Surrounding the mystery of the oceans during the age of the dinosaurs, latest research has revealed that sea-dwelling creatures evolved in a completely different way than dinosaurs. How did Mosasaurs, the most powerful sea dinosaur reigning at the pinnacle of the dinosaurs, achieve a prosperity rarely seen in the history of life on earth? The key to solving this mystery lies within the way they raised their hatchlings! This film dives 30 million years back to depict the drama of the strongest sea dinosaur.