Alvin and the Chipmunks (1983)

S1E3 Uncle Harry

A deceitful chipmunk named Harry shows up, pretending to be Alvin, Simon, and Theodore's long-lost uncle. He promises them that they can reunite with their mother if they help him earn enough money. However, the Chipmunks eventually discover that Harry is not their uncle at all. Instead, they learn that the money they’ve been earning is actually meant to pay off a debt to a carnival strongman to whom Harry has owed money for quite some time.