Pluto's Surprise Package
Pluto tries to bring in the mail, which gets more difficult when a package sprouts legs and tries to go swimming. Between the wandering turtle and the wind blowing the other mail around, Pluto's got quite a task ahead. And it's not made easier when both the letters and the turtle go off a large cliff.
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Pluto's Surprise Package (1949) is a animation movie. Starring Pinto Colvig. Rated 6.4/10 on TMDB. Watch it online free on ZapFlix.