During an attack on a pack of Iguanodon, an egg is separated and ends up with the possession of a group of lemurs. The lemurs care for this egg and the young creature born from it, which they call Aladar (D.B. Sweeney). When meteorites hit Earth, Aladar and his family must leave their homeland. Away from home and as close to danger as they have ever been, they meet up with a huge group of dinosaurs, led by Kron (Samuel E. Wright) and Bruton (Peter Siragusa). All together they are trying to reach the nesting grounds, but it's not going to be easy.