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Hawkeye (Alan Alda) and Trapper (Wayne Rogers) are just about to depart for some much-needed R & R when they are summoned to attend a POW exchange between the U.S.A. and the Communists. Heading deep into enemy territory, the two doctors, accompanied by Frank (Larry Linville), Radar (Gary Burghoff), and Klinger (Jamie Farr), can only cross their fingers and hope that everything goes off without a hitch. What they don't count on is that the paranoid Frank has a very itchy trigger finger. Singer/composer Loudon Wainwright III makes his first series appearance as Captain Spalding. "Rainbow Bridge" was originally telecast on September 17, 1974.