Back to the Future. Part III

Marty McFly receives a letter from his friend Doctor Emmett Brown from 1885 in which he ask him for help so he has to repair the Delorean time-machine, hid on a mine outside Hill Valley, next to a ancient cementery, where they find Doctor Brown's grave from 1885. Therefor Marty has to travel back in time to find Doctor Brown and save him. Hill Valley from 1885 is a small village that recreates the wild west. Marty McFly introduces himself as Clint Eastwood so nobody would know his real name as he meets his ancestors in there. Marty would have to fight a duel with Bufford Tannen, Biff Tannen's grandfather, just to save his scientific friend from his early death and find his way home back to the future.