The Life and Legend of Wyatt Earp - Season 4 (1958)

A mysterious killer has ambushed and killed nine people in the Robbers' Roost country of Utah. Wyatt's old Army friend, Colonel Benteen, begs him to take the case so that the cavalry may be saved in the event of an Apache attack. And before Wyatt is through he has to enlist the aid of every notorious outlaw in Robbers' Roost to get the mysterious killer and those behind him.

In his most energetic disguise, that of a cowhand, Wyatt Earp is after the murderer of a cousin and joins a cattle outfit coming up the Chisholm Trail. The Outfit is commanded by a devious tyrant who has unique punishments for those who offend him. Wyatt, suspecting him early, is put through a tough time.