Who are the beings with big heads and giant eyes that seem to have been visiting our planet for millennia? Known by researchers as the “greys,” these mysterious beings have been depicted in rock-art and carved stone figures throughout the ages and all over the world. See more in Season 2, Episode 7, “Visions of Aliens.”
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“Ancient Aliens” explores the controversial theory that extraterrestrials have visited Earth for millions of years.
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