George is a disaster-prone zoo attendant who accidentally discovers a substance that accelerates motion, enabling his greyhound to run faster. This attracts the interest of a gang of criminals, who kidnap George's dog and plan to substitute their own in an important dog race. George and his friends defeat the crooks and their dog wins the race.

Charles Chauvel's 1940 cinematic tribute to the mounted troops of the Australian Light Horse regiments is a rousing call to arms, giving life to the heroic tales of mateship during the Great War.