Several scientists create drama around a mysterious black ball.
| Writing | Arkadiy Strugatskiy | Writer |
| Directing | Aleksey Solovyov | Director |
| Writing | Marian Tkachov | Writer |
| Production | Igor Gelashvili | Producer |
| Camera | Leonard Kolvinkovskiy | Director of Photography |
| Sound | Aleksandr Zhurbin | Music |
