Bill Underwood, a young cowhand, chooses to leave his family's stage line business to work as a cowboy, alongside his friends Smokey and Whopper. However, their lives are turned upside down when they foil a stagecoach robbery, only to discover that Bill's father's agent, Steve Farley, is secretly working against him. Bill takes on a new identity and becomes a stage driver for the Kelloggs, but his cover is blown and he's fired by Nancy Kellogg. Determined to protect the mail contract, Bill and his friends take matters into their own hands and hijack the stage, delivering the mail safely to its destination.
Thundering Hoofs
A young man named Bill Underwood leaves his family's stage line to become a cowhand, opting for a life of freedom and adventure over taking on the responsibility of leading the business.