Heathcliff and the Catillac Cats

The Great Tuna Caper [Heathcliff] (1x117)

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Heathcliff, eating the Nutmeg's out of house and home, is sent out to earn his own tuna money. He lands a job on a tuna boat where he tangles with the bad dog from a nearby pirate trawler who has just stolen their entire catch.