Computer are becoming too powerful
John Connor (Edward Furlong) is now living with foster parents. He has grown up being told by his mother that he would someday lead the human race to beat the machines. Sarah has changed a lot because since the first movie - being stronger in mind and body - making people think she is crazy, and so she is sent to a mental hospital - Pescadero State Hospital.
Meanwhile, the Terminator and the unknown man both find John Connor in a shopping mall. Then, there is a twist: the unknown man is not the one who is ment to stop John getting killed, as the people watching thought so based on the first movie. The killing machine from the first movie is now the one ment to stop John getting killed, and the other man is another Terminator trying to kill John. When the good Terminator rescues John, he tells him what is happening. He is a Model 101, made by the future John Connor to act as the one to keep him from harm. The other Terminator is a T-1000, sent to kill him. It is made of mimetic polyalloy, or liquid metal, making it able to morph anyone or anything of equal size, except "complex machines" like "guns and explosives" because they "have chemicals, moving parts." It can however form "knives and stabbing weapons."