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An exhausted Rob (Dick Van Dyke) pays but scant attention to Laura (Mary Tyler Moore) on his day off, convincing Laura that Rob has grown tired of her. Next-door neighbor Millie (Ann Morgan Guilbert) suggests a sure-fire method to win back Rob's affections. All Laura has to do is dye her hair blonde! Unfortunately, Millie runs out of coloring before the dyeing job is completed, leaving Laura's hair looking like a Rand-McNally map of Europe! Although "The Blonde-Haired Brunette" was the ninth Dick Van Dyke Show filmed, the producers decided to move it up to the second episode telecast to show off the peerless comic skills of their "new discovery," Mary Tyler Moore.