cast
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Jan Tříska
Jan Svozil
- Jana Hliňáková
- Jaroslav Rava Stanislav Hradecký
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Jana Hlaváčková
Vlasta Martínková
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Gabriela Wilhelmová
Hana
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Zdena Herfortová
Eva Svozilová
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Oldřich Vykypěl
ROH chairman
- Oldřich Slavík Jaroslav Stehlík (uncredited)
- Jiří Hanák Miroslav Janoušek (uncredited)
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Vilém Pfeiffer
Bartoněk (uncredited)
- Jiří Dušek Zdražil (uncredited)
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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)
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Miroslav Donutil
Assistant (uncredited)
- Milan Kročil Assistant (uncredited)
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Zdeněk Maryška
Assistant (uncredited)
- Zdeněk Dryšl Houseman (uncredited)
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Jana Gazdíková
Secretary (uncredited)
- Blažena Rýznarová Official (uncredited)
- Markéta Rauschgoldová Canteen assistant (uncredited)