Given the question: Build a movie plot around this: What does Marty give Doc to save Clara? 2015-era hoverboard
The answer is:
On November 12, 1955, Marty McFly discovers that his friend, Dr. Emmett Brown is now trapped in 1885. Marty and Doc's 1955 self use the information in Doc's 1885 letter to locate and repair the DeLorean. Marty spots a tombstone with Doc's name, dated six days after the letter. Learning that Doc was killed by Biff Tannen's great-grandfather, Buford "Mad Dog" Tannen, Marty travels back to 1885 to save Doc.Marty arrives on September 2, 1885, in the middle of a United States Cavalry pursuit of Indians. When the fuel line is torn, Marty hides the car in a cave and walks to Hill Valley. He meets his Irish-born great-great-grandparents, Seamus and Maggie McFly, and runs afoul of Buford and his gang. Buford tries to hang Marty, but Doc saves him. Doc agrees to leave 1885, but because commercial gasoline is not yet available, the DeLorean cannot reach 88 miles per hour under its own power.Doc devises a plan to use a locomotive to push the DeLorean up to the required speed. While he and Marty explore a rail spur they intend to use, they spot an out-of-control horse-drawn wagon. Doc saves the passenger, Clara Clayton, and the two fall in love. Marty thwarts Buford's attempt to kill Doc at a town festival, whereupon Buford challenges Marty to a showdown in two days. Doc's name disappears from the photograph of his tombstone, but the date remains unchanged; Doc warns Marty that he might be the one killed by Buford.The night before their departure, Marty and Doc place the DeLorean onto the rail spur. At Clara's house, Doc tells her he is from the future, but she believes it is an excuse to end their relationship and angrily dismisses him. Distraught, Doc returns to the town saloon for a binge, but Marty rides to the saloon and convinces Doc to leave with him. Doc drinks a single shot of whiskey and passes out instantly. Buford arrives early and calls out Marty, but Marty refuses to duel. Doc revives after drinking the bartender's special "Wake-Up Juice" and tries fleeing with Marty, but Buford's gang captures Doc,...