To understand this movie, we must first grasp the node of the timeline. The original timeline has three time nodes: Terminator 1, Terminator 2, and Terminator 3. At the beginning, the timeline was still the original timeline, and Karl (John Connor’s father) was sent back to the first time. Node, to save his mother and give birth to John Connor. During the teleportation, Carl discovered that John Connor was attacked by a robot. From behind, he learned that John Connor was killed in the attack and was turned into a Skynet robot. So at this time in the future, Skynet has already won, and there is no need to go back to kill John Connor. But Carl has already witnessed this scene. In order to prevent Carl from telling Sarah Connor and reminding John Connor to avoid the assassination, Skynet decided to send T1000 back to Sarah when she was a child, to kill Sarah, to completely eliminate hidden dangers, and to ensure Skynet's future. victory.
But Skynet was born due to the development of the T800 robot wreckage in Terminator 1. Skynet would not be born if Sarah was removed. Therefore Skynet sent robotized Connor back to the 21st century to re-establish Skynet. Let's tentatively name it Xintian.com. If the new Skynet is established successfully, then the two time nodes of Terminator 2 and Terminator 3 will no longer exist, the old timeline does not exist, and the Skynet of these two time nodes (named the old skynet) will also It doesn't exist anymore, and Xintianwang directly adopted new technology and developed liquid robots, which is why the T1000 sent back to kill Sarah.
(Laotianwang is based on T800, and Xintianwang is based on the liquid robot technology brought back by Robot Connor)
Laotian.com realized that the establishment of Xintian.com meant that she would be completely eliminated from the timeline. Instead, the most threatening to her was Xintian. Na must exist. Once they die, the new Skynet will be born in the future, not the old Skynet. This is why the robot Conner called Schwarzenegger a "remnant of the original timeline." Therefore, Skynet sent T800 with Skynet data backup to protect Sara, and killed the T800 originally sent, leaving behind chips and robot debris, including the broken arm of the T800 robot that was torn off in the final battle. And there was an old policeman who saw them from beginning to end, and their existence left a mark on time.
In the end, Skynet survived, but no longer had the mission of destroying mankind. His mission became to protect Sarah Connor and Carl Rees and ensure his own existence. The villain behind the story was also replaced by a stronger Xintian. The net takes its place.
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