Ancient Aliens: "Are We Alone?"

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Are we truly alone, or have extraterrestrials been guiding us all along? Learn more in this full episode marathon of "Ancient Aliens."

Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule.

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Subscribe for more from Ancient Aliens and other great The HISTORY Channel shows:
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