New answers tagged back-to-the-future
Marty was in the time machine when he came back. The definition of the time machine is that the machine (and what it contains) travel through time unaltered. (My real question would be, why is there just ONE Marty when he comes back to 1985 after fixing his family. There should be one Marty that was born from his parents on his normal birthdate, and one ...
They blew up the engine when they first tried to get it running on whiskey, therefor not having enough time to repair the engine before doc's murder and if they had switched engine parts ir still would have changed space time continuum because the engine parts would not have been availble until the early 80's for the delorean
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