Separated from his own species as a hatchling and raised on an island paradise by a clan of lemurs, Aladar's life is plunged into chaos when a devastating meteor shower forces him to join a group of migrating dinosaurs desperately searching for a safe nesting ground. With water and food in short supply and vicious carnotaurs posing an ever-present threat, Aladar challenges the unchanging ways of the herd and attempts to show how adaptability can be the best path toward survival.