In the tumultuous aftermath of President Grant's ultimatum in 1876, the Great Sioux War ignites as tensions between the US government and Plains Indians reach a breaking point. Grant's deadline threatens to treat any non-reservation Indians as enemy combatants, spurred by the discovery of gold in the sacred Black Hills, triggering a struggle for sovereignty and survival. Led by figures like Sitting Bull, who vehemently opposed reservation life, the Plains tribes unite in defiance, culminating in the legendary Battle of the Little Bighorn. Amidst the chaos, Sitting Bull's spiritual leadership and vision guide his people through the conflict, ultimately reshaping the course of history in the face of overwhelming adversity.