Grandpa regales Littlefoot and his prehistoric pals with "a great adventure and a good story" about the legend of the Lone Dinosaur and Saurus Rock, which watches over the Great Valley. Should anything happen to it, Grandpa tells them, bad luck will befall the Great Valley....
The twins, Dinah and Dana, run away to find the legendary and magical Saurus Rock and the other young dinosaurs go to find them.
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