Littlefoot and his friends return in another adventure. But this time, they aren't the smallest dinosaurs in the valley...anymore.

Petit-Pied et ses grands-parents partagent une étrange "histoire de sommeil" qui les entraîne dans un voyage fabuleux! Toujours curieux, Céra, Pointu, Becky et Patrie s'empressent de les suivre. Au cours de cette aventure enchanteresse, ils découvrent plusieurs nouvelles créatures et des merveilles de la nature, et connaissent des dangers et de grandes joies! Ils finissent par rejoindre le plus grand rassemblement de dinosaures ayant jamais eu lieu, où se trouve un Long-Cou très spécial que Petit-Pied n'aurait jamais cru voir un jour!

Littlefoot befriends with a mysterious, fun-loving dolphin-like creature named Mo, who is trapped in "new water" caused by heavy rain. The gang then goes on an adventure to the "big water" to bring Mo home.

Littlefoot and his friends the gang in their next when a swarm of leaf gobblers had destroyed their homes and this forces them to find a new home but yet find an mysterious island.

Snow falls in the Great Valley for the first time, puzzling and enchanting everyone. The friends search for Spike after he leaves to search for his family.

A mysterious object crashes near the great valley, and Petrie's untrustful uncle arrives in search of it, believing it to be "a storm of cold fire", a susposed rock of great powers.

When Littlefoot's grandfather falls ill, the only way to cure him is with a flower from the forbidding land of the mists, which holds unexpected perils and danger.

When a sudden shortage of water threatens all life in the great valley, The gang of young dinosaur must cooperate with a group of bullies to make a risky journey outside the valley and find the cause.

Grandpa tells Littlefoot about their mythical hero called the Lone Dinosaur. Sarah gets two little lively cousins to take care of. Later, the kids accidentally chip the lucky Saurus Rock, and need to fix it before the bad luck hits.