Charles Vigne, a wealthy banker, frees Abdul, a good genius imprisoned in a vase. To thank him, Abdul grants his wish: to become a child again, while retaining the experience he has acquired. But the "disappearance" of the banker panics the financial markets and has disastrous consequences for the bank. Eventually, Charles Vigne will ask Abdul to give him back his real age.
| Actor | Role |
|---|---|
| JJules BerryCharles Vigne | Charles Vigne |
 Suzet MaïsMathilde Vigne | Mathilde Vigne |
 Jean TissierGégène | Gégène |
 Saturnin FabreAbdul | Abdul |
| PPaul AzaïsPaulo | Paulo |
 SinoëlGédéon | Gédéon |
 René AliéNot listed | Not listed |
| CChristian ArgentinVilmotte | Vilmotte |
| CClaude BertinCharles Vigne junior | Charles Vigne junior |
| LLucien BlondeauAntique dealer | Antique dealer |
| FFélix ClodyNot listed | Not listed |
 Max Dalban'P'tit Louis' | 'P'tit Louis' |
| OOlivier DarrieuxBandit | Bandit |
| PPhilippe DehesdinNot listed | Not listed |
| MMonique DuboisYvette | Yvette |
 Lucas GridouxProducer | Producer |
 Grégoire GromoffNot listed | Not listed |
| LLucien GuervilNot listed | Not listed |
 Pierre JuvenetBajaudel | Bajaudel |
| LLucien LambrayNot listed | Not listed |
| SSerge LecointeNot listed | Not listed |
| PPaul LluísPsychiatrist | Psychiatrist |
 Franck MauriceNot listed | Not listed |
 Arlette MerryMartine | Martine |
| HHuguette MontréalNanny | Nanny |
 Robert MoorDoctor | Doctor |
| RRené PascalNot listed | Not listed |
 Jacqueline PlessisClient | Client |
 Jacques RousselShareholder | Shareholder |
 Pierre SergeolA bandit | A bandit |