Spike's friend Tippy and his spiketail herd return to the Great Valley, but there's not enough green food to go around. The adults' tempers flare, and Spike and Tippy are forbidden to be together. So when Ducky discovers Spike and Tippy sneaking off to play, she's not sure what to do!

Tiny, crab-like Sand Creepers have invaded the Great Valley - and they're driving everyone crazy! Ducky has her work cut out for her as she tries to protect the Creepers from all of the larger dinosaurs in the Valley. Meanwhile, Littlefoot and the other kids find themselves completing increasingly difficult tasks while trying to convince a cranky old Sand Creeper to lead the other crabs out of the Great Valley.