Viktor Dobrovolsky

Makar Nechay

Valentyna Ivashova

Galya

Anton Dunaiskyi

Panas Timofeyich

Vasiliy Zaychikov

Aleksey Adamov

Fyodor Dubrovskiy

Academician Stepan Olenin

Nina Alisova

Natalya Stakhova, Adamov's aspirant

Aleksey Maksimov

Ilya Vladimirov, graduate student

Georgiy Kurovskiy

Professor Ivan Gorskiy

Ivan Sadovskyi

Professor Ivan Golovin

Garen Zhukovskaya

American lady (uncredited)

Volodymyr Lisovskyi

Trofim (uncredited)