Characters played by Sergei Desnitsky
Commander Pirx
Characters played by Boleslaw Abart
Jan Otis
Characters played by Vladimir Ivashov
Harry Brown
Characters played by Aleksandr Kaydanovskiy
Tom Nowak
Characters played by Zbigniew Lesien
John Calder
Characters played by Ferdynand Matysik
Green (UNESCO Director)
Characters played by Igor Przegrodzki
McGuirr
Characters played by Tõnu Saar
Kurt Weber
Characters played by Zygmunt Bielawski
(as Z. Bielawski)
Characters played by Janusz Bylczynski
Juge
Characters played by Adam Cieslak
(as A. Cieslak)
Characters played by Edmund Fetting
Oskarzyciel przed trybunalem
Characters played by Józef Fryzlewicz
Obronca Pirxa przed trybunalem
Characters played by Marek Idzinski
Czlonek trybunalu
Characters played by Mieczyslaw Janowski
Mitchell
Characters played by Faime Jurno
(as F. Jurno)
Characters played by Z. Jurkowski
[no data]
Characters played by Jerzy Kaliszewski
Dr. Kristoff
Characters played by Eugeniusz Kujawski
Czlonek trybunalu
Characters played by Ewa Lejczak
(as E. Lejczak)
Characters played by Erwin Nowiaszek
Prezes 'United Atomic Laboratory'
Characters played by Aleksandr Belyavskiy
(uncredited)