Ancient Aliens: EXTRATERRESTRIAL COLONIZATION OF EARTH (Season 13) | History

Watch new episodes of Ancient Aliens Saturdays at 9/8c, and stay up to date on all of your favorite History Channel shows at https://history.com/schedule. Although we may be far from colonizing space, ancient astronaut theorists believe extraterrestrials might have colonized earth many years ago, in this clip from Season 13, "Return to Mars". #AncientAliens Subscribe for more from Ancient Aliens and other great HISTORY shows: http://histv.co/SubscribeHistoryYT Find out more about the show and watch full episodes on our site: https://histv.co/AncientAliens Check out exclusive HISTORY content: History Newsletter: https://histv.co/newsletter Website - https://histv.co/History Facebook - https://histv.co/Facebook Twitter - https://histv.co/Twitter "Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years. HISTORY® is the leading destination for award-winning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across all platforms. The network’s all-original programming slate features a roster of hit series, premium documentaries, and scripted event programming.