In 1866, U.S. Marshal Jack Flynn and his friend, Clay "Pony Kid" Foster, spend two weeks in West Texas and Southern New Mexico in search of Booth Watkins, a notorious outlaw who murdered many innocent people and who has a $500 bounty on his head. The two lawmen find a terrible scene on a road in the barren Chihuahuan Desert, which they realize was caused by the Watkins Gang. A $500 bounty on Booth Watkins' head spurs the lawmen to capture the...