
The movie starts with 3 people, a paleontologist and his niece and nephew, driving in a forest in Alaska.

The island is destroyed by Titans lava used a meteor shower, forcing Aladar and his friends to flee to the mainland, where they encounter a herd of dinosaurs led by the ruthless Kron. Their enemy is a Gorgosaurus named Gorgon, a fearless hunter. Their story is related by Alex the Alexornis who has a symbolic relationship with the trio. Set in North America in the late Cretaceous period, the film follows the lives of three Pachyrhinosaurus named Patchi, Scowler and Juniper from infancy to adulthood.
