Today, more people than ever before believe that Unidentified Flying Objects are of alien origin. But if extraterrestrials have come to Earth from light-years away, could they be capable of bending both time and space? Might it even be possible that the UFOs in our skies are not visitors from other planets, but from our own future?

Ancient Aliens has followed investigators across the globe as they've gone directly to the sites where unexplained incidents have been reported. Now, Giorgio Tsoukalos takes a look back at the most extraordinary encounters that, as far as he's concerned, provide evidence of an extraterrestrial presence on Earth.