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Two young dinosaurs from opposite sides of the floodplain bump into each other by chance. He's a small meat-eater, and she's a big plant-eater. They've got no parents, no food, no friends. They're supposed to be enemies, but they decide to stick together instead. It's not easy. When she gets caught with him, she ends up banished from her herd. He faces a huge rival who could stomp him out with one back foot. They have to outsmart a gang of predators who have sharp teeth and long, curved claws. And they struggle to overcome drought, mudslides and a bubbling tar pit. Worst of all, when they lose contact with each other, they fear betrayal. What if their bond has been broken?