I saw this fan trailer a year or two ago and was very impressed by it, I could picture a whole Terminator 5 story based on this trailer like a video pitch to how they could’ve done it.
This is the story I pictured watching this trailer:
I pictured modern times with John and Sarah Connor, but Judgment Day doesn’t happen in 2004 like Terminator 3: Rise of the Machines showed. But why? John and Sarah go about their lives after Cyberdyne was destroyed, little do they know, that they’re being watched by someone, or something. That unbeknownst to them, that Terminators have been building a Terminator army in secret. When suddenly, the shit hits the fan! Skynet slowly takes over the internet while Terminators and HKs begin trying to exterminating the human race. When John and Sarah see this, they are saved by two people they never thought they’d see again, The Terminator and Kyle Reese, “Come with us if you want to live.” They get them to safety where they meet the new Resistance led by (future) John Connor’s daughter Jane. They explain that sometime after 2018 in Terminator Salvation, due to the Connors destroying Cyberdyne and postponing Judgment Day to 2004, Skynet was able to gain more information and the Resistance lost the war, so a handful of resisters, Connor, the Terminator, Jane, and Kyle included travel back in time as a last ditch effort to stop Skynet. Ironic, because in the previous movie, Skynet tried to do the same thing. They were able to stop Cyber Research Systems from developing the software that would become Skynet. But Terminators led by the T-1000 followed them into the past and between the aftermath of T2 in 1994 and current time were building a Terminator and HK army without quit waiting until now to upload Skynet to the web. Future John Connor had disappeared after stopping Cyber Research Systems, probably dead, but had a secret weapon to stopping Skynet once and for all and left clues behind to this secret weapon. So the Terminator, John Connor, Sarah Connor, Kyle Reese, Jane Connor, and what’s left of the Resistance must follow the clues to find this weapon and stop Skynet once and for all before he hacks into government nuclear weapons and beginning Judgment Day dodging Terminators and HKs of all kind. Destiny comes early. You know, like the final season of Fringe.
This is what the timeline would be like if this movie was made.
That’s what I picture when I watch this trailer, and it would be awesome to see Schwarzenegger, Hamilton, Furlong, Biehn, and Patrick all in the same movie together.
To answer you questions regarding Sarah and Kyle. I haven’t thought of an explanation of why Sarah would be alive after dying of cancer in T3, but the best explanation is that because of the Resistance preventing Cyber Research from developing Skynet they started a new timeline where Sarah never developed cancer, the butterfly effect. As for Kyle, the best explanation is that, the past is past, Kyle Reese already impregnated Sarah Connor, the Kyle Reese we saw in T1 and this Kyle Reese are from separate timelines. The one from T1 is Kyle Reese A, this is Kyle Reese B, the grown up version of Kyle in Salvation. This would also explain why in Salvation, Skynet didn’t just kill Kyle Reese, because killing Kyle would make no difference, this isn’t Back to the Future, instead used him as bait to kill Connor. This would also work for an interesting subplot, that John finally meets his father and Sarah is reunited with the man she loves, but she is conflicted because he’s not Kyle Reese A, he’s not the man who would die to save her and the father of her son. Time travel is a bitch.