In the previous film, the supercomputer "Skynet" failed to prevent the birth of the human resistance leader John Connor. 13 years later, before the arrival of "Judgment Day", "Skynet" sent a more advanced biochemical robot T-1000 (Robert Patrick) back to Los Angeles from 2029 AD to hunt down the grown-up John. At the same time, John also sent the robot T-800 (Arnold Schwarzenegger) back to protect his young self. At this time, Sarah Connor (Linda Hamilton) was admitted to a mental hospital because of her weird words and deeds, while John lived with his adoptive parents and behaved rebelliously. T-800 found them and gained their trust while escaping T-1000's pursuit. In order to change the future history and save the fate of mankind, Sarah, John and T-800 Model 101 found the father of Skynet, Miles Dyson (Joe Morton), and persuaded him to destroy all information about Skynet. At this time, the police and T-1000 arrived at the same time, and they fell into a multi-party fight.