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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.

The popular history docuseries Ancient Aliens: Origins returns to the History Channel with its season two premiere Monday, Oct. 6 at 8/7c. During the season two premiere episode, viewers will travel ...

As the long-running HISTORY Channel series “Ancient Aliens” begins its live tour, we get a preview from series favorite Giorgio Tsoukalos, a leading expert on Ancient Astronaut Theory, which contends ...

Complete episode list, ratings, and streaming details for Ancient Aliens Season 15.