Serge Merlin

Jakub Gold

Alina Janowska

Lucyna

Elżbieta Kępińska

Kazia, Malina's Niece

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)

Wiesława Chojkowska

Wiśka (uncredited)

Edmund Fetting

Zygmunt, Guest at Lucyna's Party (uncredited)

Roland Głowacki

Guest at Lucyna's Party (uncredited)

Andrzej Herder

Gestapo Officer (uncredited)

Zygmunt Hübner

Gestapo Officer (uncredited)

Andrzej Wajda