Mary Steenburgen joins the cast for this rousing conclusion to the popular series. Stranded in 1955 after a freak burst of lightning, Marty must travel back to 1885 to rescue the Wild West Doc Brown from a premature end. Surviving an Indian attack and unfriendly townsfolk, Marty finds Doc Brown is the local blacksmith. But with the Doc under the spell of the charming Clara Clayton, it's up to Marty to get them out of the Wild West and back to the future.