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))