Casting
Владимир Гардин
Professor Shakhrov
Николай Кутузов
Kuznetsov
M. Tulupov
Professor Yaroshevskiy
Хаким Давлетбеков
Khakim
Евгения Пырялова
Zhenya Maltseva
Борис Азаров
Zaretskiy
Eliana Dugina
Young Kazakh girl
Kheyhana Tastakhova
Young kazakh woman
Сергей Голубев
Telegraph operator
V. Zakharov
Guryev, student (uncredited)
Николай Мичурин
Factory worker (uncredited)
Владимир Ромашков
Scientist (uncredited)