Being a tramp is not always a disadvantage. For example when there is a masquerade ball. Indeed wearing flea-ridden rags might just mean having donned a costume. This is what happens to two resourceful Brussels bums, La Cloche and Picolard, who manage to gain entry in a fancy-dress ball. Once there, La Cloche is mistaken by an oriental prince for a respected doctor. His mission will be to give care to a music-hall diva. Even more exciting, he is asked to vaccinate a whole troupe of showgirls. Trouble guaranteed.
| Directing | René Le Hénaff | Director |
| Writing | Étienne Arnaud | Writer |
| Writing | André Heuzé | Theatre Play |
| Production | Michel Monaco | Producer |
| Production | Mlle C. Olivier | Producer |
| Sound | Henri Verdun | Original Music Composer |
| Camera | Georges Asselin | Director of Photography |
| Camera | Maurice Delattre | Director of Photography |
| Editing | René Le Hénaff | Editor |
| Art | Maurice Colasson | Production Design |
| Art | Georges Wakhévitch | Production Design |
| Art | Maurice Colasson | Art Direction |
| Art | Georges Wakhévitch | Art Direction |
| Costume & Make-Up | Fred Cammans | Costume Design |
| Costume & Make-Up | Paul Pouleur | Costume Design |
| Production | Lucien Rigaux | Production Manager |