A construction comedy about the labor struggle of two groups of workers in a Prague factory. The old group is led by the grinder Karhan, while the young group is led by his son. The struggle between the two groups leads to the emergence of socialist competition and cooperation, in which the old share their experience with the young, and the young share their new ideas.
| Actor | Role |
|---|---|
 František SmolíkFranta Karhan | Franta Karhan |
 Jaroslav MarešJarka Karhan | Jarka Karhan |
 Světla SvozilováKarhanová | Karhanová |
 Jindřich PlachtaFerda Fikejs | Ferda Fikejs |
| MMarie RintováFikejsová | Fikejsová |
| VVladimír ŘepaZáruba | Záruba |
 Jaroslav ZrotalPepíček Dvořák | Pepíček Dvořák |
 Vladimír KrškaTulach | Tulach |
 Rudolf DeylLojza | Lojza |
| JJiří KostkaZákora | Zákora |
 Václav Neužil st.Not listed | Not listed |
| ZZdeněk MartínekBohouš | Bohouš |
| BBohumil MachníkKlepáč | Klepáč |
 František HanusNot listed | Not listed |
| EEmil KavanMareš | Mareš |
| KKarel HovorkaNot listed | Not listed |
 Otomar KorbelářNot listed | Not listed |
 Josef HlinomazNot listed | Not listed |
| EEmil DleskNot listed | Not listed |
| SStanislav LužickýNot listed | Not listed |
| FFerdinand JarkovskýNot listed | Not listed |
 Karol L. ZacharNot listed | Not listed |
 Eman FialaNot listed | Not listed |
| JJán BzdúchNot listed | Not listed |
| JJosef HořánekNot listed | Not listed |
 Karel VavříkNot listed | Not listed |
 Ota MotyčkaNot listed | Not listed |
| RRudolf KutílekNot listed | Not listed |
 Miroslav SvobodaNot listed | Not listed |
 Alois DvorskýNot listed | Not listed |