Tatiana Yurievna (Oksana Akinshina), a young female doctor, was almost stripped of her medical license for using controversial techniques. But she was recruited by the military to a secret research institute to help study a special case, astronaut Konstantin Sergeyevich (Pyotr Fyodorov). The astronaut survived a mysterious space accident and returned to Earth, but there was an alien creature in his body, and this mysterious creature only appeared late at night. The military wants to possess this alien creature for evil plans, but the female doctor just wants to stop the alien creature from killing the astronaut.