It is the dawn of time, the land of the dinosaur. Lost and alone, Littlefoot and his friends are about to embark on the journey of a lifetime.

An orphaned brontosaurus named Littlefoot sets off in search of the legendary Great Valley. A land of lush vegetation where the dinosaurs can thrive and live in peace. Along the way he meets four other young dinosaurs, each one a different species, and they encounter several obstacles as they learn to work together in order to survive.