Gennareniello, a crazy inventor, is married to Concettina and lives at home with his son Tommasino, full of tics, his spinster sister and with Matteo, a drawing master who makes plans for his inventions. Driven by his friends, the man courts the young teacher Anna and when his wife notices it, he is forced to run away from home, overwhelmed by the scorn of derision of friends and acquaintances who come to disguise him as a dandy, thus offending his dignity.
| Actor | Role |
|---|---|
 Eduardo De FilippoGennaro, pensionato | Gennaro, pensionato |
 Luca De FilippoTommasino, loro figlio | Tommasino, loro figlio |
 Pupella MaggioConcetta, sua moglie | Concetta, sua moglie |
 Marina ConfaloneFedora, sorella di Gennaro | Fedora, sorella di Gennaro |
| CChiara ToschiAnna Maria, bella ragazza | Anna Maria, bella ragazza |
 Luigi UzzoMatteo, maestro di disegno | Matteo, maestro di disegno |
 Marzio HonoratoMichele, giovane ingegnere | Michele, giovane ingegnere |
 Sergio Solli'O Russo, «saponaro» | 'O Russo, «saponaro» |