Vladimir Gardin

Professor Shakhrov

Nikolay Kutuzov

Kuznetsov

Yevgeniya Pyryalova

Zhenya Maltseva

Boris Azarov

Zaretskiy

Nikolai Michurin

Factory worker (uncredited)

Vladimir Romashkov

Scientist (uncredited)

Vladimir Chobur

Komsomol member (uncredited)