Synopsis by Hal Erickson
Inheriting the props, costumes and much of the stock footage from Columbia's previous Ken Maynard series, Bob Allen rides tall in the saddle in Rio Grande Ranger. The villains are a band of outlaws who manage to elude the authorities by high-tailing it across the border to Mexico. Sheriff Bob takes on the baddies by posing as an outlaw and joining the gang. His ruse almost works, but he's forced to blow his cover to save the life of heroine Sandra (Iris Meredith). Will this be one picture in which the guys in the black hats come out on top? In all, Bob Allen appeared in six westerns for Columbia, each incorporating the word "Ranger" in the title.
bad-guy, good-guy, lawman, outlaw [Western], Texas-Ranger