Littlefoot and his young friends Cera, Ducky and Spike are being harassed by a group of older dinosaurs led by Hyp. When a meteorite strikes nearby, it causes a drought. The resulting scarcity of resources creates animosity among the different species in the Great Valley. Littlefoot and his crew resolve to venture forth to find a solution - as does Hyp and his gang. Will the groups learn to cooperate, or will their rivalry destroy them?