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Jan Tříska
Jan Svozil
Jana Hlaváčková
Vlasta Martínková
Gabriela Wilhelmová
Hana
Zdena Herfortová
Eva Svozilová
Oldřich Vykypěl
ROH chairman
Vilém Pfeiffer
Bartoněk (uncredited)
Milan Pásek
Institute director (uncredited)
Miroslav Donutil
Assistant (uncredited)
Zdeněk Maryška
Assistant (uncredited)
Jana Gazdíková
Secretary (uncredited)