Uploaded August 2026 | Updated September 2026, 2 weeks ago

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A mysterious metallic object captured by a thermal camera during a border protection patrol over Puerto Rico sparks questions about the true nature of unexplained aerial phenomena. See more in this clip from Season 18, Episode 11, "Alien A.I."

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"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.

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