Vietnam veteran and drifter John J. Rambo (Sylvester Stallone) wanders into a small Washington town in search of an old friend, but is met with intolerance and brutality by the local sheriff, Will Teasle (Brian Dennehy). When Teasle and his deputies restrain and shave Rambo, he flashes back to his time as a prisoner of war and unleashes his fury on the officers. He narrowly escapes the manhunt, but it will take his former commander (Richard Crenna) to save the hunters from the hunted.
In this final chapter, Marty McFly (Michael J. Fox) obtains a 70-year-old message from the time-traveling Dr. Emmett Brown (Christopher Lloyd), in which he informs Marty that he has retired to a small town in the Old West. Marty then finds out that the Doc was murdered shortly after sending the letter. In order to save his friend, Marty will have to travel back in time, disentangle a lovestruck Doc from a local schoolmarm, and repair the DeLorean — all while avoiding a posse of gunslingers.