During World War II, the famous Battle of Stalingrad broke out between the Soviet Union and Germany, and 2 million people died in this battle. It is reported that the Soviets used some kind of biological and chemical weapons to carry out biological and chemical genocide in the war, and the diary of the German soldier Hans vaguely recorded all this madness. In modern times, the CIA received news that its base in Bulgaria had abnormal conditions, and reliable information showed that the biological and chemical weapons that the Soviets tried their best to obliterate and hide were hidden there. Captain John McGahey (Paul Logan) was ordered to enter Bulgaria as an investigator of the chemical plant, and contacted Anna Bennett (Manal El-Feitury), a military doctor who had witnessed the terrible scene, to understand the matter. However, the disaster inevitably broke out, and all those infected with biochemical gases became bloodthirsty and cruel zombies. The peaceful city suddenly turned into a killing hell...