Chomper's cave starts leaking, so the gang searches for a new cave Chopper can stay in while he lives in the valley.

Littlefoot's father and Shorty travel to the Great Valley to give Littlefoot the news that he will be taking the "Big Longneck Test", a three-stage test to see if a Longneck is capable of leading a herd. Meanwhile, Shorty tries to lead Littlefoot's friends on an adventure.

A freeze has come to the Great Valley, so Mr. Thicknose decides to tell everyone about a mysterious treat known as Hard Water Sweets (which are frozen grapes). The gang desires to taste this treat, so the embark on a journey to find them.