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Алексей Баталов as Dmitri Gusev |
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Иннокентий Смоктуновский as Ilya Kulikov |
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Татьяна Лаврова as Lyolya |
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Михаил Козаков as Valery Ivanovich |
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Николай Плотников as Professor Sintsov |
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Сергей Блинников as Butov |
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Евгений Евстигнеев as Nikolai Ivanovich |
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Валентин Никулин as young physicist |
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Павел Шпрингфельд as physicist |
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Люсьена Овчинникова as Nura, Gusev's younger sister |
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Андрей Смирнов as tall bearded physicist |
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Евгений Тетерин as Surgeon |
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Зиновий Гердт as Narrator (voice) |
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Viktor Lazarev as Guest at the wedding |
| Directing | Михаил Ромм | Director |
| Writing | Даниил Храбровицкий | Writer |
| Writing | Михаил Ромм | Writer |
| Editing | Ева Ладыженская | Editor |
| Art | Георгий Колганов | Production Design |
| Camera | Герман Лавров | Director of Photography |
| Sound | Ջոն Տեր-Թաթևոսյան | Original Music Composer |
| Directing | Лев Инденбом | Assistant Director |
| Directing | Даниил Храбровицкий | Assistant Director |
| Sound | Борис Вольский | Sound Director |
| Writing | Израиль Цизин | Script Editor |
| Costume & Make-Up | Валентина Киселёва | Costume Design |
| Costume & Make-Up | В. Фетисов | Makeup & Hair |
| Directing | Лика Авербах | First Assistant Director |
| Directing | А. Мкртчан | Second Assistant Director |
| Production | Игорь Вакар | Executive Producer |
