Throughout history, there have been stories of flying serpents and fire-breathing dragons that descended from the sky, cross-cultural tales of the star ancestors that jumpstarted civilization on Earth, and even ancient lore describing otherworldly beings that interacted with humans in the remote past. Learn more in this clip from Season 1, Episode 13, "STRANGE VISITORS."

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

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