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Sweltering through another nocturnal Korean heat wave, the men and women of the 4077th seek out ways to keep cool--at least mentally. Charles (David Ogden Stiers), for example, labors over his income taxes, while Klinger (Jamie Farr) tries to repair the PA system. Alas, poor Margaret (Loretta Swit) is suffering from a prickly-heat rash--and before long, the whole camp is apprised of Margaret's embarrasingly itchy plight.