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Rex as Rex, the World's Greatest Horse (as Rex the Wonder Horse) |
 |
Jack Perrin as Jack Merritt |
 |
Helen Foster as Margie Smith |
 |
Tom London as Martin Trask |
 |
Starlight the Horse as Starlight, Jack's Horse |
 |
Jim Corey as Bit Role (uncredited) |
| Directing | Henry MacRae | Director |
| Writing | George H. Plympton | Writer |
| Writing | Gardner Bradford | Writer |
| Writing | William Lord Wright | Story |
