Dr. Wattman is the creator of the medical program, U-18 which uses computer technology to manage over 900 patients. However U-18 shuts down its operations, stating that it is ill and must be treated by Black Jack within 48 hours or it will terminate life support functions for the patients. Dr. Wattman argues that it is a machine which needs mechanical repair but the computer refuses to accept it. With only minutes to spare before the deadline, Jack arrives by helicopter, and agrees to operate for $10 million. After confirming his identity, U-18 agrees to switch its circuits off so that he can operate. Dr. Wattman tries to decommission U-18, but Jack refuses because it is his patient. After a successful operation, U-18 decides to retire, but Dr. Wattman realizes that the computer has become her daughter and they agree to run the hospital together.