Dinosaurs were wiped out sixty-five million years ago. But what if they weren't? What if they had survived and evolved alongside humans? What then? What would they grow up to become? Jack Pennywise wakes up on a tropical beach with little recollection of how he got there. The last thing he remembers is being in a time machine, on his way from 65 million BC-the time of the dinosaurs-back to the present. When they arrive, Jack and his friends quickly realize that something is very wrong with the world. According to the time machine, they are in the present, but they are still seeing dinosaurs. How could that be possible? And as if that weren't bad enough, the time travelers soon run into something much worse than dinosaurs; something they created by changing the past. The group quickly finds themselves in a fight for their lives, as they struggle to figure out how they could have changed the past so drastically, and if there is any way that they can undo it...