Parmalee sends Reese, Chad and Joe to Porfirio to investigate Mexican bandits but find elderly Alvar de Aveles flying a Mexican flag over the jail on Alamo Day. Reese breaks into the jail, through the roof, and talks to de Aveles. As this happens de Aveles companions, unknown to or approved by him, rob the entire town, including Chad and Joe. When they emerge from the jail Reese is knocked out and taken prisoner. Chad and Joe must stop the Mexican Bandits before they cross the border with Reese. Since everything was stolen they have to acquire boots, horses, guns, etc. along the way. After crossing the border Reese is made to walk and Aveles willingly joins him. When Chad and Joe catch up Reese gets to fight the gang's leader, Paco Vargas.

Reese gets the drop on outlaw Johnny Rhodes but his horse Cactus is spooked by a rattler and Reese is thrown and knocked unconscious. Rhodes' horse is lame so he takes Cactus. When Reese wakes up he has amnesia and because of the horse with Rhodes name on it he is mistaken for the outlaw. Chad and Joe have been sent to track Rhodes in the hopes it will keep him too busy to attack a gold shipment. They come upon Reese in San Rosa and observe him as ""Johnny Rhodes"". They approach him as his ""outlaw"" buddies, assuming he is undercover. After their conversation they get the true picture of Reese's condition. Reese has Mio, the cantina owner with eyes for Reese, help him tie up Chad and Joe after they've been slipped knockout pills. The real Rhodes appears with his gang. They take Reese, Chad and Joe prisoner and tie them up in the cantina. Mio cuts their ropes and helps them fight off and capture Rhodes and his gang.