 Marshal Matt Dillon (James Arness) is brought to Coreyville by Ellie Wylie (Jo Ann Harris) to ensure a fair trial for her father, Titus (Bruce Glover). In the process Matt must deal with the town matriarch, Agatha Corey (Nina Foch) and her sons Billy Joe (Kevin Coughlin) and Frank (Thomas Hunter). Flo Watson (Ruth Roman), the redheaded saloon keeper, plays a prominent part in the intrigue.