年轻女医生Tatiana Yurievna（奥莎娜·阿金什那 Oksana Akinshina 饰）因为使用具争议的技术而差点被吊销医师执照。但她被军方招募来到一个机密的研究机构，协助研究一个特别的案例，太空人Konstantin Sergeyevich（彼得·费奥多罗 夫 Pyotr Fyodorov 饰）。这位太空人历经神秘的太空意外后幸存返回地球，体内却多了外星生物，而且这个神秘生物只在深夜时现身。军方想拥有这个外星生物进行邪恶的计划，但女医生只想阻止外星生物杀害太空人。At the height of the Cold War, a Soviet spacecraft crash lands after a mission gone awry, leaving the commander as its only survivor. After a renowned Russian psychologist is brought in to evaluate the commander's mental state, it becomes clear that something dangerous may have come back to Earth with him.