Several scientists create drama around a mysterious black ball.
| Actor | Role |
|---|---|
 Nikolai KarachentsovNot listed | Not listed |
 Boris NikiforovNot listed | Not listed |
 Vladimir ShurupovNot listed | Not listed |
 Yevgeni GerasimovNot listed | Not listed |
 Yevgeni KindinovNot listed | Not listed |
 Igor KvashaNot listed | Not listed |