At the beginning of the 21st century, a plague took away 99% of human lives. The survivors relied on the invention of scientist Goodchard to build the isolated city of Brylag to maintain civilization. Four hundred years later, some citizens were dissatisfied with the dictatorship of the Goodchard regime and the continuous disappearances, and formed an armed force, the Monicans, to fight against it. Female warrior Ian (Charlize Theron) is the most powerful figure in the Monicans. In the task of destroying the Goodchard monitoring system, Ian witnessed the body of her sister who was killed by the other party. When Ian was furious, she received the order to assassinate Trevor, the head of Goodchard, but when she faced Trevor, the other party called the name "Catherine" and she fell into a chaotic memory and could not act. After Ian got out, he set out to investigate the truth of the city and found that the disappearances were closely related to the cloning plan, and the basis of Brylag's operation was to copy humans. Ian's discovery soon caused a chain reaction, involving all forces...