Jan Tříska
as Jan Svozil
Jana Hliňáková
as
Jaroslav Rava
as Stanislav Hradecký
Jana Hlaváčková
as Vlasta Martínková
Gabriela Wilhelmová
as Hana
Zdena Herfortová
as Eva Svozilová
Oldřich Vykypěl
as ROH chairman
Oldřich Slavík
as Jaroslav Stehlík (uncredited)
Jiří Hanák
as Miroslav Janoušek (uncredited)
Vilém Pfeiffer
as Bartoněk (uncredited)
Jiří Dušek
as Zdražil (uncredited)
Milan Pásek
as Institute director (uncredited)