Serge Merlin
Jakub Gold

Alina Janowska
Lucyna

Elżbieta Kępińska
Kazia

Kazia

Jan Ciecierski
Józef Malina

Tadeusz Bartosik
"Professor" Pankrat

Władysław Kowalski
Fiałka / Jakub Gold (voice)

Irena Netto
Jakub's Mother

Beata Tyszkiewicz
Stasia

Jan Ibel
Genio

Bogumił Antczak
Prisoner (uncredited)

Edmund Fetting
Zygmunt

Zygmunt

Roland Głowacki
Guest at Lucyna's Party (uncredited)

Andrzej Herder
Gestapo Officer (uncredited)

Zofia Jamry
Woman Blackmailing Malina (uncredited)

Stanisław Jaśkiewicz
Professor at a Lecture (uncredited)

Zbigniew Józefowicz
Guest at Lucyna's Party (uncredited)

Edward Kowalczyk
Policeman (uncredited)

Zygmunt Listkiewicz
(uncredited)

Jerzy Łapiński
Caroller (uncredited)

Zdzisław Maklakiewicz
ONR Member (uncredited)