A biographical film about the life of the great Russian scientist, inventor of rocket technology and the founder of theoretical astronautics — Konstantin Tsiolkovsky, the hard spiritual work of the thinker, overcoming the stagnation of the surrounding and dramatic events of his family life.
| Actor | Role |
|---|---|
 Yevgeny YevtushenkoTsiolkovsky | Tsiolkovsky |
 Larysa KadochnykovaVarvara Yevgrafovna | Varvara Yevgrafovna |
 Albert FilozovPanin | Panin |
 Elena FinogeevaLyuba | Lyuba |
 Kirill ArbuzovIgnatiy | Ignatiy |
 Vadim AleksandrovTailor | Tailor |
 Georgi BurkovRokotov | Rokotov |
 Ion UngureanuPriest | Priest |
| VVladimir SedovYevgraf Nikolaevich | Yevgraf Nikolaevich |
 Vladimir ErenbergTrustee | Trustee |
 Olga BarnetTrustee's Wife | Trustee's Wife |
 Sergei NasibovDmitri | Dmitri |
 Marina YakovlevaTanya | Tanya |
 Sergei BondarchukNarrator (voice) | Narrator (voice) |