Cast
- Andrei Tolubeyev as Stepan Sergeyevich Shelagin
- Aleksei Nilov as Vitaliy Igumnov
- Aleksandr Barinov as Aleksandr Petrov
- Aleksandr Arzhilovskiy as Research worker
- Aleksandr Bespalyy as Mefodiy Soroka
- Anatoly Vedyonkin as Vasiliy Yevsyukov
- Oleg Golubitsky as Viktor Antonovich Bayannikov
- Lyubov Germanova as Katya Shelagina
- Valentina Egorenkova as Ninel Vladimirovna Starycheva
- Oleg Korchikov as Anatoliy Vasilyevich Trufanov