Banished into the Laramidian wilderness by their parents four young Tyrannosaurus brothers, Leviathan, Hannibal, Carnis, and Mansur, must find a way to survive on their own. In a harsh Cretaceous environment plagued by drought, volcanoes, marauding packs of Dakotaraptors, angry herds of Torosaurus, and cannibalistic Tyrannosaurs, only the strong will survive. Can the brothers beat the odds?