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Higgins (John Hillerman "volunteers" Magnum (Tom Selleck) to act as bodyguard for "Sir Algernon Farnsworth", a disagreeable terrier owned by wealthy Gloria Marston (Kathleen Nolan). Though the last thing Magnum wants to be in the world is a dog-sitter, he agrees to the assignment in exhange for a year's free use of the tennis courts at a ritzy private club. But he may not live long enough to enjoy this perk: the dog's previous owner, an ill-tempered gangster named DiGiorgio (Michael Gazzo), is determined to reclaim the mutt--even if he has to kill a few people to meet his goal. The episode's climax finds DiGiorgio and his goons chasing Magnum and animal regulations officer Sharon Karns (Shawn Hoskins) through an old banana field. . .which turns out to be reaping some rather strange "fruit."