Purchasing the Carney Carnival and Road Show, unscrupulous sportsman Martin Trask assumes he has ownership of Rex, the world's greatest trained horse, and its rider, Margie Smith. The girl releases Rex, flees from Trask in a runaway wagon, and finds shelter with young cowboy farmer Jack Merritt, with whom she falls in love.
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)
