This is going to be horrible, but...
BACK TO THE FUTURE: TERMINATION
At just 17 years of age in the year 2029, Linda McFly has proven to be one of the most versatile and resourceful soldiers in the war against Skynet, a status that's not all that hard to accomplish when you've managed to survive all your life in a world overrun with Terminators and HKs. Now, however, following what was supposed to be final victory over the Machines, evidence has been uncovered of the true extent of Skynet's last-ditch strategy - temporal deployment of a number of Terminators not just to specific points in Earth's past, but across a number of alternate timelines, thus extending the possibility of Skynet's survival in multiple realities. It's also discovered that, following the computer acquiring the ability to observe these different realities, Skynet's actual achievement of physical temporal displacement may have resulted from its discovery of a human scientist's handiwork in one of those realities, in that timeline's version of her family's old hometown of Hill Valley, California. Furthermore, in that timeline, that scientist was a close friend of Linda's long-deceased grandfather Marty, and if Skynet's now-decrypted findings are accurate, it was Emmett Brown who first unlocked the secret of time travel in early November 1955 - a secret whose overall aim Skynet was able to duplicate, if not exactly its execution, so fragmentary is the information the computer could find. In any case, it seems clear that preventing the secret of time travel from being discovered in the first place would undo much of Skynet's intentions, and Linda volunteers to go back to 1955 Hill Valley to assassinate Doc before he can put his theories to the test.
There are a few complications to this plan, however. First is a reserve unit of Terminators that Skynet has kept in cold storage to be immediately reactivated following its own termination, with the intent of destroying Skynet's compound and any human still in it, thus covering the computer's tracks. Then, once the humans are repelled from the temporal array, one of the Terminators fleshes up and gives chase on Linda back to 1955 while the others immediately blast the fortress to atoms. To add more inconvenience to Linda's quest, she arrives at Young Doc's mansion at the same time as her grandpa, who, having already witnessed Doc's supposed death at the hands of the Libyans in 1985, is determined to keep Young Doc out of her sights, and that's not going to be easy when you consider Linda's uncanny resemblance to her great-grandmother Lorraine, let alone her ability to turn pretty much anything in reach into a deadly weapon. And, as if all of THAT weren't enough, the Terminator quickly determines just where and when both it and its target have arrived, and the old "terminate the enemy's predecessors before the enemy can be born" contingency kicks in, which endangers not only Marty, but Lorraine as well...and any innocent caught between them and the Terminator.
When it's all done, half of Hill Valley has been blown to smithereens, a number of townsfolk are dead, Lorraine knows Marty's her kid, and the prospects of Marty going back to the future as HE remembers it look pretty bad...until a weird flying-saucer thing suddenly pops in, and out step a strangely familiar, if somewhat more disturbing, pairing of an anxiety-ridden teenager and a crazy-eyed, wild-maned scientist...
"Oh, geez, Rick! This is horrible! I've seen 'Back To The Future' a hundred times, and this isn't the way it's supposed to end!"
"'Burp' No ****, Morty! That's what happens when you try to cross fictional realities together! Not so glad I tweaked the portal gun after all your incessant begging, are ya, fanboy?"
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