 Old Los Angeles (never known as "California Outpost" until 1953 when Republic re-issued it under that changed-title) finds Bill Stockton (Bill Elliott as William Elliott)leaving Missouri to join his brother Larry (Henry Brandon), and prospect for gold in California. Bill and his pal, Sam Bowie (Andy Devine), arrive in the picturesque town of old Los Angeles in 1848, but find that the outlaws rule...attacking mines and trains, burning ranches, looting stores and killing those who oppose them. Bill learns that Larry has been murdered for the gold claim he had staked for them. He sets out to avenge his brother s death but runs into difficulty when Estelita Del Rey (Estelita Rodriguez) misleads him to protect her lawless lover, Johnny Morrell (John Carroll.) Bill also suspects Luis Savarin (Joseph Schildkraut), gambling house proprietor, and Marie Marlowe (Catherine McLeod), an entertainer at Savarin s place.