Meteorites near the Great Valley cause a drought that threatens the inhabitants' lives. Mr. Threehorn becomes incredibly protective of the remaining water and mean to the inhabitants, forcing Littlefoot and the others to set out to find more water. The group is pursued by a trio of teenage dinosaurs consisting of a
Hypsilophodon named Hyp, a
Muttaburrasaurus named Mutt, and a
Nodosaurus named Nod, who inadvertently cause Mr. Threehorn to think that Littlefoot is a bad influence. When Littlefoot and the others find a small lake, the bullies emerge and claim the waterhole for themselves, demanding that Littlefoot and the others keep silent about their discovery. Littlefoot and the others flee from the bullies, but during the pursuit, Hyp, Mutt and Nod are chased away by a
wasp, and the children discover the reason behind the blockage of the water source. Before they can return and tell the other inhabitants the truth,
lightning strikes a tree, igniting a
wildfire that spreads throughout the Great Valley. The dinosaurs barely make it to safety at the edge of the Mysterious Beyond. When the children tell the adults of their discovery, disagreements about what to do erupts among the adults. Hyp, Nod, and Mutt set out into the Mysterious Beyond on their own to get to the water first. Anticipating danger that Hyp and his cohorts have gotten into and recognizing commonality with them, Littlefoot and the others follow to help if necessary. It becomes so when Hyp mistakes a
tar pit for water and gets stuck in it. After Littlefoot and his friends haul Hyp out, the adults arrive and Hyp is harshly scolded by his father. Realizing that he has been acting no different than Hyp’s father and feeling sorry for Hyp, Mr. Threehorn kindly lectures Hyp's father on how Hyp is a bully from being mistreated. Afterwards, they all decide to work together to find the water. Before they can take further steps, the herd is attacked by a pack of
Velociraptors. The pursuit leads to a dam of boulders created by the meteorites that caused the drought. As the raptors and the adults battle, the children, including Hyp and his cronies, work together to break the dam. They all watch as the freed water washes away the raptors. The water also puts out the fires which are still burning in the valley. Finally, they manage to survive and land on the opposite bank. The herd returns to the Great Valley, but they discover that the fire has destroyed most of their green food. Luckily, the dinosaurs find the spots in the Great Valley where green food still grows. They proportionately move from one verdant area to another and share everything they find. This pattern results in the event being called the Time of the Great Giving. == Voice cast ==