Why are humans so different from every other species on Earth? Did we evolve from apeor is our intelligence the result of contact with an otherworldly source? See more in this 3 hour marathon from Ancient Aliens.

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

HISTORY® is the leading destination for awardwinning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across all platforms. The network’s alloriginal programming slate features a roster of hit series, premium documentaries, and scripted event programming.