Bat Masterson roams the frontier and defends the innocent.

Bat arrives in town too late to stop the Dakota boys from killing his friend, the sheriff; when the town asks Bat to take over the position, Bat provides another option.

Bat helps a woman and her son break away from the Doolin gang and flee to St. Louis, but the boy feels a strong attachment to the criminals that he considers family.

Bat makes an appeal to the governor to pardon a gunfighter because of his father's war service.

Bat becomes the only remaining witness for the prosecution in an upcoming murder trial in Wyoming as the father of the accused man either intimidates or kills anyone able to testify.