Julia Łuczkowska

Character: Ludka Balwikówna

Andrzej Pstrąg

Character: Marek Korcikowski

Zofia Truszkowska

Character: Ludka's Mother

Anna Seniuk

Character: Eliza

Maria Homerska

Character: Professor Mareszowa

Jan Machulski

Character: Ludka's Neighbour

Barbara Ludwiżanka

Character: Ludka's Aunt

Janusz Bukowski

Character: Stefan

Aleksander Sewruk

Character: Ludka's Father

Witold Skaruch

Character: Kasperski

Agnieszka Fitkau

Character: Stefan's Lover

Małgorzata Lorentowicz

Character: Parents' Committee Member

Tadeusz Pluciński

Character: Neighbour's Business Partner

Ewa Mirowska

Character: Store Clerk

Iwona Słoczyńska

Character: Teacher

Janina Borońska

Character: Ludka Balwikówna (voice)

Zbigniew Płoszaj

Character:

Jerzy Zygmunt Nowak

Character: Institute Assistant (uncredited)

Elżbieta Starostecka

Character: Jadzia (voice) (uncredited)