In 1999, in Tokyo, a military robot automatically activated without a human being, and a talented programmer of Sasahara heavy Industries named Yingichi Sailing committed suicide; no one thought that two unrelated incidents would bring Tokyo into terror in the future. A kind of large robot called "Labor" can be seen everywhere from the construction site to people's daily life. In the face of the increasing number of Labor-related crimes, the police department has set up a special vehicle class 2, equipped with a special robot PatLabor, responsible for handling special affairs. Labor is in a period of upgrading, when the computer operating system, as the robot brain, is upgraded to HOS. At this time, a number of incidents of robot out of control suddenly occurred, and the mobile police team was responsible for investigating the matter. They found that it was caused by a computer virus related to HOS, and the culprit had destroyed all the data and was missing. The Babylonian project to build a giant ark at sea to solve Tokyo's land problems has reached a critical juncture in Tokyo Bay, where 45% of the country's Labor robots will be unimaginable if they get out of control. This film is the theatrical version of the TV animation Mobile Police.