Get to know the surprising secret strengths and weaknesses of the incredible survival machines who ruled the Earth for 120 million years. Using cutting-edge technology, we take a new look at dinosaurs from the inside out and peel back their skin, their muscles and even their brains to reveal their unique inner workings. Then we find out who really was king of the prehistoric world as we see the greatest beasts who ever lived battle each other in startling life-like recreations. Episodes: Extreme Survivors, Perfect Predators, The Defenders and Generations. Extreme Survivors: With 120 million years of evolution, dinosaur bodies became better adapted to their environment than any mammal today. The latest science reveals the anatomical secrets that made them such incredible survivors. Perfect Predators: The Cretaceous Period spawned walking death machines with a savage combination of speed, eyesight and brainpower. As we see, massive size didn't always guarantee victory as some smaller dinosaurs were carrying a secret weapon or two. The Defenders: Predators didn't dominate the Cretaceous Period; plant eaters did. And their bodies were built to take a beating. The latest science reveals how the world's largest vegetarians became such successful survivors in a world of claws and teeth. Generations: Ever wonder about the love life of a dinosaur? You're about to learn all the dirt about millions of generations of successful coupling and evolutionary adapting to a changing planet.