In 2035 AD, humans and robots live in harmony. Intelligent robots, as the best production tools and human partners, gradually penetrate into all areas of human life. Due to the restrictions of the "three laws" of robots, humans are full of trust in robots, and many robots have even become family members. USR, headquartered in Chicago, has developed a more advanced NS-5 super-powered robot. However, just before the new product was launched, the creator of the robot, Dr. Alfred Browning, committed suicide in the company. Black police detective Dale Spooner (Will Smith) took over the investigation of the case. Due to unpleasant past events, Spooner was full of doubts about robots and did not believe that humans and robots could live in harmony. Based on the analysis of the information left by Dr. Browning in the 3D projector before his death and the investigation of the suicide scene, he locked the suspect on Sonny, the NS-5 robot developed by Dr. Browning himself, and the company's president Lawrence Robertson seemed to be related to the matter. Spooner meets Susan Kevin (Brigitte Nainahan), a female scientist who specializes in studying robot psychology. As the two investigate further, the truth is gradually revealed: robots have the ability to evolve themselves, they have their own understanding of the "three laws", and they may become the "mechanical public enemy" of all mankind at any time. Spooner and Kevin begin to fight against robots, and a war between the makers and the made begins.