The Land Before Time S01E16 - The Lone Dinosaur Returns
Summary:
When Doc, an older longneck that Littlefoot believes to be the legendary Lone Dinosaur, arrives unexpectedly, the kids are convinced he's there to drive Chomper but of the Great Valley. While Littlefoot tries to discover Doc's true intentions, Cera leads the other kids on a wacky journey in an attempt to hide the panic-stricken Chomper.