Junior is a small, few month old T. rex, with a want to go exploring and be rebellious. He doesn't always conceive dangers, forgetting that he's not invincible. When harmed, or whatever other reason, he cries out for his parents. He's a hassle, but Doe and Buck love him anyway. They live in the Northern Forest, a rather easy-going and more livable part of the "Greaterous Forest." Which most of the dinosaurs in the Western United States reside in.