Crashed UFOs. Recovered alien entities. Secret programs. For decades, incredible claims have been made about an extraterrestrial presence on Earth--and the government has gone to great lengths to discredit them in Season 20, Episode 13, "THE WHISTLEBLOWERS." Watch all new episodes of Ancient ...

This information about alien life on distant planets may surprise you. See more in this compilation from 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. ...

For thousands of years, cultures around the world have held a belief in stargates through which beings have traveled to Earth from distant points in the universe and even other dimensions. See more in this scene from Season 20, Episode 12, "Unlocking the Stargates." Watch all new episodes of ...