The Lone Defender

A prospector is murdered by The Cactus Kid and his gang, who hope to find the murdered man's goldmine. The miner's dog, Rin-Tin-Tin, recognizes the killers, who thereafter seek to use the dog to locate the lost mine. With the help of a government agent and a young girl, Rinty saves the mine and brings the bad guys to justice.

• Richard ThorpeDirector
• William P. BurtScreenplay
• Bennett CohenScreenplay
• Harry L. FraserScreenplay

• Rin-Tin-TinRinty
• Walter MillerRamon
• June MarloweDolores Valdez
• Josef SwickardJuan Valdez
• Buzz BartonBuzz
• Lee ShumwayAmos Harkey
• Julia BejaranoMaria, the Dueña
• Lafe McKeeSheriff Billings
• Arthur MorrisonLimpy
• Frank LanningBurke
• Bob KortmanJenkins
• Victor MetzettiRed