A young engineer, Štěpán Pavlík, dreams of becoming a cosmonaut.
| Actor | Role |
|---|---|
 Jiří MenzelŠtěpán Pavlík | Štěpán Pavlík |
 Radoslav BrzobohatýMastník | Mastník |
 Evelyna SteimarováKateřina Panýrová | Kateřina Panýrová |
 Jiří KodetPetr Málek | Petr Málek |
 František ŘehákSkalník | Skalník |
 Jan SchmidKarel Perout | Karel Perout |
 Lenka SkopalováNot listed | Not listed |
 Jana DolanskáNot listed | Not listed |
 Jan KanyzaNot listed | Not listed |
 Eugen JegorovNot listed | Not listed |
 Jana BřežkováNot listed | Not listed |
| KKarel NovákNot listed | Not listed |
| MMiloslav VajnarNot listed | Not listed |
 Helena RůžičkováNot listed | Not listed |
| VVáclav KaňkovskýNot listed | Not listed |
 Ladislava KozderkováNot listed | Not listed |
| JJan CmíralNot listed | Not listed |
 Jana HermachováNot listed | Not listed |
| JJosef ŠebekNot listed | Not listed |
| ZZdeňka RosolováNot listed | Not listed |
| MMiloš DrahotaNot listed | Not listed |
| AAntonín KlípaNot listed | Not listed |
| JJaroslav TomsaNot listed | Not listed |
| MMilan PěknýNot listed | Not listed |
| MMarián KleisNot listed | Not listed |
| KKarel FridrichNot listed | Not listed |
| JJiří PrůchaNot listed | Not listed |
| JJiří KnotekNot listed | Not listed |