An ordinary Viennese taxi driver, Toni Kowalski, wanders into a diner, where a singing competition is taking place, and decides to take part in it. He is recognized as a maverick, the owner of an amazing voice, and is awarded the victory in the competition. Toni is patronized by an influential socialite.
| Actor | Role |
|---|---|
 Jan KiepuraToni Kowalski | Toni Kowalski |
 Friedl CzepaMizzi | Mizzi |
 Theo LingenDiener | Diener |
 Fritz ImhoffHeini Weidl | Heini Weidl |
 Luli DesteCorinne Dalma | Corinne Dalma |
 Anton PointnerFrank Dalma | Frank Dalma |
| AAnton NeugenbauerDer Operndirektor | Der Operndirektor |
| RRobert ValbergDer Rechtsanwalt | Der Rechtsanwalt |
| BBabette DevrientGroßmamma Sophie | Großmamma Sophie |
| MMaria MellGroßmamma Emma | Großmamma Emma |