John Reid had been one of a posse of six Texas Rangers tracking a gang of desperadoes. The Rangers were lured into an ambush in a canyon, and five of them were killed. The sixth, young John Reid, after being left for dead, was found and nursed back to health by a friendly Indian named Tonto. Reid had once helped Tonto and the Indian now vowed to stay with him and the "lone" Ranger sought to avenge the deaths of his comrades. Avenge they did, cornering the outlaw Butch Cavendish in a dramatic battle. Reid buried his past at the graves of the five dead Rangers, donned a mask, and set out with Tonto to avenge wrongs throughout the Old West. (Tim's TV Showcase)