Fulfilling a long-time fantasy, Doc Brown has decided to live in the Old West of the 1880s.  But when he's in danger of meeting an untimely end, Marty travels back in time to rescue him.  There's just one problem: Doc is so smitten by schoolteacher Clara Clayton (Steenburgen) that he can't think straight!  Now, it's up to Marty to keep Doc out of trouble, keep the DeLorean running, and keep the past, present and future on track so they can all get back to where - and when - they belong!  Filled with all of the trademark Back to the Future gadgetry, action, imagination and humor, it's a spectacular finale to one of the most popular adventure-comedy film series of all time!