1. Kelvin takes Hari to the landing bay and urged her into a rocket for departure under the pretense that he will enter after her. However, after she had entered, he trapped her inside and started the lift-off program despite her screams. Disturbed by his action, Kelvin returns to his room for a shower. Snout enters and reveals to him that the presence of the unexpected visitors in the station is a result of an experiment where X-rays were applied to planet Solaris and they will re-appear despite efforts to eliminate them from the station. He tells Kelvin not to panic‘next time’.
2. Kelvin awakens from his dream and finds Hari back beside his bed. He takes her in bed and act as if everything is normal. After she is asleep, he leaves the room and tries to lock her inside. However, she immediately starts pounding from inside and pushes herself through the metal door with severe injuries. Kelvin quickly carries her onto the bed and tries to tend her wounds but finds the wounds heal within seconds. Hari sits up and tells Kelvin that she panicked when he was not around. Snout calls from the phone and says that Sartorius has summoned everyone to the laboratory.
3. Kelvin shows Hari around the station and meets Snaut and Sartorius. After Hari introduces herself, Sartorius explains that different from human which are made of atoms, the visitors are made of neutrinos. And the planet must send out a magnetic field to keep the visitors stable. Sartorius calls Hari an “excellent specimen” but Kelvin considers her his wife.
4. By observing Hari’s blood sample, Kelvin discovers that it keeps regenerating itself as if she is immortal. Sartorius suggests an autopsy on Hari, reasoning that visitors are inferior to lower animals on Earth. Kelvin feels offended by his suggestion, indicating that Hari feels pain as human being and warns Sartorius to stay away from her.
5. The liquid surface of Solaris is swirling violently. Kelvin shows Hari a home video showing him as a child and his parents in a snowy landscape around their house. The film jumps several years ahead, showing teenage Kelvin and his mother in the same setting during spring. It then shows Hari in winter, wearing the same dress and mantle as the Visitor Hari. After the film is finished, Hari looks in a mirror and says she does not know herself; as soon as she closes her eyes, she cannot remember her face. She suddenly remembers that Kelvin’s mother hated her. He tries to assure her that his mother had been gone before he met Hari, but she remembers how his mother told her to leave the house. Kelvin confesses that after that event, he was transferred for his work, and Hari refused to come with him.
6. Hari sleeps, but Kelvin cannot. Snaut comes in and tells him that the rate of regeneration has slowed down and visitors will disappear in 2 or 3 hours. He reasons that since Solaris projects the visitors from people’s minds during sleep, they should send their waking thoughts towards the planet by X-rays, which will hopefully stop the planet from sending visitors. Although Kelvin does not like idea with X-rays, Snaut proposes modulating the beam with the encephalogram of Kelvin. However, Kelvin fears that the planet may misinterpret his brain wave and eliminate Hari. Snaut mentions that Sartorius is working on the 'Annihilator', which can destroy neutrino systems. Kelvin feels this is blackmailing to get him to cooperate with the encephalogram. To reduce the tension, Snaut mentions tomorrow is his birthday, and that all are invited. Kelvin notices that it is worrying that Hari already knows how to sleep. He and Snout go to Sartorius, leaving Hari to sleep. As Kelvin leaves, Hari seems to sob under her blanket. At the lab, Kelvin suddenly says he forgot something, and returns to his room. He hugs Hari passionately and asks her to forgive him. They kiss as clouds roll over the liquid surface of Solaris.
7. Kelvin wakes up and finds Hari confused about her origin and claims Kelvin does not love her. She explains that hat Sartorius told her the night before that the real Hari poisoned herself, meaning she must be someone else. And fearing for Kelvins' well-being, she does not want to continue her existence anymore. She asks him to tell her about the real Hari. Kelvin explains that at the end of their relationship, they quarreled a lot, and he left, even though he often thought of her. He implies that Hari threatened with suicide, but he left anyway, until he remembered that he had left an experimental liquid in the fridge. He went back, but Hari had already injected herself with this poisonous liquid. Visitor Hari is distressed when she sees a needle mark on her arm as well. She asks Kelvin why real Hari committed suicide; Kelvin believes that she mistakenly thought he did not love her anymore. Kelvin urges her to sleep, but she says that even her sleep feels unreal.
