The action of the film starts with Colonel Dodge (Henry O'Neill) arriving on the first train and subsequently opening the new railroad line that links Dodge City with the rest of the world. A few years later, Dodge City has turned into the "Texas longhorn (cattle) center of the world and wide-open Babylon of the American frontier, packed with settlers, thieves and gunmen—the town that knew no ethics but cash and killing". In particular, it is Jeff Surrett (Bruce Cabot) and his gang who kill, steal, cheat and, generally, control life in Dodge City without ever being brought to justice. Any new sheriff, sworn into office in Dodge, is quickly driven out of town by Surrett and his cronies.