Samson

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)

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)