A cyborg assassin called "The Terminator" is sent back through time to 1984 to kill the seemingly innocent Sarah Connor - a woman whose unborn son will lead the human race to victory in a bitter future war with a race of machines. If the Terminator succeeds, mankind is doomed. Sarah's only hope is a soldier from that post-apocalyptic war, who has chased the Terminator back through time. The future of the human race depends on which one finds her first...