A "Carnotaurus" attacks a herd of dinosaurs, destroying an "Iguanodon" nest. The lone surviving egg is stolen by smaller predators, and, after a series of mishaps, is dropped on an island inhabited by prehistoric lemurs. Plio; the daughter of their patriarch Yar, names the hatched baby Aladar and raises him alongside her daughter Suri, despite Yar's initial objections. Several years later, a fully grown Aladar watches the lemurs take part in a mating ritual, in which Plio's brother Zini is unsuccessful. Moments after the ritual ends, they are interrupted by a meteor crashing into the Earth, creating an explosive shockwave which destroys the island. Aladar and Yar's family flee across the sea to the mainland. Being the only survivors, they mourn the others, before moving on.