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| Natalya Bondarchuk | Khari |
| Donatas Banionis | Kris Kelvin |
| Juri Jarvet | Dr. Snaut |
| Vladislav Dvorzhetsky | Berton |
| Nikolai Grinko | Kelvin's father |
| Anatoli Solonitsyn | Dr. Sartorius |
| Sos Sarkisyan | Dr. Gibaryan |
| Olga Barnet | Mother |
| Aleksandr Misharin |
A psychologist is sent to a space station orbiting a planet called Solaris to investigate the death of a doctor and the mental problems of cosmonauts on the station. He soon discovers that the water on the planet is a type of brain which brings out repressed memories and obsessions.
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