Loengrin Minaev

Arkadiy Zubov

Pyotr Grokhovskiy

Genya

Boris Runge

Lyova Prokushev

Lev Mirsky

Vitya Surikov

Dagmara Deringer

Lidochka

Yekaterina Derevshchikova

Katya

K. Gavrikov

Classmate

Grigoriy Aronov

Aronov, classmate

Anatoliy Ignatyev

Seryozha

Vera Altayskaya

Marusya Ivanova, pioneer leader

Pyotr Savin

Vladimir Vishnyakov, teacher

Lev Potyomkin

Arkadiy's father

Nina Rusinova

Arkadiy's mother

Andrei Tutyshkin

School headmaster

Olena Maksymova

Vitya Surikov's mother

Eduard Volodarskiy

Classmate

Anatoli Goryunov

Doctor (uncredited)

Aleksandr Sashin-Nikolsky

Friend of Surikov's mother