Skynet sends a new advanced model of the Terminator called the T-X back to July 24, 2004, to kill other members of the Human Resistance, an organization against Skynet. As a response, the Human Resistance also sends back a reprogrammed Terminator to protect them. John and Kate, his future wife are two of the targets. While the two and the Terminator prevent the T-X, they discover that Skynet is planning to pervade computer system of the US army and the situation becomes more complicated.