Spencer TracyRoss 'Mac' McBride aka Danny Ross Ackerman William Harrigan'Doc' Evans Robert GlecklerSteve Arnold Robert WarwickRobert W. Wadsworth Paul StantonJustice Department Chief Hughes Wade BotelerDetective Humphries Lillian LeightonAunt Jane William IngersollDr. Williams Sam WoodDirector / Producer Howard Emmett RogersScreenplay Cedric GibbonsArt Direction James Wong HoweDirector Of Photography Dolly TreeWardrobe Master Edward WoehlerAssistant Director Douglas ShearerRecording Supervision William AxtOriginal Music Composer Edward WardOriginal Music Composer 
