Corrected entry: In the beginning, Doc and Marty meet at the Twin Pine Mall, and we learn that Doc has built a time machine, which runs on plutonium. He has a heavy case filled with several containers of plutonium, one of which he inserts into the DeLorean. Doc is then killed and Marty flees to 1955. When he goes back to 1985, he plans to get there ten minutes early in order to prevent Doc's death. However, the car runs out of gas and Marty has to run to the Lone Pine Mall on foot, thus getting there too late. He is devastated that Doc is dead. Why? There is more plutonium two feet from him, in the truck. He can just take some, put it in the car, and come back ten minutes early again--or thirty minutes, or an hour, or a day, or whatever he wants.
rbryant73
26th Apr 2003
Back to the Future (1985)
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Correction: True, but this solution probably wouldn't occur to him moments after he saw Doc murdered, so it is conceivable that he would grieve for a while and then hit on the idea if Doc hadn't been wearing body armor.