Where did original Doc go? And where is the new Marty?

[sn939]

Originally Posted by Michael J Fox is Canadian

It really doesn't make sense for 2 of the same person to co-exist in the same timeline at the same age. As of right now in the trilogy and game the only time we see the other self paradox is when someone travels to the future or past OR when one leaves via time travel. Had marty remained in any of the alternate timelines it wouldnt make sense for him to remain there with an other self. And remember the lone pine/eastwood timeline IS an alternate timeline and the only 'other' marty is the one near the end of part one where he returns prior to leaving

It does make sense if the alternate self didn't time travel.

And they wouldn't be EXACTLY the same age.

In BTTF2, the Marty of the Hell Valley timeline would have been at school in Switzerland. He likely wouldn't even have KNOWN Doc, let alone time traveled.

'Our' Marty (the Twin Pines/Lone Pine Marty) is actually over a week older than Hell Valley Marty owing to his time travels.

And 'our' Marty spent a few hours at least co-existing with his alternate self.

The movie DOESN'T answer the question of when, if ever, would 'our' Marty start to fade from existence since the alternate Marty hadn't time traveled.

Of course, going by the original explanation intended by the Bobs, the alternate Marty would simply have disappeared from his boarding school on the morning of October 26th 1985, pulled through a 'space-time warp' and been deposited as 'our' Marty in 1955. Then again the original script involved the time machine being a refrigerator, so one wonders how much one can use from there to interpret the actual trilogy...