Arthur Lubin Director Brenda Joyce Jean Kingsley Actor Gale Sondergaard Miss Zenobia Dollard Actor Kirby Grant Hal Wentley Actor Milburn Stone Mr. Moore Actor Rondo Hatton Mario the Monster Man Actor Hobart Cavanaugh Bill Stapleton Actor Ruth Robinson Mrs. Wentley Actor Adda Gleason Martha Actor Eric Taylor Screenwriter Howard Welsch Producer Paul Ivano Cinematographer Ray Snyder Film Editing John B. Goodman Art Director Abraham Grossman Art Director Russell A. Gausman Set Decoration Ralph Warrington Set Decoration