In 1955, Marty McFly discovers that his friend Dr. Emmett "Doc" Brown is now trapped in the year 1885. Marty and Doc's 1955 self use the information in Doc’s 1885 letter to retrieve and repair the damaged DeLorean. As they retrieve the car, Marty spies a tombstone with Doc's name, dated six days after the letter. Learning that Doc was killed by Biff Tannen's ancestor, Buford "Mad Dog" Tannen, Marty decides to go back to 1885 to save Doc.
Marty arrives on September 2, 1885, in the middle of a U.S. Cavalry pursuit of Indians. While evading the pursuit, the car's fuel line is torn, and Marty hides the car in a cave. While walking to Hill Valley, Marty meets his Irish great-great-grandparents, Seamus and Maggie McFly. To disguise his identity, Marty adopts the name Clint Eastwood. In town, Marty runs afoul of Buford and his gang. Buford tries to hang Marty, but Doc saves him. Doc agrees to leave 1885, but with the fuel tank in the DeLorean empty and gasoline unavailable, there is no way to power the car to 88 mph. Doc devises a scheme to use a locomotive to push the DeLorean up to speed. As Doc and Marty explore the rail spur they intend to use, they spot an out-of-control horse-drawn wagon. Doc saves the passenger, Clara Clayton. The two fall in love, finding many common interests, especially the works of Jules Verne. Buford tries to kill Doc at a town festival, but Marty intervenes. Buford then goads Marty into a showdown in two days' time. Consulting the photograph of Doc's tombstone, they note that Doc's name has disappeared, but the tombstone is otherwise unchanged. Doc tells Marty that the tombstone represents the events of the future, and warns Marty that he, not Doc, may be killed by Buford.
The night before their departure, Doc confesses to Clara that he is from the future, but Clara believes it is merely an excuse to end their relationship and spurns him. Distraught, Doc returns to the town saloon to get drunk. Marty rides to the saloon and convinces Doc to leave with him. Unfortunately, Doc drinks a single shot of whiskey and passes out. Buford arrives and calls Marty out. Marty realizes his reputation is unimportant and refuses to fight. Doc revives after being force-fed the bartender's special "Wake-Up Juice" and tries fleeing with Marty, but Buford's gang captures Doc, forcing Marty to fight. Marty uses a firebox door from a stove as a bullet-proof vest, and then hits Buford in the face with it. During the fistfight that follows, Buford destroys the tombstone (which disappears from the photograph) and is arrested. With Buford no longer a threat, Marty and Doc depart to hijack the locomotive.
Clara is leaving town on the train when she overhears a salesman discussing a man he met in the saloon, despondent about his lost love. Realizing the man is Doc and that he loves her, Clara triggers the emergency brake and runs back to town. She discovers Doc's model of the time machine and rides after him. Clara boards the speeding locomotive while Doc is climbing towards the DeLorean. Doc encourages Clara to climb out to him, intending to bring her to 1985. As she climbs to Doc, the overheated locomotive boiler explodes. Clara falls off and is left hanging by her dress. Marty passes his hoverboard to Doc, who uses it to save Clara. They coast away from the train safely as the DeLorean disappears through time, while the locomotive roars over the edge of the incomplete bridge and is demolished.
Marty arrives safely on October 27, 1985, but the powerless DeLorean is destroyed when a freight train strikes it head-on. Marty returns to his home, discovering that everything has returned to the improved timeline. Marty finds Jennifer sleeping on her front porch. Later, Marty uses the lessons he learned in 1885 to avoid being goaded into a street race with Needles, avoiding a potential automobile accident. Jennifer opens the fax message she kept from 2015 and finds that the message regarding Marty being fired has been erased.
Marty takes Jennifer to the time machine wreckage. As they survey the remains, a steam-powered locomotive equipped with a flux capacitor appears, manned by Doc, Clara, and their children, Jules and Verne. Doc gives Marty the photo of the two of them by the clockworks at the 1885 festival. Jennifer inquires about the fax and asks what it means. Doc tells them it means that the future has not been written yet and that theirs is "whatever you make it, so make it a good one". After the Browns bid farewell to their friends, Doc’s train converts into a hovertrain and roars off into an unknown time.
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