This is set a number of years after the last Terminator movie - enough time for Sarah's son, John, to turn into a mouthy wisecracking pain in the ass teenager. Skynet sends back another Terminator, this time to kill John and the resistance send back someone to intercept it and protect him. So a similar premise to the first film, but this one is a lot more action-y and Arnie also gets a lot more lines. There's also a lot more timey-wimey temporal paradox stuff and backstory to how Skynet came in to being.
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