The very beginning of “Back to the Future Part III” references the first two films, as the second and third films were shot at the same time and released within months of one another, but things are pretty well recapped so that someone could very easily understand everything in “Part III” without ever seeing the first two entries. After Doc Brown disappears in the DeLorean, leaving Marty in 1955, Marty must team up with 1955 Doc to chase after him. Marty goes back to 1885 and ends up finding Doc in the old American West, living in a frontier town. Marty, with foreknowledge of the future, knows that Doc is going to die in about a week, and tries to convince him to fix the DeLorean and head home. Unfortunately, the two need gasoline in order to get back to the future and are working on getting some when Doc falls in love with a woman named Clara (Mary Steenburgen) and decides maybe he doesn’t want to go back at all.
Marty manages to get some help from his ancestors, played by Fox and Lea Thompson, who played his mother in the first film, and it’s honestly a total blast seeing Fox act with himself. The special effects are pretty incredible for their day, giving Marty the chance to interact with his great-great-grandfather Seamus and allowing Fox to play two members of the McFly family. (It also gave him the chance to play a character closer to his own age at the time!) Seamus helps impart some important lessons to Marty and helps him become a better, more mature young man.
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