In Search of Aliens: Proof that Humans are Not Alone ( S1, E10), Full Episode

Ancient Astronaut Theory has existed in popular culture for nearly 50 years, asking the question whether extraterrestrials visited Earth in the remote past. Find out more in Season 1, Episode 10, The Alien , InSearchOfAliens Subscribe for more HISTORY: Check out exclusive HISTORY content: History Newsletter Website Facebook Twitter 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 networks alloriginal programming slate features a roster of hit series, premium documentaries, and scripted event programming.