During the
age of the dinosaurs, a
famine forces groups of dinosaurs to look for an
oasis known as the Great Valley. A "
longneck" dinosaur hatches a single baby named Littlefoot. Years later, Littlefoot encounters and plays with Cera, a young "
three-horn" dinosaur until she has her father send him away. In the evening Littlefoot plays with Cera again until a large "
sharptooth" dinosaur pursues them. Littlefoot's mother eventually comes to their rescue but is fatally wounded. During the struggle, an
earthshake strikes and splits the land, swallowing up the sharptooth and dividing Littlefoot, Cera, and other dinosaurs from their herds; several die in the process. Before dying, Littlefoot's wounded mother gives him some words of advice about finding the Great Valley: "let your heart guide you. It whispers, so listen closely". Confused, and in-grief, Littlefoot meets Rooter, an old "
clubtail" who is initially hostile towards him, but proceeds to console him after he opens up about his mother. Littlefoot is then guided by his mother's voice telling him to follow the sun to the Great Valley. First, he must pass several landmarks, such as a rock formation that resembles a
Longneck and the "
Mountains that Burn". Later on, Littlefoot meets a young "
bigmouth" dinosaur named Ducky and a young "
flyer" dinosaur named Petrie, themselves separated from their families during the earthshake, who accompany him on his journey. Looking for her own kind herself, Cera finds the unconscious sharptooth inside a ravine and inadvertently wakes him up. She escapes and bumps into Littlefoot, Ducky, and Petrie. While describing her encounter, she accidentally flings Ducky in the direction of a lone hatching "
spiketail" egg, from which a male emerges; Ducky names the hatchling "Spike" and inducts him into the group. Seeking the Great Valley themselves, Littlefoot and the others discover a cluster of trees, which is depleted by a herd of longnecks. Searching for remaining growth, they discover a single leaf-bearing tree, and obtain food by stacking atop each other and pulling it down. Cera remains aloof, but at nightfall, she and everyone else gravitate to Littlefoot's side for warmth and companionship. The next morning, Littlefoot and the group are attacked by the sharptooth but manage to escape through a tunnel which is too small for him to follow. They discover the landmarks mentioned by Littlefoot's mother. At the Mountains that Burn, a clash between Littlefoot's intention to follow his mother's directions and Cera's insistence on leaving the group results in a fight between them which causes the others to follow Cera, forcing Littlefoot to continue alone. When Ducky and Spike become endangered by
lava, and Petrie gets stuck in a
tar pit, Littlefoot returns to rescue them. Cera gets ambushed by a group of "
domeheads" who live in the Mountains that Burn; the rest of the group pose as a tar monster, scaring away the domeheads and frightening Cera. After realizing who it really is, Cera angrily leaves the group and breaks down in tears, ashamed of her selfishness. Later, while crossing a pond, Petrie overhears the sharptooth nearby. The group devises a plan to lure him to the pond and drown him in the deep side using a nearby boulder. During the ensuing struggle, a draft from the sharptooth's nostrils enables Petrie to fly for the first time. The plan nearly fails when the sharptooth begins attacking the boulder while the group attempts to push it onto him. However, Cera, having overcome her sorrow, reunites with the group and headbutts the boulder, causing the sharptooth to fall into the water, the boulder crashing into him in the process. The sharptooth momentarily takes Petrie down with him, but Petrie emerges unharmed while the sharptooth has drowned. Littlefoot, alone and about to give up on the search, sees his mother as a cloud; she guides him to the Great Valley, and Littlefoot is then joined by the others, who realize he was the same person who met them before. After arrival, the five are reunited with their families: Petrie impresses his family with his newfound flight; Ducky introduces Spike to her family, who adopt him; Cera reunites with her father; and Littlefoot finds his grandparents. The group reunites at the top of a hill and embrace each other in a hug. == Cast ==