Terminator

Short Answer: Bridge to the Matrix

Skynet, growing weary of all the time travel that never seems to solve anything, decides that if it can't beat the humans, it will make them join it... and evolves into The Matrix. 

Instead of fighting the humans, it makes a deal with them and strikes a truce: they can live in-- as far as their minds know-- the world they used to know. But their bodies will power the system, and the machines will remain in charge.

Most agree to stop fighting and instead of living in a hellscape, live in bliss, even if it is only all a life-long dream. 

Or course, some still hold out, and in the second half of the film, we see Morpheus and the rest of the crew (or younger versions thereof) assemble the resistance infrastructure we see in the Matrix films and begin their search for Neo. 

So this movie would tell that story, and retcon the entire Terminator storyline as a prequel to the Matrix... or retcon the Matrix as the sequel to the Terminator story.