A prison wagon is transporting Rudy Croft to Yuma for execution but stops off at the McCain ranch with the guards looking to buy a couple of bottles of liquor. Lucas sends them on their way and they eventually get their liquor in town. While drunk and asleep, Croft escapes and the two guards hatch a plan: they'll put Lucas in the wagon and pass him off as Croft when they get to Yuma. While Lucas is their prisoner, Mark returns to the ranch to find the wounded Croft lying in wait.
—garykmcd