The DeLorean, thought to be destroyed, reappears, and Marty travels to the year 1931 to rescue a time-stranded Doc Brown, who has been accused of burning down a speakeasy and put in jail. To break him out, Marty must work with Doc's younger self to build a rocket drill (in the process, Marty gives a subpoena to his grandfather Arthur to arrest Biff's father Kid Tannen for his wrongdoings). Doc is suddenly moved to another jail, so Marty races after him on a rocket powered bicycle and frees him, but as they prepare to go back to 1986, Marty's hand suddenly begins to disappear.
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