 Mariusz BenoitWiktor Siennicki | Wiktor Siennicki |
 Grażyna SzapołowskaEwa Wojtowicz | Ewa Wojtowicz |
 Jerzy KryszakMarek Paduk | Marek Paduk |
 Igor PrzegrodzkiHospital Director | Hospital Director |
 Henryk BoukołowskiMadej | Madej |
 Józef FryźlewiczWarecki | Warecki |
| EEwa DecównaMaria | Maria |
 Mieczysław MileckiŁaciak | Łaciak |
 Marek SiudymDoctor | Doctor |
 Marcin TrońskiPatient | Patient |
| ZZdzisława SpechtNot listed | Not listed |
 Stanisław MichalskiKowalczyk | Kowalczyk |
 Grażyna KorinNot listed | Not listed |
| TTeresa SawickaWarecki's Wife | Warecki's Wife |
 Eugeniusz KujawskiInstitute Worker | Institute Worker |
 Alfred FreudenheimWarecki's Friend | Warecki's Friend |
 Ewa ZiętekMarta Paduk | Marta Paduk |
 Bolesław AbartBartender (uncredited) | Bartender (uncredited) |
 Michał AniołNuclear Facility Employee (uncredited) | Nuclear Facility Employee (uncredited) |
 Monika GoździkPatient (uncredited) | Patient (uncredited) |
 Lech GrzmocińskiCaretaker (uncredited) | Caretaker (uncredited) |
 Andrzej HrydzewiczMan Measuring Wiktor's Room #1 (uncredited) | Man Measuring Wiktor's Room #1 (uncredited) |
 Mieczysław JanowskiMan Measuring Wiktor's Room #2 (uncredited) | Man Measuring Wiktor's Room #2 (uncredited) |
 Antoni JuraszWiktor's Father (uncredited) | Wiktor's Father (uncredited) |
 Ryszard KotysSkowron (uncredited) | Skowron (uncredited) |
 Eliasz KuziemskiKarwasz | Karwasz |
 Bohdana MajdaSick Woman's Mother (uncredited) | Sick Woman's Mother (uncredited) |
 Andrzej MrozekAdvisor (uncredited) | Advisor (uncredited) |
 Jadwiga SkupnikWiktor's Wedding Guest (uncredited) | Wiktor's Wedding Guest (uncredited) |
 Andrzej SzopaInstitute Worker (uncredited) | Institute Worker (uncredited) |