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. / Mungo finds half of a treasure map in the junkyard, and the Catillac Cats take off for the desert to search for the lost booty. There they run into Pecos, a cat prospector who just happens to have the other half of the map. It's a mad rush to get to the treasure first, but there's plenty of loot for all.