When his master is attacked and left speechless, Ranger is held responsible. On the lam from the Law, the canine hero links up with telegrapher Bill Brady and Bill's girlfriend Helen Meadows. He gets a chance to clear his name by helping Bill trap a pair of outlaws who plan to blow up a mail train and abscond with the loot.

• Robertson-Cole Pictures Corporation
• Ranger the Dog
• Helen Foster
• Rex Lease
• Alfred Allen
• Harry Tenbrook
• Bruce Gordon
• Spencer Bell
• Victor Allen