At the end of "Terminator 2: Judgment Day," Sarah Connor vanquished the Terminator sent from the future to kill her 15-year-old son, John. Sarah and John now find themselves alone in a very dangerous, complicated world. Fugitives from the law, they are confronted with the reality that still more enemies from the future and the present could attack at any moment. Sarah stops running and goes on the offensive against an ever-evolving technological enemy bent on destroying her life -- and perhaps the world.