Biographical film story about the first Russian space explorer, inventor scientist, rocket-maker K. E. Tsiolkovsky.
| Actor | Role |
|---|---|
 Yuriy KoltsovKonstantin Eduardovich Tsiolkovsky | Konstantin Eduardovich Tsiolkovsky |
| VVera DikhtyarVarvara Efgrafovna | Varvara Efgrafovna |
 Yuri KrotenkoIgnat | Ignat |
 Nina MenshikovaLyuba | Lyuba |
 Yuri LyubimovBaburin | Baburin |
 Vladimir BalashovDorofeev | Dorofeev |
 Georgiy BudarovBalabanov | Balabanov |
 Yuri MedvedevChuprov | Chuprov |
 Vladimir TroshinMertsalov | Mertsalov |
 Zinoviy GerdtNot listed | Not listed |
 Nikita KondratyevNot listed | Not listed |
| AAleksandr LavrukhinNot listed | Not listed |
 Valeria MenikovskayaNot listed | Not listed |
 Lev PotyomkinNot listed | Not listed |
 Sergei TseitsNot listed | Not listed |
| MMasha SokolovaNot listed | Not listed |
| SSasha KotelnikovNot listed | Not listed |
 Vera Burlakova(uncredited) | (uncredited) |
 Vladimir Vanyshev(uncredited) | (uncredited) |
| VVioletta Dolskaya(uncredited) | (uncredited) |
 Lidiya Korolyova(uncredited) | (uncredited) |
 Yakov Lents(uncredited) | (uncredited) |
 Bruno Lyaush(uncredited) | (uncredited) |
 Vladimir Maruta(uncredited) | (uncredited) |
| NNikolai Mirtov(uncredited) | (uncredited) |