O Fatídico Caso do Doutor Rx

Patric Knowles Private Detective Jerry Church Lionel Atwill Dr. Fish Anne Gwynne Kit Logan Church Mantan Moreland Horatio B.Fitz Washington Samuel S. Hinds Dudley Crispin Mona Barrie Eileen Crispin Shemp Howard Det. Sgt. Sweeney Paul Cavanagh John Crispin Edmund MacDonald Det. Capt. Bill Hurd John Gallaudet Ernie Paul William Gould Dist. Atty. Mason Leyland Hodgson Thomas, the butler Matty Fain Tony Zarini Mary Gordon Mrs. Scott