Dennis Weaver no longer was in the shadows of Gunsmoke
But also kind of didn't keep his cowboy image away
Playing US marshal Sam McCloud, escorting a witness back to NYC to stand trial
Along the way, he looses the man and now has to have NYPD to help him
Mayor of NYC likes the way McCloud works and asks him to stay as a liason to NYPD, much less to their chargin
He is an old-fashioned cop and prefers cowboys methods to solving crimes.