Synopsis by Hans J. Wollstein
A highly unusual Buck Jones Western, South of the Rio Grande featured the spectacle of Jones playing a Mexican Rurales officer named Carlos. Returning to the family hacienda, Carlos discovers that his weak-willed brother, Juan (Paul Fix), has lost everything to a scheming vixen, Consuella (Mona Maris). Deeply ashamed, Juan kills Consuella's partner, Andres (Charles Requa), before taking his own life. When one of his fellow officers, Ramon (George J. Lewis), becomes involved in a similar situation, Carlos remembers his own tragedy and decides to help the youngster. Ramon, it turns out, is also under the spell of Consuella, who now works for the evil Stark (Philo McCullough). Disguised as a peon, Carlos infiltrates Stark's lair, learning that the villain has found oil deposits on Ramon's family land. Unmasked by Consuella, Carlos is rescued in the nick of time by his fellow Rurales. Paul Fix, a busy supporting player in Westerns for six decades, had played a similar role in Jones' earlier The Avenger (1931) and a party scene was lifted from another prior Jones Western, Men Without Law (1930). Both Jones and fellow Columbia cowboy Tim McCoy enjoyed playing Mexican characters -- or gringos masquerading as such -- but as opposed to McCoy, Jones' phony accent left a lot to be desired.
bad-guy, cowboy, good-guy, outlaw [Western]