A Pup Named Scooby-Doo

Season 1, Episode 10: Ghost Who's Coming to Dinner?

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It's Halloween and the gang gets set out for trick or treating. At their friends the Johnsons' house, they learn that there is a real ghost living there. The ghost is a sweet one or so they think. The ghost of a long dead pirate comes demanding the Johnsons move away. The real ghost asks the gang to help save his house.