Khari
Kris Kelvin, psikholog
Doktor Snaut, kibernetik (as Yuri Yarvet)
Anri Berton, pilot
Nik Kelvin, otets Krisa Kelvina
Doktor Sartorius, astrobiolog
Mat Krisa Kelvina (as O. Barnet)
Syn Anri Bertona (as V. Kerdimun)
Gostya doktora Gribaryana (as O. Kizilova)
Plemyannitsa Krisa Kelvina (as T. Malykh)
Shanakhan, predsedatel komissii Anri Bertona (as A. Misharin)
Professor Tarkhe (as B. Oganesyan)
Anna, tetka Krisa Kelvina (as T. Ogorodnikova)
Doktor Gribaryan, fiziolog (as S. Sarkisyan)
Predsedatel nauchnoy konferentsii (as Yu. Semyonov)
Chlen uchenogo soveta (as V. Statsinskiy)
(as V. Sumenova)
Professor Messendzher (as G. Teykh)
Kris Kelvin v otrochestve (uncredited)
Gost doktora Sartoriusa (uncredited)
Frantsuzskiy uchenyy na konferentsii (uncredited)
Doktor Snaut, kibernetik (voice) (uncredited)
Kris Kelvin, psikholog (voice) (uncredited)