliens: TOP UFO MYSTERIES OF 2025 | Part 1

392.8K views5 months ago

Forbidden Caves Inside Antarctic Pyramids *Marathon* | Ancient Aliens

187.3K views3 weeks ago

The Hybrid Theory: Human or Alien? | Ancient Aliens | History

994.5K views6 months ago

Biggest Bible Revelations | Ancient Aliens | History

1.7M viewsApr 29, 2025

Extraterrestrial Moon Bases: Strange Evidence Explained | Ancient Aliens (S1, E11) | Full Episode

3.7M views10 months ago

The Afterlife: Myths vs. Facts | Ancient Aliens | History

416.8K views10 months ago

Ancient Aliens: Shocking Mysteries from Beyond *Marathon* | History

318.1K viewsApr 21, 2025

Powerful Alien Visitors Influence Our DNA (Season 15) | Ancient Aliens | History

43.9K views11 months ago

See more

Short videos

Veronica Cartwright remembers slapping Sigourney Weaver - Texas Frightmare

234.2K views5 months ago

FacebookAlien_Theory

Veronica Cartwright and Tom Skerritt share thoughts on Alien sequels and Prequels - Texas

7.1K views4 months ago

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EPSTEIN ALIEN ABDUCTION THEORY 😱 EP.280 ‪@jumpersjump‬

105.1K views1 month ago

YouTubeJumpers Jump

Don’t let the bed bugs bite… | Alien_Theory

359.2K views8 months ago

FacebookAlien_Theory

A while back I purchased the 25th anniversary collector’s set of the Alien Quadrilogy (with

1.6K views6 months ago

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Alien Theories S1E2

167 views4 months ago

YouTubedioptase’s awesome videos

Me on a date. (From Red Oaks S02E07) | Alien_Theory

7.6K viewsFeb 14, 2024

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Neil deGrasse Tyson: The "Photosynthesis Alien" Theory

123.1K views2 months ago

YouTubeCosmos Signals

Lance Henriksen on Reading the Aliens Script - Calgary Comic Expo 2014 |

26.6K views2 months ago

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Former CIA Reveals Secret Human-Hybrid Reality

10.6K views1 month ago

Former CIA Breaks Silence on Saurian Entities

11.7K views1 month ago

Alien 3 storyboard comparison: Capturing the beast | Alien_Theory

30.6K views4 months ago

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Are We Part of an Alien Hybridization Program?

6.9K views1 month ago

Ancient Alien Theory: Cosmic Mystery & Achievements

166 views2 months ago

YouTubeThe Observation Deck

Taking on Predator for the NES (warning: loud expletives/general whining) If

1.8K views10 months ago

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Aliens storyboard comparison: the dropship crash | Alien_Theory

79.3K views9 months ago

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Air Force Officer Reveals Nordic ET Autopsy

16.6K views4 months ago

Neil deGrasse Tyson's theory of why aliens are often portrayed as evil

16.5K views2 months ago

Do Aliens Secretly Influence World Leaders? A Global Mystery

53.2K views4 months ago

YouTubeBapuji Dashrathbhai Patel

A Theory of Everything Might Be Messy—But It Still Exists

20.5K views2 months ago

YouTubeStarTalk Plus