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.

George Wallace
George

Frank Harvey
Brian Winters
Campbell Copelin
Harvey Walls

Thelma Scott
Dorothy Fleming

Harold Meade
Mr. Fleming
Marshall Crosby
Mr. Summers
Nick Morton
Nick
Guy Hastings
Mr. Coyle
Norman Shepherd
A Crook
Stan Ray
A stablehand
John Dobbie
A stablehand
D'Arcy Kelway
A Farmer
Noel Boyd
Harvey's Secretary
Dan Thomas
A Crook

Marie La Varre
Mrs. Doyle