Solaris
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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Solaris (1972) is a drama, mystery, sci-fi movie running 2h 47m. Starring Natalya Bondarchuk, Donatas Banionis, Jüri Järvet. Rated 7.8/10 on TMDB. Watch it online free on ZapFlix.