Question: When Doc comes back at the end, it's to say goodbye to Marty, but what's stopping him from just staying in 1985 with Clara and their two sons? I mean, before Clara turned up at the train in 1885, Doc was all set to go to 1985 with Marty, and then when Clara showed up, Doc said that they'd have to bring her too because there wasn't much time left before the train ran out of track, and he couldn't just let her perish. So why doesn't he just stay in 1985 - that's where he was going to go before Clara turned up, and now that he has her, and a family, why not just settle down in 1985?
Heather Benton
23rd Oct 2020
Back to the Future Part III (1990)
Answer: Doc actually explains in Back to the Future: The Game. I recommend playing that as it continues where part 3 left off. Doc actually tells Marty that he wanted him to live his life without the complications of time travel. So he left and moved to another time period. I don't want to spoil the rest of the game if you haven't played it but it gets into most of your question in the game definitely should give it a playthrough.
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Answer: Because like Doc Brown, Clara has a thirst for adventure. An Old West lady being offered the chance to go back and forth in time. Also, to go to the final frontier, outer space. Besides traveling for them is like a vacation. They could settle in 1985 anytime they wanted.