In the movies previous to *Terminator: Dark Fate*, the AI of the future was Skynet, which was (via a causal time loop) bootstrapped from the remains of the original Terminator.

But in *Dark Fate*, Skynet never appeared in the future and instead Legion apparently took its place.

But how did Legion come about? *Terminator 2: Judgement Day* seemed to put to rest the idea of bootstrapping an AI from the future. Or was there other Terminator parts not destroyed in *Judgement Day*?

Or (as a comment from [this](https://scifi.stackexchange.com/q/228656/67168) question)

> 
> Genisys strongly implies the existence of multiple timelines
> 
> 
> 

So that anything is possible in the multiverse?