The story takes place 10 years after Terminator 2, and the Terminator is back. John Connor(Nick Stahl) is 22 years old at this time. After his mother passed away, he lived an incognito life and was unwilling to face his upcoming fate. However, fate did not depend on his will. After two failures, Skynet sent a more advanced T-X Terminator (Kristanna Loken) to hunt him down. Humans also sent back the T-800's modified Terminator, T-850 (Arnold Schwarzenegger), to protect John. John happens to meet his childhood friend, veterinarian Kate Brewster (Claire Danes). Kate's father is the head of the U.S. military's Skynet system. She will also become the deputy commander of the human rebels and naturally become the target of T-X. Under the protection of the T-850, the two began their escape journey. At the same time, a virus invaded the American computer system, and humans were helpless and ready to activate "Skynet". Once "Skynet" took over the US military...