Fulfilling a long-time fantasy, Doc Brown (Christopher Lloyd) has decided to live in the Old West of the 1880's. But when he's in danger of meeting an untimely end, Marty (Michael J. Fox) travels back into the past to rescue him. There's just one problem: Doc is so smitten by schoolteacher Clara Clayton (Mary Steenburgen) that he's become a little...distracted. Now, it's up to Marty to keep Doc out of trouble, get the DeLorean running, and put the past, present and future on track so they can all get back to where - and when - they belong!