The Towering pyramids of Egypt…the sprawling lines of Nazca, Peru…the creepy figures on Easter Island, besides tourism and deterioration, what do these extraordinary landmarks have in common? They’re all considered way too advanced to have been built by primitive cultures. Clearly, these prehistoric folks must have some help. And who better to lend a helping hand than a space alien? Some researchers believe ancient astronauts came here 450,000 years ago with a lot more than monument-building in mind. He also feels confident that the ancient astronauts will one day return – so look busy. We pit ancient astronauts against the modern science in a fight to the finish. Our entire past is at stake.