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The Castaways wonder what the cause is when the Skipper (Alan Hale Jr) starts itching and sneezing uncontrollably. Eventually, however, the awful truth is revealed: The Skipper only goes into his sneezing fits whenever Gilligan (Bob Denver) shows up, indicating that the old boy is allergic to his first mate. In desperation, the Professor (Russell Johnson) cooks up a potential cure for the Skipper's allergy, but it fails disastrously. All ends well, however, when it is discovered that the fault lies not with Gilligan but with his hair--or rather, what's in his hair.