A long long time ago, the Earth was ruled by dinosaurs. They were big, so not a lot of people went around hassling 'em. Actually, no people went around hassling 'em cuz there weren't any people yet. Just the first tiny mammals. Basically, life was good. Then something happened: a giant meteorite struck the Earth. Goodbye dinosaurs! But what if the dinosaurs weren't all destroyed? What if the impact of that meteor created a parallel dimension where the dinosaurs continued to thrive and evolve into intelligent, vicious, and aggressive beings... just like us? And hey, what if they found a way back?