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.

The "Flying Rocks of Many Nights" make Ruby concerned about her family's safety. Ruby decides she must make sure they're okay, and sets out into the Mysterious Beyond alone. But she has a hard time being alone when Ducky, Chomper and Spike decide to join her!