Following the events of "Terminator 2: Judgement Day", Sarah and John Conner fled to Paraguay to disappear. But one day Sarah spots an 'Arnold' Terminator unit in the town square. A cat-and-mouse game ensues before she realises he is not a Terminator but the actual man - an ex-counter-terrorist named Dieter, whom the Terminators were modelled on. After Sarah shares her story with him, Dieter tells her that Cyberdyne (the company which will build the computers that will destroy civilization and create the Terminators) is up and running again, thanks to its backup systems. So she, John and Dieter set off to finish the job. But standing in their way is the most dangerous Terminator unit yet. It can easily pass as human, it has all the resources of Cyberdyne, as well as several 'Arnold' Terminators at its command, and it's in the guise of a woman.