In the final chapter of the "Back to the Future" trilogy, Marty re-digs the reliable Droenin DMC-12 from the depths of the mine, traveling through time and space to find the missing Dr. Brown, but unexpectedly comes to the Wild West in 1885.However, when their time machine fails again, two future travelers are trapped in this land full of cowboys and gunmen, struggling. What's even more difficult is that the doctor hopelessly fell in love with the beautiful and kind female teacher Clara Clayton; while Marty faced the fierce and domineering Buford Tannon head-on, and was caught in a showdown about honor and destiny.In this strange and dangerous time and space, friendship, love and courage will face unprecedented tests.