The young Soviet biologist is forced to contend with ... agents of imperialist intelligence. But, as befits a Soviet citizen, he steadfastly fights against the machinations of the enemy and emerges victorious.
| Actor | Role |
|---|---|
 Aleksandr DemyanenkoNot listed | Not listed |
 Pavel LuspekayevNot listed | Not listed |
 Algimantas MasiulisNot listed | Not listed |
 Marina Yurasovaдама в ложе оперы | дама в ложе оперы |
 Gennadi PolokaNot listed | Not listed |
 Steponas KosmauskasNot listed | Not listed |
 Natalya ZhuravelNot listed | Not listed |
 Gennadiy NilovNot listed | Not listed |
| Marina YurasovaNot listed | Not listed |
 Vakhtang TumanovNot listed | Not listed |