Cast
Aleksandr Safronov as Volodya Prokhorov
Igor Vasilev as Academician Korostylyov
Yuriy Nazarov as Rodion Terentyevich Ugryumov
Lyudmila Maksakova as Yuliya Aleksandrovna Skurlatova
Vladimir Nosik as Dyomkin
Olga Gudkova as Lena
Nadezhda Butyrtseva as Tanya
Vladimir Gulyaev as Shibanov
Gennadi Korolkov as Kharlamov
Gennadi Krasheninnikov as Petrikov
Aleksandr Pyatkov as Tyurin
Georgios Sovchis as Gulyayev
Valery Shalnyh as Valeriy Orlov
Vladimir Privalov
Nikolay Shatskiy as Grandpa Antip
Vadim Aleksandrov as Sherstyuk
Natalya Khorokhorina
Aleksey Zolotnitskiy as Scientist
Veleriy Zakharyev as Research Assistant
Andrei Voznesenskiy
Yuri Gusev as Scientist(uncredited)