A stallion known as "The Black" is the leader of a band of wild horses. A cowboy is determined to capture and break him.
| Actor | Role |
|---|---|
 RexThe Black (as Rex the Wonder Horse) | The Black (as Rex the Wonder Horse) |
 Edna MurphyMary Fielding | Mary Fielding |
 Léon BaryBilly Blair | Billy Blair |
 Charley ChaseBoyd Fielding (as Charles Parrott) | Boyd Fielding (as Charles Parrott) |
 Pat HartiganWade Galvin | Wade Galvin |
 Sidney De GrayJohn Fielding | John Fielding |