When Mom takes Dan to the farm, he finds some downy feathers and sets out to prove that they belong to the Compsognathus. Dan tells the story of how Time Traveler Cory and his trusty robot D.A.D. (Cory's Dad) go back to three ages of the dinosaurs (the Triassic, Jurassic, and Cretaceous) to find the T. rex and get a photo of it.