This is a major show in WML history, Bennett's first and only appearance before becoming a permanent panel member in 1951. Here he's just a one-time guest replacing the temporarily absent Hal Block. MYSTERY GUEST: Gloria Swanson PANEL: Dorothy Kilgallen, Louis Untermeyer, Arlene Francis, Bennett C
![What's My Line? - Cyril Ritchard; Robert Preston [panel] (Dec 22, 1957)](https://i.ytimg.com/vi/Tf_P3T14JsE/hqdefault.jpg)
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![What's My Line? - Steve Allen & Jayne Meadows; Martin Gabel [panel] (Dec 23, 1956)](https://i.ytimg.com/vi/yBmNV4Rx4sc/hqdefault.jpg)
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![What's My Line? - Guy Lombardo; Betty Furness & Garry Moore [panel] (Dec 31, 1950)](https://i.ytimg.com/vi/F7GW7dhealA/hqdefault.jpg)
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![What's My Line? - Sid Caesar; Martin Gabel [panel] (May 19, 1963)](https://i.ytimg.com/vi/JR784-Bw49g/hqdefault.jpg)
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![What's My Line? - Kirk Douglas; Peter Lind Hayes [panel] (Dec 20, 1953)](https://i.ytimg.com/vi/KFfrB7SCZYw/hqdefault.jpg)
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![What's My Line? - Richard Boone; Van Heflin [panel] (Jan 18, 1959)](https://i.ytimg.com/vi/l-gvf0zeaOs/hqdefault.jpg)
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