A young and ambitious engineer named Švajcar arrives at the family of a businessman as the fiancé of the factory owner's daughter. He meets his father-in-law's brother Cyril, who pretends to be invisible. The family plays this game with him so that they don't have to put him in an institution.
| Actor | Role |
|---|---|
 Luděk MunzarPetr Švajcar | Petr Švajcar |
 Jaroslava TvrzníkováSoňa | Soňa |
 Iva JanžurováKaty | Katy |
 Rudolf HrušínskýCyril | Cyril |
 Leopolda DostalováAunt Karolína | Aunt Karolína |
 Bohuš ZáhorskýHajn | Hajn |
 Zdeněk ŠtěpánekDoctor | Doctor |
 Zdeněk ŘehořNot listed | Not listed |
 Čestmír ŘandaNot listed | Not listed |
 Gustav NezvalNot listed | Not listed |
 František NěmecNot listed | Not listed |
| JJaroslav BartůněkNot listed | Not listed |
| JJosef KozaNot listed | Not listed |
| AAntonín KandertNot listed | Not listed |