Back to the Future Part III (1990)

The conclusion of the trilogy sends Marty McFly on a rescue mission to the year 1885, where he must save Doc Brown from death at the hands of yet another member of the Tannen clan. However, there are a number of complications preventing a quick return to the future: a lack of gasoline for the time-traveling DeLorean, a band of gunslinging outlaws and a schoolmarm with affections for the smitten Doc.