Tex is a young Tyrannosaurus who is now looking for a territory of his own. A bright light blinds him and knocks him out. When Tex wakes up, his whole world is different. New animals, new scents, and there don't seem to be any other dinosaurs. And the weirdest thing is that he seems to be followed by some... colorful mammals outside some weird nest.

Twilight, her friends, and her Dinosaur Ranger Team have been tracking dinosaurs for months now and taking them to their new home in Sauria. They've been stopping Merko and his men from catching any dinosaurs, but lately they seem to be getting better and have even seen some success. Things get even more heated when she gets a report of a massive theropod seen near her own school.

Trap Skinner and Merko have seeing some good success with dinosaur hunting. They've gotten their grip on some really good ones, but the newest one they've heard about may be their best catch yet. The duo is determined to claim this beast before Twilight and her friends can get it.