So to real quick clarify the story is based on a alternate timeline of what Rise of machines for those that watched the movie
here is somethings to know about in it originally.

John Actually died in July 4th 2032

Katherine became leader and sent the T-850 to safeguard John and herself.

Now as you may know after probably looking at the tab comparing it right now chapter 0 is important to read considering
some points to look at but in the stories timeline it goes like this.

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