- Kirill Lavrov
- Andrei Bashkirtsev
- Ada Rogovtseva
- Natasha
- Igor Gorbachyov
- Evgeniy Ognev
- Andrei Popov
- Nikolay Logunov
- Igor Vladimirov
- Anatoliy Golovin
- Innokentiy Smoktunovskiy
- Konstantin Tsiolkovskiy
- Vsevolod Safonov
- Leonid Sretenskiy
- Zinoviy Gerdt
- Artur Kartashov
- Svetlana Korkoshko
- Zoya Konstantinova
- Petr Shelokhonov
- Mikhail Karelin
- Yuri Leonidov
- Morozov
- Igor Petrovsky
- (as I. Petrovsky)
- Andro Kobaladze
- Iosif Stalin
- Galiks Kolchitskiy
- Igor Kurchatov
- Lavr Lyndin
- First Cosmonaut
- Vera Kuznetsova
- Bashkirtsev's mother
- Evgeniy Matveev
- The Factory Director
- Vadim Spiridonov
- Captain Flerov
- Evgeniy Steblov
- Bashkirtsev's brother
- Boris Belyakov
- Constructor
- Nikolai Barmin
- Aviation General
- Valentina Khmara
- Secretary
- Ervin Knausmyuller
- General
- Yuri Gagarin
- Self
- Ibragim Bargi
- Kartashov's Assistant
- Anatoli Chelombitko
- Gagarin (in space suit)
- Vladimir Diyanov
- Alyosha
- Yuriy Kireev
- Soldier
- Vladlen Paulus
- Logunov's Assistant
- Ivan Ryzhov
- Alekseich
- Galina Samokhina
- (as G. Samokhina)
- Georgi Shevtsov
- (as G. Shevtsov)
- Mikhail Suvorov
- Guest at the Wedding
- Nozheri Chonishvili
- (uncredited)
- Aleksandr Degtyar
- Banqueter
- Georgiy Kulikov
- Sharov
- Lev Lobov
- Banqueter
- Yuriy Perov
- Member of GIRD
- Viktor Petrov
- Guest at the Wedding
- Igor Pushkaryov
- Natasha's Fiance
- Oleg Savosin
- Guest at the Wedding
- Aleksandr Smirnov
- Banqueter
- Ivan Turchenkov
- Guest at the Wedding
- Elena Volskaya
- Bride's Aunt
- Vladimir Vyazovik
- Member of GIRD
