Charles Lamont Director Bud Abbott Slim Actor Lou Costello Tubby Actor Boris Karloff Dr. Henry Jekyll, Mr. Hyde Actor Craig Stevens Bruce Adams Actor Reginald Denny Inspector Actor Helen Westcott Vicky Edwards Actor John Dierkes Batley Actor Henry Corden Actor in Javanese Costume Actor Marjorie Bennett Militant Woman on Soapbox Actor Carmen De Lavallade Javanese Actress Actor Howard Christie Producer Lee Loeb Screenwriter John Grant Screenwriter George Robinson Cinematographer Russell F. Schoengarth Film Editing Bernard Herzbrun Art Director Eric Orbom Art Director John P. Austin Set Decoration Russell A. Gausman Set Decoration Rosemary Odell Costume Design