Six years old boy decides to start school and going by himself to first grade instead of kindergarten.
| Actor | Role |
|---|---|
 Kirill Golovko-SerskyGleb | Gleb |
 Pavel GayduchenkoKosta Korolkov | Kosta Korolkov |
 Marina YakovlevaNatasha Alyabina | Natasha Alyabina |
 Igor KvashaArkadiy Borisovich - Doctor | Arkadiy Borisovich - Doctor |
 Valentina TalyzinaGrandmother of Kostya Korolkov | Grandmother of Kostya Korolkov |
 Yevgeni GerasimovGleb's father | Gleb's father |
 Georgiy ShtilGnesik | Gnesik |
 Raisa RyazanovaGalina Pavlovna - Mother of Kostya Korolkov | Galina Pavlovna - Mother of Kostya Korolkov |
 Yuriy SolominMr. Gleb | Mr. Gleb |
 Vakhtang KikabidzeSpy | Spy |
| AAleksandr DelibashNot listed | Not listed |
 Natalya GolovkoNot listed | Not listed |