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The blueprints of THRUSH's new Sonic Propulsion weapon have been recorded in a microdot and hidden in a piece of cheese. Alas, the cheese is promptly eaten by Stanley Umlaut (Dom DeLuise) a bumbling "master impostor." UNCLE agents April and Mark must rescue Stanley before he can be operated on by THRUSH kingpin Ole Bergman (Lloyd Bochner). Among the familiar faces in the supporting cast are Virginia Gregg as Granny, Ivan Triesault as Professor Voltan, and Fritz Feld as the Chef. First telecast on October 25, 1966, "The Danish Blue Affair" was written by Arthur Weingarten.