8. Snout arrives in the library and hands Chris a book from a pile for him to read out loud, while giving Hari a kiss on her hand. It is an excerpt from Don Quixote, where Sancho praises the blessings of sleep. Sartorius proposes a toast to Snaut's courage and devotion to science. Snaut objects that science is a fraud and claims their present scientific problem will not be solved. He says mankind has no ambition to conquer the cosmos; Humankind simply wants to extend Earth's borders and attempts to contact with extraterrestrials is doomed to fail, as the goal is one mankind fears. Instead, he proposes a toast to Gibarian, who was fearful. Kelvin cannot agree, arguing that he thinks Gibarian committed suicide because he thought he was alone in what happened to him. Sartorius counters this, claiming that it is Man’s mission to gain knowledge and search for truth; He criticizes Kelvin for only showing compassion and sentiment toward ex-wife all day, and Gibarian for being contemptible. Hari is disturbed by the arguments; she claims that Kelvin is the only one showing humanity, whereas the other two do not at all care and regard visitors as specimens and external enemies. Sartorius seems vexed, questioning her existence, claiming her as a mere reproduction of the real Hari who has been dead. Hari acknowledges, but says she is becoming human; she can feel and love and exist independent from Kelvin. Hurt by Sartorius' cruel words, she walks away and knocks over a chandelier. She tries to take a drink, but cannot swallow it, breaking down in tears. Kelvin tries to comfort her, much to Sartorius' disgust, who leaves. Snaut says that all the quarreling makes them loose their humanity and dignity. In tears, Hari says that each of them is human in his own way, and that is why they quarrel. Kelvin appreciates Snaut’s continuing kindness. Snaut gets drunk singing and talking gibberish about communicating with the planet as they walk. Kelvin wants to return as he left Hari alone in the library. Snaut warns him that the station is shifting orbit, so there will be 30 seconds of weightlessness at 1700 hours.
9. Kelvin returns to the library, finding Hari lost in thoughts. She looks intensely at a painting in the library, depicting a lively winter landscape back on Earth. She has a brief memory of Chris as a boy, standing in the snow as well. Kelvin awakens her from her trance. Objects as well as he and Hari start to float due to weightlessness. They share a short moment of happiness amidst the art in the room as the gravity comes back.
10. The planet surface starts to make boiling movements. Kelvin finds Hari lying dead on the floor in the main corridor after drinking liquid oxygen. When Snaut enters the corridor, Kelvin tells him she killed herself out of desperation. Snaut says that it will get worse as she gets more human. Kelvin confesses that he has no choice, as he loves her. But Snaut warns him that what he loves is just a scientific anomaly that can endlessly regenerate. As Snout leaves, he says he could never get used to the continuous resurrections, as it is apparently agonizing for Hari. Chris tries to calm her down, assuring that she means more to him than all science ever could; But Hari goes into hysterics, repeating that she should not exist.
11. Clouds evaporate from the swirling ocean. Kelvin puts Hari on the bed and assures her he will stay with her on the station. They embrace and fall asleep. Kelvin awakens, soaked in sweat. He wanders through the central corridor, finding Snaut looking outside. He says that the ocean seems to be more active due to Kelvin’s encephalogram. Kelvin makes philosophical remarks about life, souls and suffering, and love as something inexplicable and the reason of human existence. Appearing feverish, He is put to bed and has dreams of his parental home, Hari, his mother. He has a conversation with his mother in her home, as if he has just returned to Earth. Kelvin tells her he almost forgot her face, and says he is lonely and unhappy; She asks him why he is seemingly neglecting himself. She notices stains on his arm and washes them off. The reunion causes Kelvin to cry. He then awakens. Snaut gives him a letter, saying Hari is gone. She is sorry for deceiving Chris, but she saw no other solution. It was her decision, and none of the others are to blame. Kelvin tearfully reminds himself of all his quarrels with her the past few days and asks why they are so tormented. Snaut replies that it is because Mankind, unlike his primitive ancestors, has lost his believe in greater cosmic powers. Since Chris' encephalogram was sent down to the planet, the visitors have stopped appearing, and islands are appearing on the ocean's surface. Kelvin believes that the planet may finally understand them now.
12. Kelvin and Snaut continue their philosophical talk in the library. Kelvin asks if Snaut feels a clear link with the life below after so many years on the station. Snaut remarks that the meaning of life and other eternal questions only interest unhappy people, and such questions should be asked at the end of one's life; Kelvin still sees Hari's cloak hanging on a chair, and concludes that mankind is always in a hurry since they never know when their life will end. The happiest people are the ones who never ask such questions; we question life to seek meaning, yet to preserve all the simple human truths like happiness, death and love, we need mysteries. Not knowing the date of your death practically makes one immortal.
13. As clouds roll by, Kelvin is immersed in thought, narrating that his mission is over. There is now the option to go back to Earth and return to his normal life. The other possibility is to stay, even for the mere possibility of contact with the ocean, which his race is desperately trying to attain. And perhaps hoping for Hari to return. But he has no more hope and can only wait for a new miracle.
14. Kelvin returns to the house where his dog is running to him. His father is sorting books. He notices Kelvin and goes outside. As Kelvin gets on his knees and hugs his father, the camera pulls back through the swirling clouds, revealing that the house, the lake and the surrounding land are lying on a small island amidst the vast ocean on Solaris.
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