Three boys are helping Soviet Intelligence to catch German spies during WWII.
Sasha Grigoryev
as Mishka Alekseyev
Igor Urumbekov
as Vaska Kozhukh
Владимир Лелётко
as Styopka Panfilov
Павел Луспекаев
as Ivan Vasilyevich, KGB major
Олег Белов
as Aleksey Burakov
Александр Михайлов
as Uncle Petya / German spy
Фёдор Одиноков
as Semyon, truck driver
Аристарх Ливанов
as Zhora "Brunette"
Андрей Крупенин
as Shurka "Krendel"
Александр Липов
as Valeriy Kaplunov, rocketeer
Константин Адашевский
as Voronov, clock master
Людмила Аржаникова
as House superintendent
