Sputnik

As the Orbita-4 spacecraft approaches Soviet Kazakhstan, cosmonauts Konstantin Veshnyakov and Kirill Averchenko prepare for re-entry. However, their descent takes a horrifying turn when an uninvited presence begins to infiltrate their shuttle.

In a shocking turn of events, Konstantin discovers Kirill Averchenko's lifeless body with a shattered skull. The initially anxious atmosphere in the spacecraft morphs into chaos and horror as Konstantin himself lies still, his eyes appearing as dark voids.

In Moscow, Dr. Tatyana Yuryevna faces scrutiny for her unconventional medical practices. Despite her success in saving a 17-year-old boy, her techniques raise skepticism from colleagues, culminating in a tribunal that challenges her professional integrity.

Colonel Semiradov invites Tatyana to Kazakhstan, intrigued by her expertise as it pertains to Konstantin's alarming condition. He believes that her unique insights could be critical in decoding the bizarre events surrounding the cosmonaut.

Upon her arrival in Kazakhstan, Tatyana meets Yan Rigel, the research director who is struggling to comprehend Konstantin's erratic behavior. Their discussion reveals the complex emotional turmoil surrounding Konstantin, rooted deep in his personal history.

Driven by insomnia and curiosity, Tatyana jogs around the facility during the night. She encounters an inmate who offers help but behaves strangely, refusing to let go of her hand until interrupted, highlighting the facility's undercurrents of tension.

During a visit, Tatyana witnesses a shocking event when a protective door suddenly crashes open, revealing an alien parasite emerging from Konstantin’s mouth. Semiradov explains the creature's bizarre nature as Tatyana stands in stunned horror.

Tatyana learns about Konstantin's heart-wrenching past, which includes abandoning his son at an orphanage following his wife's death. This conversation adds layers to her understanding of his psyche and reveals the emotional scars he carries.

To better understand Konstantin's condition, Tatyana persuades Semiradov to move him to a medical unit where he can interact with civilians. This decision proves crucial as Konstantin begins to confide in her, revealing the weight of his traumatic experiences.

Tatyana grows increasingly concerned about the alien parasite’s influence over Konstantin. While attempting to communicate with it using a nesting doll, she becomes ensnared in its mucus, leading to a dangerous situation that solidifies her awareness of the threat.

After recovering from her ordeal, Tatyana presses Semiradov to transfer Konstantin to Moscow for more thorough research. It becomes apparent that Semiradov has ulterior motives, having concealed Konstantin's condition from higher authorities, raising suspicions about his intentions.

Tatyana and Yan begin covertly monitoring Semiradov's activities, realizing that his team is exploiting the alien parasite for their own destructive ends. Tatyana remains determined to halt their dangerous experiments as the stakes amplify.

In a tense exchange, Konstantin reveals chilling details about his interactions with the alien parasite. As he describes the toll it has taken on him, Tatyana faces the reality of Semiradov's unscrupulous pursuits that haunt them all.

The tension culminates in a decisive confrontation between Tatyana, Konstantin, and Semiradov. Konstantin channels his link to the parasite to fight back against the oppressive regime, showcasing his determination to protect Tatyana and reclaim their freedom.

In the aftermath of their tumultuous escape, Tatyana finds herself changed by their shared trauma. Choosing to adopt Konstantin's son from the orphanage, she embraces a new beginning filled with hope, contrasting deeply with the darkness of their experiences.