Misha Yershov as Витя Середа

Aleksandr Grigoryev as Паша Козелков

Vladimir Savin as Миша Копаныгин

Vladimir Basov Ml. as Федя Лобанов

Olga Bityukova as Варя Кутейщикова

Nadezhda Ovcharova as Юля Сорокина

Irina Savina as Катя Панфёрова

Lev Durov as академик Филатов

Artyom Karapetyan as академик

Innokentiy Smoktunovskiy as И. О. О.

Vasili Merkuryev as академик Благовидов

Yuri Medvedev as академик Огонь-Дугановский

Pyotr Merkuryev as академик Курочкин

Natalya Fateeva as мать Паши Козелкова

Natalya Strizhenova as Лёля Козелкова

Ekaterina Voronina as врач на тренажёрах