 George SandersRobert Fleming | Robert Fleming |
 Lucille BallSandra Carpenter | Sandra Carpenter |
 Charles CoburnHarley Temple | Harley Temple |
 Boris KarloffCharles van Druten | Charles van Druten |
 Cedric HardwickeJulian Wilde | Julian Wilde |
 Joseph CalleiaNicholas Moryani | Nicholas Moryani |
 Alan MowbrayLyle Maxwell | Lyle Maxwell |
 George ZuccoH.R. Barrett | H.R. Barrett |
 Robert CooteDetective Wilson | Detective Wilson |
 Alan NapierDetective Gordon | Detective Gordon |
 Tanis ChandlerLucy Barnard | Lucy Barnard |
 Ann CodeeMatilda | Matilda |
 Jimmy AubreyNelson (uncredited) | Nelson (uncredited) |
 Jack ChefePierre (uncredited) | Pierre (uncredited) |
 Charles ColemanSir Charles (uncredited) | Sir Charles (uncredited) |
| AAlex FrazerProfessor Harkness (uncredited) | Professor Harkness (uncredited) |
 Gerald HamerHarry Milton (uncredited) | Harry Milton (uncredited) |
 Eddie ParksOswald Pickering (uncredited) | Oswald Pickering (uncredited) |
 Dorothy VaughanMrs. Miller (uncredited) | Mrs. Miller (uncredited) |
| SStuart HallCharles (uncredited) | Charles (uncredited) |
 Herbert EvansFleming's Butler (uncredited) | Fleming's Butler (uncredited) |
| SSam HarrisOld Man at Concert Asking for Whiskey (uncredited) | Old Man at Concert Asking for Whiskey (uncredited) |
 Isabel La MalDowager Shushing Fleming at Concert (uncredited) | Dowager Shushing Fleming at Concert (uncredited) |
 Marjorie HoshelleRobert's Rejected Girlfriend (uncredited) | Robert's Rejected Girlfriend (uncredited) |
| CCharles FergusonMan in Dance Hall (uncredited) | Man in Dance Hall (uncredited) |
 Ethan LaidlawMan in Dance Hall (uncredited) | Man in Dance Hall (uncredited) |
 Mike LallyMike (uncredited) | Mike (uncredited) |
 Ethelreda LeopoldBlonde Nightclub Singer (uncredited) | Blonde Nightclub Singer (uncredited) |
 Annette WarrenBlonde Nightclub Singer (uncredited) | Blonde Nightclub Singer (uncredited) |
| MMary Jane FrenchNightclub Patron (uncredited) | Nightclub Patron (uncredited) |
