The Pigeon Sisters (Monica Evans as Cecily and Carole Shelley as Gwendolyn, reprising their roles from the Broadway stage play and film) made four appearances during the first season. The sisters were never seen after that, but were occasionally mentioned later on. Oscar gained a steady girlfriend during that latter part of the first season and half of the second, Dr. Nancy Cunningham (portrayed by Joan Hotchkis), an attractive doctor, whose colleague, Dr. Melnitz (played by Bill Quinn in several episodes), is a curmudgeonly and sarcastic older physician who treats both Felix and Oscar. Felix also gained a girlfriend in the third season, Miriam Welby (played by Elinor Donahue), and they lasted into the fifth season, presumably breaking up before Felix remarried Gloria in the series finale. Christopher Shea appeared in three episodes of the first season as Philip, Felix and Oscar's 11-year-old neighbor. Oscar's occasional good-time girlfriend, "Crazy Rhoda Zimmerman", is often referred to but never appears onscreen.