Several scientists create drama around a mysterious black ball.

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Main Cast: Nikolai Karachentsov, Boris Nikiforov, Vladimir Shurupov, Yevgeni Gerasimov, Yevgeni Kindinov, Igor Kvasha

Director: Aleksey Solovyov

Writers: Arkadiy Strugatskiy, Aleksey Solovyov

Editor: Ludmila Ruban

Cinematographer: Ernst Gaman

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