Despite Doc's requests not to visit him in the XIX century, Marty again wants to intervene in the course of events and is carried away in a time machine to 1885, towards the Wild West.
This journey, like all previous ones, is not without dangerous adventures, but brave Marty, risking his life, prevents a tragedy in the life of Emmett Brown. He, in turn, falls madly in love with a charming stranger whom he saves from death, and the trip home - to the future - loses all meaning for him.