Peter Ohlsen, a perpetual student, leads a dissolute life and has been living off his filthy-rich father for years. When Peter comes home drunk from a party with his friends yet again, he finds a three-year-old boy in his bed who had been left with his housekeeper along with a letter. The letter states that Peter is the boy’s father and that he is hereby entrusted with the child’s upbringing.
| Actor | Role |
|---|---|
 Heinz RühmannPeter Ohlsen, Student | Peter Ohlsen, Student |
 Albert FlorathLudwig Ohlsen, Peters Vater | Ludwig Ohlsen, Peters Vater |
 Carola HöhnKathrin Gebhardt, Kindergärtnerin | Kathrin Gebhardt, Kindergärtnerin |
 Rudolf SchündlerPeters Freund | Peters Freund |
 Wolf AckvaPeters Freund | Peters Freund |
 Ursula GrableyNina, Peters Freundin | Nina, Peters Freundin |
 Ilse StobrawaMagret | Magret |
 Rolf von NauckhoffFreund von Peter | Freund von Peter |