Regimantas Adomaitis as Sergei Lazo

Yuriy Dubrovin as Korolyov

Tatyana Makhova as Sofia Nikolayevna

Viktor Markin as

Zinaida Slavina as

Ion Ungureanu as

Vsevolod Yakut as

Konstiantin Artyomenko as

Aleksandra Zavyalova as

Andrei Tarkovsky as Military Officer (uncredited)