Ancient Aliens: Area 51s Greatest Mystery (Season 20)

Crashed UFOs. Recovered alien entities. Secret programs. For decades, incredible claims have been made about an extraterrestrial presence on Earth--and the government has gone to great lengths to discredit them in Season 20, Episode 13, "THE WHISTLEBLOWERS."

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

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