Eighteen years ago, the prehistoric past collided with the present as time itself underwent a tremendous disruption, transporting huge swaths of the Cretaceous period into the twentieth century. Modern humanity found itself sharing the world with fierce dinosaurs. Desperate measures were taken, and the crisis appeared to be over. Until now. New dinosaurs appear, and a secret mission to the Moon discovers a living T Rex. As time unravels once more, Nick Paulson finds a time passage to the Cretaceous period where humans are barely surviving. As the asteroid set to end the reign of dinosaurs rushes toward Earth, Nick and his allies must survive a war between species and save the future as we know it.