Question: Does the trilogy stick to a coherent time-travel-logic or is it "mix-and-match"? While it purports to adhere to the "one universe, many detours" theory (which is why Jennifer is save in bad 1985), it also delivers proof for the multiverse theory, unless it's "explained away" such as: Doc was never killed. He already wore a vest (and brought a gun to the meeting with a teenager) because he was a bit paranoid. Since he never really died, there's no parallel timeline required for him to stay dead.
Jon Sandys
3rd Jun 2022
Back to the Future Part II (1989)
Answer: Why wouldn't they exist? This is a serious question (maybe I am missing something). In BttF, Marty was disappearing because his parents weren't going to get together for him to even exist. In BttF II, his parents got together (Biff says so - he calls George Marty's father) and he was born, so it is very consistent between both movies. So even with an erased timeline, Biff did not erase Marty and his siblings being born. As for the linear time or multi universal, I think the movie is consistent - only the time traveler remembers things that happened before the time traveling began.
Answer: It's completely mix-and-match IMHO. The movies constantly switch between linear and parallel timelines, either making changes affect the time traveller or not, depending on plot convenience. For example, in the first movie Marty is in danger of disappearing unless he gets his parents back together, and fixes it before undoing all he had done himself, which causes a paradox. But then, when he gets back, his parents and siblings are completely different, but Marty is the same person that supposed lived that new life, unreplaced. That simply doesn't make sense in a linear timeline. In the second movie it is even worse, with Marty and Doc still existing in a timeline erased by Old Biff with the sports almanac, for plot convenience.
22nd Jan 2005
Back to the Future Part II (1989)
Question: In the alternate 1985, there is an alternate Biff, Lorraine etc. Shouldn't there also be an alternate Marty and Doc?
Answer: Yep, and there is, but they're both elsewhere. Doc's been committed to an asylum somewhere. When Marty first meets the alternate Biff, Biff tells him that he's supposed to be in Switzerland at boarding school - that's where the alternate Marty is.
Wouldn't someone probably see Doc and report that he escaped from the asylum?
Maybe, but no way to be sure, and they're not around long enough for that to be an issue anyway.
Answer: Doc would most likely not have been seen by anyone, as the time he spent in the alternate 1985 was primarily inside the DeLorean, at a boarded-up library, graveyard, and his lab (and all at night too) so most likely not spotted by the public.
Even if someone had seen Doc, it could've been dismissed as someone who looks like him. Even if they did report his escape, someone would either call or go to the asylum and verify Doc was still there.
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Answer: It's fairly consistent. Changes to the past affect the future, although the time travellers themselves are afforded a bit of convenient wriggle room, like time changing around them, changes not immediately taking effect, etc, so as ever some suspension of disbelief is needed. The timeline changes - originally Doc was killed, Marty went back, gave him a letter, Doc took precautions. That's not the multiverse, that's just the future being changed by actions in the past.
Jon Sandys ★