Theorists believe that thousands of years ago, extraterrestrials landed on Earth in the season 20 premiere of History Channel’s hit series “Ancient Aliens” set to air Thursday, January 15 at 9 p.m.

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: History Channel ...

The truth may be closer than you think. “The Proof Is Out There: Alien Edition” returns with brand-new episodes Thursday, Feb. 26 at 10 p.m. on History Channel, and this special edition is diving deep ...