Question: Doc Brown strongly believes that nobody should ever find out about their own future. With such a strong conviction, why would Doc tell Marty that his children going to prison is the one event that would ruin the whole McFly family?
MasterOfAll
2nd Feb 2015
Back to the Future Part II (1989)
28th Oct 2014
Back to the Future Part II (1989)
Question: OK, hope I'm articulating this properly: when Marty returns to 1985 from 2015 with Jen and the Doc, he places Jen at the porch of her own home. At this point, he hasn't realised yet that he's actually in an alternate 1985, because old Biff has discovered the time machine, and taken the Sports Almanac to the Biff of 1955. We all know what happens from there: Marty and the Doc now have to go back to 1955 (again) to stop Biff from getting the almanac, thus making the upcoming 1985 timeline "correct." Well, as they are successful...how come Jen is OK? Surely, as she was left in the alternate 1985 and isn't really in the "correct" 1985, she now fails to exist when Marty comes back to the "correct" 1985 to collect her at the porch? She must disappear with the alternate 1985? Or am I over thinking this?
Answer: According to Doc, the timeline fixed itself around her. The best explanation I found online was since she was from the original 1985, when everything reset, it was as if she was still in the original timeline.
Answer: Because when Marty arrived in 1885 and reunited with Doc, he told him "God, Jennifer I hope she is all right Doc, I can't believe we just left her there" to which Doc replies that when Marty burned the Almanac in 1955 the timeline was restored. This is proven when the newspaper reveals that George McFly honored and Doc Brown commended.
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Answer: At the end of the first film, Doc says, "what the hell" in response to the letter Marty gave him. So this shows it is not that strong a conviction, especially in the face of definite knowledge about something bad happening. It is also a way for Doc to repay Marty.
MasterOfAll