Klec

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)