Jan Svozil
Stanislav Hradecký
Vlasta Martínková
Hana
Eva Svozilová
ROH chairman
Jaroslav Stehlík (uncredited)
Miroslav Janoušek (uncredited)
Bartoněk (uncredited)
Zdražil (uncredited)
Institute director (uncredited)
Department manager (uncredited)
Scientist (uncredited)
Doc. Rozehnal (uncredited)
Professor (uncredited)
Doctor (uncredited)
Nurse (uncredited)
Laboratory assistant (uncredited)
Assistant (uncredited)
Assistant (uncredited)
Assistant (uncredited)
Houseman (uncredited)
Secretary (uncredited)
Official (uncredited)
Canteen assistant (uncredited)