After a catastrophic crash, pilot Mills finds himself trapped on a strange planet.However, he soon realized that this planet turned out to be the Earth - a prehistoric earth 65 million years ago.In this wild and unknown land, the only chance of escape is out of reach.In order to survive, Mills must fight side by side with the only survivor, Koa, through the crisis-ridden primitive jungle, strive to survive in an environment surrounded by prehistoric beasts, and embark on a shocking battle of survival.