After being fired from his job at a grocer, George, gets a job as a stableboy at a local stud farm run by the Fleming family. He befriends the horse Hotspur who is a favourite to win the Melbourne Cup, and develops a strong whistle which is used to make the horse run fast.
| Actor | Role |
|---|---|
 George WallaceGeorge | George |
 Frank HarveyBrian Winters | Brian Winters |
| CCampbell CopelinHarvey Walls | Harvey Walls |
 Thelma ScottDorothy Fleming | Dorothy Fleming |
 Harold MeadeMr. Fleming | Mr. Fleming |
| MMarshall CrosbyMr. Summers | Mr. Summers |
| NNick MortonNick | Nick |
| GGuy HastingsMr. Coyle | Mr. Coyle |
| NNorman ShepherdA Crook | A Crook |
| SStan RayA stablehand | A stablehand |
| JJohn DobbieA stablehand | A stablehand |
| DD'Arcy KelwayA Farmer | A Farmer |
| NNoel BoydHarvey's Secretary | Harvey's Secretary |
| DDan ThomasA Crook | A Crook |
 Marie La VarreMrs. Doyle | Mrs. Doyle |
| DDora MostynMrs. Carter | Mrs. Carter |
| FFrank CrowtherSlade | Slade |
| AArthur LysterNot listed | Not listed |
| MMilton RoyceHead Waiter | Head Waiter |