This is a classic example to Gunsmoke. Not only is the story itself rivoting to watch from a purely dramatic point of view but it also is a study in human nature on many fronts. First we see the strained marriage of wealthy couple and the loyalty of the wife towards her butler. Then we see the dedication of Doc to help people in need (even if the man - Morgan Woodward - doesn't want his help). We see how fear and the unknown can cause "sane rational" people to panic and lose control (by beating Matt and trying to burn people alive in the train). We also see the fear of a man who fears the panic of the townspeople. Just a well written and well acted Gunsmoke.
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