Three kids from a coastal village in the Far North discover an old rifle in a cave. They learn about a national hero Guriy Gagarka and organize an expedition to gather more info on him.
| Actor | Role |
|---|---|
 Valentin GrachyovVasya Golovnin | Vasya Golovnin |
| BB. DorokhovAndrei | Andrei |
| AAleksandr PokrovskyStepa Brusnichkin | Stepa Brusnichkin |
| AA. ShmurakovaLyuda | Lyuda |
| VV. ZhukovEgor | Egor |
| VV. PrichisnyaevKostya | Kostya |
 Ekaterina Savinovateacher | teacher |
| AAndrei Petrovсaptain Golovin | сaptain Golovin |
 Aleksandr Susninpioneer leader | pioneer leader |
 Aleksei GribovSarvanov | Sarvanov |
 Mikhail GluzskiyChernyshev | Chernyshev |
 Gennadi YudinGuriy Gagarka | Guriy Gagarka |
 Aleksei AlekseyevStepan Golovin | Stepan Golovin |
 Yevgeni Teterinfrigate captain | frigate captain |
 Nikolay Grabbeofficer | officer |
 Georgy GumilevskyNot listed | Not listed |
 Igor BezyaevNot listed | Not listed |
| LLarisa MatveenkoNot listed | Not listed |
 Andrei TsimbalNot listed | Not listed |
 Yan YanakiyevNot listed | Not listed |
| AAleksei Pokrovsky(uncredited) | (uncredited) |
| NNikolai Polenkov(uncredited) | (uncredited) |
 Nikolai Rybnikov(uncredited) | (uncredited) |
 Nikolay Smorchkov(uncredited) | (uncredited) |
| GGeorgi Shapovalov(uncredited) | (uncredited) |