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Jan Tříska
Jan Svozil
Jana Hliňáková
Jaroslav Rava
Stanislav Hradecký
Jana Hlaváčková
Vlasta Martínková
Gabriela Wilhelmová
Hana
Zdena Herfortová
Eva Svozilová
Oldřich Vykypěl
ROH chairman
Oldřich Slavík
Jaroslav Stehlík (uncredited)
Jiří Hanák
Miroslav Janoušek (uncredited)
Vilém Pfeiffer
Bartoněk (uncredited)
Jiří Dušek
Zdražil (uncredited)
Milan Pásek
Institute director (uncredited)
Karel Adam
Department manager (uncredited)
Helena Trýbová
Scientist (uncredited)
Vladimír Pavlar
Doc. Rozehnal (uncredited)
Bohumil Slezáček
Professor (uncredited)
Arnošt Navrátil
Doctor (uncredited)
Sylvie Nitrová
Nurse (uncredited)
Marcela Dürrová
Laboratory assistant (uncredited)
Miroslav Donutil
Assistant (uncredited)
Milan Kročil
Assistant (uncredited)
Zdeněk Maryška
Assistant (uncredited)
Zdeněk Dryšl
Houseman (uncredited)
Jana Gazdíková
Secretary (uncredited)
Blažena Rýznarová
Official (uncredited)
Markéta Rauschgoldová
Canteen assistant (uncredited)