When Texas Ranger George Standish (Eric Norden), who has been pursuing an outlaw gang led by Mungo (Robert Lowery), is killed by Mungo, his brother, Bob Standish (Don 'Red' Barry), joins the Rangers, with his first assignment from Ranger Captain McLain (Lyle Talbot) the capture of the Mungo gang, who hide out below El Paso in Mexico. Bob takes the identity of an outlaw he was forced to kill in the line of duty, and goes below the border with the plan of luring Mungo and his gang back to El Paso and into a trap set by the Rangers.