Timeline 40 was a timeline created when Dr. Emmett Brown traveled from May 14, 1986 to October 13, 1931.



  • 1931
    • Tuesday, October 13: Doc arrives and Hill Valley disappears. Doc and Marty talk to Edna, who reveals that she went to July 17, 1876. After being saved by William McFly, they go to July 17, 1876. This creates Timeline 41, which begins at Doc and Marty's entry point on July 17, 1876.  
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