

Pirx, an experienced pilot, is hired to go on a top-secret mission to evaluate some 'nonlinears' (an experimental model of android) for use as crewmembers on future space flights. Pirx and this intriguing crew are sent out to launch two satellites into the rings of Saturn, but he is determined to find out and identify a hostile unhuman coworker among them.

Sergei Desnitsky
Pirx

Vladimir Ivashov
Brown

Aleksandr Kaydanovskiy
Nowak

Tõnu Saar
Weber
Zbigniew Lesień
Calder

Bolesław Abart
Otis

Ferdynand Matysik
Unesco Director

Igor Przegrodzki
McCuirre

Faime Jurno
Zygmunt Bielawski
Tech Companies Representative

Janusz Bylczyński
Judge
Adam Cieślak
Edmund Fetting
Prosecutor

Józef Fryźlewicz
Defense Attorney
Marek Idziński
Court Member

Mieczysław Janowski
Mitchell
Z. Jurkowski

Jerzy Kaliszewski
Android Creator

Eugeniusz Kujawski
Court Member

Ewa Lejczak
Marek Piestrak
Vladimir Valutskiy, Marek Piestrak
Released