Roosevelt returns to the Badlands, where the Marquis de Morès grazes cattle on Elkhorn land, sparking a violent range war.
Roosevelt’s ranch faces danger when a stranger from Chicago investigates a missing associate, threatening both Elkhorn and the Marquis.
While Roosevelt helps catch a horse thief, Medora erupts after the Marquis de Morès is arrested for murdering a rancher.
Believing Roosevelt caused his arrest, the Marquis challenges him to a duel as rivals sabotage his refrigerated train car.
Roosevelt attends the Marquis’ murder trial, while Medora’s father urges her to abandon her husband and his violent ways.
Roosevelt aids a Sioux brave in finding stolen horses, while the Marquis struggles to repair his damaged reputation.
Chicago enforcers confront Medora’s cattlemen, clashing with the Marquis, while an Elkhorn man rides to Montana seeking help.
When a Chicago cattle baron invades with gunslingers, Roosevelt and the Marquis unite to defend Medora from destruction.