In 1985, '89 and then in 1990 , Marty McFly [Michael J. Fox] and Doc Brown [Christopher Lloyd] went back in time to 1955 then forward in time to 2015 and then farther back in time to 1885 through the 3-part Back to the Future trilogy. I'm a great fan of the trilogy, and I love to watch the entire series with the director's commentary that explains how a lot of shots were done. But a Back to the Future 4? What do you think? Should they make a sequel?