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)