Hanka Ordonówna as Rita Holm, Singer and intelligence agent

Bogusław Samborski as Pedro

Jerzy Leszczyński as Professor Skalski, Jerzy's father

Jerzy Pichelski as Engineer Jerzy Skalski

Igo Sym as Head of Intelligence

Lena Żelichowska as Polish counterintelligence agent

Wanda Jarszewska as Shop Customer

Alina Żeliska as Customer

Andrzej Bogucki as Man in Cafe

Lech Owron as Man talking to Skalski

Roman Dereń as Caretaker in Laboratory

Aleksander Suchcicki as Skalski's Colleague

Zdzisław Karczewski as Albert

Loda Niemirzanka as