Question: Can someone explain me what's the problem when Doc went to 1885? He's got the time machine with him, so why didn't he just come back?
Captain Defenestrator
20th Feb 2013
Back to the Future Part II (1989)
24th Jul 2010
Back to the Future Part II (1989)
Question: Why does Doc suddenly change his ideas (about time travel and not learning too much of your own future) in Part 2? In Part 1, he was determined not to learn too much about his own future, despite Marty trying to warn him that his life depended on it. But in Part 2, suddenly it's okay to bring Marty to the future and give him enough information to try to change the course of destiny for his son. Also, wouldn't it have just been easier to warn Marty about the accident he was going to have that caused his life to go so wrong to begin with? One would have to think that if Marty becomes successful and lives out an entirely different life, then maybe his son doesn't turn into such a wimp.
Chosen answer: Marty's saving his life with the note made him realize that some events are worth tampering with. He wasn't aware that Marty's entire life had taken a wrong turn, he'd just read that his son goes to prison after the robbery and takes action on that one thing.
9th May 2009
Back to the Future Part II (1989)
Question: We see Biff groan in pain as he returns to 2015 with the stolen DeLorean. In a deleted scene we actually see Biff fade away as he is erased from existence by his actions. I assume this is because an alternate Biff now exists (or could have been killed) and so he is erased from time. If this happens to Biff, why doesn't this happen to Marty, Doc, and Jennifer? They too are replaced by alternate versions of themselves when they return and even before they return to 1985a. 1985a Biff even says in the film that Marty was in school in Switzerland, and Doc has been committed, so they too should fade away as Biff did, shouldn't they? I would say "time" was giving them time enough to correct things like in the 1st movie, but Biff faded away almost a soon as he arrived back in 2015a.
Answer: I read somewhere the reason Biff faded away was Lorraine shot him in the alternate timeline for murdering her husband, George.
I hadn't heard that one, could be in a novelization or something. This is entirely my own speculation with nothing official to support it; however, it could be that because Doc and Marty are trying to correct the timeline, he and his siblings' removal from history happens gradually, as they get closer or further from the act of their trying to set things right. Biff doesn't know or care and is actively trying to change history, so the moment he returns to 2015, he vanishes all at once.
If you have the DVD or Blu-ray, watch the deleted scene of Biff vanishing and turn on the commentary. It will confirm that Biff was murdered, which is why he was erased from existence.
Chosen answer: Biff faded away because he completely changed his own past. When Marty, Doc, and Jennifer return to 1985, they're returning to the alternate timeline that Biff created. They still exist and remember their own history because without it, Biff's timeline couldn't exist and a paradox would be created.
Answer: The comics answer this question. In 1986 in the alternate timeline, Biff forced the committed Doc Brown to send him forward in time to get more sports results, but Doc tricked him and sent him back to 1884 instead, where he was shot by his own great-grandfather Buford. When he reappeared in his current time (that's how the time machine worked in this timeline), he was dead. Old Biff faded from existence because Biff never grew up to become Old Biff (because he was dead), so Old Biff no longer existed.
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Chosen answer: The unexpected jump brought on by lightning striking the DeLorean caused the circuits to fry. Since Doc didn't have the equipment to make new ones in 1885, he decided to hide the car and resigned himself to life in 1885.
Captain Defenestrator