Marcus then emerges from the wreckage of the base attack and John heads for the Resistance HQ to report about his finding anf the Resistance discovered a radio frequency able to shut down. John learns that his own name is second on the list, following Kyle Reese who happens to be John's father. The Resistance then try to stop the attack that lead by General Ashdown.
Marcus does not know he is a cyborg with human organs, a mechanical endoskeleton, circuitry, and a partially artificial cerebral cortex. Meanwhile, Marcus makes a deal with John that he can enters the Skynet base and interfaces with the computer, disabling the perimeter defenses and allowing John to infiltrate the cell block and release the human prisoners. Without his knowledge that Marcus was created by Skynet and has unwittingly fulfilled his programmed mission to lure John into the base to be killed. He then tears out the hardware linking him to Skynet to help John in battling a T-800 Model 101 Terminator. John was wounded severely so Marcus offers his heart for transplant, sacrificing himself to save John. Recovering, John radios to the other Resistance fighters that though this battle has been won, the war is far from over.
The movie was excellent as you can see a lot of new terminators and the funny part was in the end of the movie that you can see a younger Arnold Schwarzenegger who first brought the Terminators franchise. A worthy movie.