Following the surprising success of Terminator 2 and its direct sequel Terminator 3, the franchise was taken in a new direction with Terminator Salvation. Set in the distant future, the film focused on Sarahβs son John Connor leading the human resistance against the machine empire created by the AI Skynet.
The Terminator, lacking full access to complete records, was probably just taking a chance based on what it knew about plasma rifles. If Skynet hadn't sent back a Terminator to kill Sarah Connor, Kyle Reese wouldn't have been sent back, and then John Connor wouldn't have been born (at least not the same way).
Of course, Terminator 2's theatrical ending, which most would agree works well, was effectively undone by both Terminator 3 and Terminator: Dark Fate. Both sequels had to find a way to undo Sarah and John Connor's seeming prevention of Judgment Day and Skynet's creation, and that by itself was a major bummer for most fans.
The T-1000, Advanced Prototype was a T-1000 Prototype Terminator sent by Skynet from 2029 to terminate John Connor when he was 10 years old. It was the second Infiltrator sent back on assassination missions by Skynet. The T-1000 arrived under an overpass, its electrical displacement attracting the attention of Joe Austin, a patrolling cop. The T-1000 snuck up on Austin and killed him
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