Here's an Idea how Marty could've not disrupted the Space Time Continuum..
Well at least not that much. You remember how Marty said that he could go back in time and save Doc before he got caught? But then Doc said that then that might result in the Delorean not going back to 1986 and telling Marty to go back for Doc and it would "end the universe as we know it". Well why couldn't Marty go back and rescue Doc and go back to 1986 without using the Delorean that Doc used to go to 1931? What I mean, if Marty went back to the time the speakeasy burned down, there would be two Deloreans. He just wouldn't have to use the one Doc used to go to 1931, but instead use the one that brought him (Marty) to 1931! Isn't that a brilliant idea!
Now he doesn't need to subpeona his grandfather or drive a rocket powered bike or steal a hat full of peanuts!
Now he doesn't need to subpeona his grandfather or drive a rocket powered bike or steal a hat full of peanuts!
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They'd have to find a way to have the first Delorean use its auto-retrieval feature and have Einstein drag Edna Strickland's shoe into it, since that would be the only way to faithfully preserve the chain of events.
Then, the only problem would be that Doc Brown's photo would never been in one of Edna's newspapers, but all in all Marty would still have an excuse to go back.
I'm not sure any of that makes a difference, because if you recall, the reason Marty went back to the 1880s in Back to the Future III is because he found out that Doc got killed by Mad Dog Tannen, and the changes he made in the past, saving Doc Brown's life, removed any necessity for him to make the decision to go to the past.
This is a big hole in how the series explains time travel.
People bring that one up a lot, but I can't look at Marty and Doc's relationship and believe that Marty wouldn't go back to get Doc, even if there was no tombstone.
Yea, I could go along with that, though the changes would have to be completely asynchronous with the natural course of events.
Even if you assume Marty is from a different reality than the timeline he's in, you still have to explain why there isn't a duplicate Marty in the future, since the one in the alternate timeline wouldn't have left.
....the alternate Marty would simply have to 'disappear' at the time that the original Marty left.
Kind of the reverse of disappearing when you prevent yourself from being born.
But that would also mean that Doc Brown's reasoning in this episode doesn't make sense.