The Solaris mission has established a base on a planet that appears to host some kind of intelligence, but the details are hazy and very secret. After the mysterious demise of one of the three scientists on the base, the main character is sent out to replace him. He finds the station run-down and the two remaining scientists cold and secretive. When he also encounters his wife who has been dead for ten years, he begins to appreciate the baffling nature of the alien intelligence.
Donatas Banionis....Kris Kelvin, psikholog
Jüri Järvet....Doktor Snaut, kibernetik (as Yuri Yarvet)
Vladislav Dvorzhetskiy....Anri Berton, pilot
Nikolay Grinko....Nik Kelvin, otets Krisa Kelvina
Anatoliy Solonitsyn....Doktor Sartorius, astrobiolog
Olga Barnet....Mat Krisa Kelvina (as O. Barnet)
Vitalik Kerdimun....Syn Anri Bertona (as V. Kerdimun)
Olga Kizilova....Gostya doktora Gribaryana (as O. Kizilova)
Tatyana Malykh....Plemyannitsa Krisa Kelvina (as T. Malykh)
Aleksandr Misharin....Shanakhan, predsedatel komissii Anri Bertona (as A. Misharin)
Bagrat Oganesyan....Professor Tarkhe (as B. Oganesyan)
Tamara Ogorodnikova....Anna, tetka Krisa Kelvina (as T. Ogorodnikova)
Sos Sargsyan....Doktor Gribaryan, fiziolog (as S. Sarkisyan)
Yulian Semyonov....Predsedatel nauchnoy konferentsii (as Yu. Semyonov)
Filmography links and data courtesy of The Internet Movie Database.