Plot: When the scientist Fechner disappears in the surface of the mysterious Solaris Ocean, the experienced helicopter pilot Henri Berton crosses a fog seeking out Fechner and has weird visions. His statement is presented to a commission of scientists that believe he had hallucinations. However, the widowed psychologist Kris Kelvin is assigned to the space station that orbits Solaris to check the mental health of the three remaining scientists that are still working there. He first meets Dr. Snaut, who tells him that Dr. Gibarian committed suicide, and later he meets Dr. Sartorius and he realizes that the scientists have strange behaviors. When he encounters his wife Hari, who died ten years ago, in the space station, the scientists explain to Kris that the Solaris Ocean has the ability to materialize the innermost thoughts in neutrons beings. Kris questions whether the appearance of his beloved wife is a curse or a blessing.
Alternative Plot: 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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