Quote:
Originally Posted by Marty Mcfly III
But the Deloreon that did vanish was a temporal duplicate too and that one vanished.
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Truth be told, the trilogy was never really consistent about alternate timelines, and how long should it take for someone/something to get erased, and which VERSION should get erased...which I suppose is excusable because it was never planned as a trilogy in the first place...
In the first film, things were comparitively simpler and sort off consistent...Marty prevents his parent's first meeting and so creates what should logically progress into an alternate timeline where he and his siblings are never born...however because he is in the past, and from his POV, the 'critical' event that will determine his future existence (i.e. George and Lorraine's kiss on the dance floor) is in the future (which is not 'written') there is still a possibility that he will exist, so he doesn't fade out instantly...but each moment he draws closer to the 'critical event' the probability of his and his siblings existence decreases (represented by the fading photograph), and if on November 12th, he is unable to get George and Lorraine to kiss, his existence becomes impossible (its probability is 0) and he is erased. It made sense, within the convoluted movie logic at least.
But with BTTF2, the two Bobs went with a far more complex time travel plot, and decided to go beyond the mere
possibility of an alternate timeline which was just threatened in the first film, to actually HAVING an alternate timeline where Marty and Doc's history as they know it has been screwed over badly...now, by the logic of BTTF1, Marty and Doc should have faded from existence right there in 2015 along with Old Biff...their existence in their present form was impossible, because it was impossible in this timeline for both of them to even be present in 2015 (as the time machine wasn't invented) and they were way past the 'critical event' (whatever it was) which would have determined their fates...however, in order for there to be a plot, ti was decided that the timeline transformed around them and they were immune to the ripple effect by virtue of being outside their own time. However, when they return to 1985, they're in their own time, and by that logic, they should be erased...but they're not, so we're led to assume that the ripple effect doesn't catch up with them. So Marty and Doc spend something like 5-6 hours in a timeline they are not supposed to exist it, WAY past the so-called 'critical events' that determined their fate...okay, even if we claim that they shouldn't have faded because they're alive in this timeline, then why are the 'normal 1985' versions of them still around? Shouldn't they have faded/transformed into their 1985-A counterparts? If you assume there were no doubles in 1985-A, why did the 1985-A versions get erased, if they belonged to this timeline, as opposed to the normal 1985 versions who didn't belong? If you assume there were doubles, again, why should the anomalies from a previous timeline remain? And forget about Marty and Doc, why hasn't the DELOREAN faded because it most certainly has prevented its own existence? This is where the disconnect between how the ripple effect is depicted in BTTF1 and in BTTF2 comes about.
And the Game takes this even further...normal timeline Doc fades from existence as soon as he returns to his own time (i.e. 1986) because he is now past the 'critical event' (i.e. going to watch Frankenstien) that determined his fate and is no longer immune to the ripple effect. As per the logic of BTTF2, Doc should have been able to exist for a while, alongside normal Marty, in the FCB timeline, alongside the Citizen Brown version. Instead, he disappears and is 'replaced' by FCB Doc. By that logic, Marty too should have disappeared and been replaced by his FCB counterpart. Instead, he exists alongside his FCB counterpart and at no point seems to be in danger of fading from existance...why should the ripple effect work differently for Marty and Doc?
So really, from BTTF2 onwards, the space-time continuum has been increasingly chaotic with regards to shifting timelines and erasures...with the ripple effect working differently in different scenarios.