Klec

Jan Tříska

Jan Svozil

Jaroslav Rava

Stanislav Hradecký

Jana Hlaváčková

Vlasta Martínková

Gabriela Wilhelmová

Hana

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 Durrova

Laboratory assistant (uncredited)

Miroslav Donutil

Assistant (uncredited)

Milan Kročil

Assistant (uncredited)

Zdenek Maryska

Assistant (uncredited)

Zdeněk Dryšl

Houseman (uncredited)

Jana Gazdikova

Secretary (uncredited)

Blažena Rýznarová

Official (uncredited)

Canteen assistant (uncredited)

Luděk Škuta

Set designer

Jiří Kačírek

Vojtěch Štursa

Director

Alena Hachlová

Editor

Rudolf Večeřa

Zdeněk Čecháček