Tex. Mezzosangue!

When Tex's justice strikes down on Edward Santos, his gang is destroyed and his criminal career cut short, but he only narrowly escapes death. He is saved and restored to health by the young half-breed Makua, who, in exchange for his help, asks Santos to train him in the use of the Colt before continuing on his own path.

But the paths of the old gunslinger in decline and the young, deadly half-breed gunman are destined to once again intertwine with those of Tex Willer and Kit Carson.