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Doctor in the House is the twentieth episode of the sixth season of Three's Company, and the one hundred twentieth episode overall.
John Ritter (Jack Tripper),
Joyce DeWitt (Janet Wood),
Priscilla Barnes (Terri Alden),
Richard Kline (Larry Dallas) (credit only),
Jenilee Harrison (Cindy Snow)
Don Knotts (Ralph Furley)
Edward Andrews (Grandpa Tripper),
Keith Lawrence (Dr. Phillips),
Toni Lamond (Patient)
Behind the Scenes
Allusions and References