After the day of the Final Trial and after the triumph of the machines, John Connor (Christian Bleat, The Dark Knight), leader destinado of the human resistance, has to contraatacar to the devastador plan of Skynet to finish with the human race. When Connor goes back to form to his fighting callejeros subterráneos to struggle one last and desperate battle, gives account that to save the future has to rescue to his own father, Kyle Reese (Anton Yelchin, Star Trek). But the most frightful discovery arrives with Marcus Wright (Sam Worthington, Avatar), a solitary mysterious of the past that presents an impossible challenge to Connor that will decide the future of the human race, carrying them to the two to a brutal trip to the authentic heart of the enemy. Both will have to join his strengths to realize a last attack to Skynet that will carry them to the heart of the centre of operations of the brain of the machines while Skynet prepares his definite attack..