In 1933 at a country fair in San Francisco, a young boy named Will is attending a Wild West exhibition. Will comes across a seemingly ordinary mannequin that is revealed to be Tonto, an elderly Comanche spirit warrior, who proceeds to recount his experiences with lawyer John Reid.Shifting to 1869, Reid is returning home aboard a railway, managed by railroad tycoon Latham Cole, en route to Colby, Texas to visit his older brother and Texas Ranger, Dan Reid. Unbeknownst to John, the train is also carrying Tonto and outlaw Butch Cavendish, who is being transported for hishanging after being apprehended by Dan. Cavendish's gang, however, hijacks the train, which derails soon after, resulting in Butch escaping and Tonto's arrest by John and Dan. The elder Reid recruits John as a Texas Ranger and the two are enlisted to track down the Cavendish gang alongside a group of five other Rangers. A few days into their expedition, the group is ambushed in a canyon by Cavendish's men who kill the Rangers, including Dan, who has his heart cut out by Butch himself. John is injured in the attack and passes out, only to be found by Tonto days later. When Reid awakens, he is informed by Tonto of his immortality and that one of the Rangers betrayed Dan and is, in fact, working alongside Butch. Reid and Tonto hunting for Butch and his gang throughout the desert with a white horse which believed to be sacred by the Indians.
