Vladimir Gardin

Professor Shakhrov

Nikolay Kutuzov

Kuznetsov

M. Tulupov

Professor Yaroshevskiy

Khakim Davletbekov

Khakim

Yevgeniya Pyryalova

Zhenya Maltseva

Boris Azarov

Zaretskiy

Kheyhana Tastakhova

Young kazakh woman

Sergey Golubev

Telegraph operator

Viktor Zakharov

Guryev, student (uncredited)

Nikolai Michurin

Factory worker (uncredited)

Vladimir Romashkov

Scientist (uncredited)

Vladimir Stukachenko

Factory worker (uncredited)

Vladimir Chobur

Komsomol member (uncredited)