In the 1930s, an elderly Tonto tells a young boy the tale of John Reid, the Lone Ranger. An idealistic lawyer, he rides with his brother and fellow Texas Rangers in pursuit of the notorious Butch Cavendish. Ambushed by the outlaw and left for dead, John Reid is rescued by the renegade Comanche, Tonto, at the insistence of a mysterious white horse and offers to help him to bring Cavendish to justice. Becoming a reluctant masked rider with a seemingly incomprehensible partner, Reid pursues the criminal against all obstacles. However, John and Tonto learn that Cavendish is only part of a far greater injustice and the pair must fight it in an adventure that would make them a legend.
In 1933, in San Francisco, a boy visits the Wild West in a sideshow and meets an elderly Tonto in a chamber and the Comanche tells the story of The Lone Ranger to him. In 1869, the idealistic prosecutor John Reid returns by train to his hometown Colby. In the same train, it is traveling the criminal Butch Cavendish that will be judged for his crimes and hanged in the town due to a request of Latham Cole, who represents the railroad company. However, Butch escapes and John rides with his brother Dan Reid and six other Texas Rangers to capture him. However, the rangers are ambushed and killed by the notorious outlaw and his gang and only John survives. He teams up with Tonto to bring Butch Cavendish to justice in a dangerous journey of discoveries.