Another more dangerous Indian tribe has taken over where the Comanche left off. As the saying goes, enjoy the Comanche, the Commatoa are coming. The Commandant, Captain Blue and the Diablo Kid are working together to thwart a plan to destroy Fort Sheridan and the nearby town of Marion. Using the Commatoa Indians and some of the officers in the fort itself, unscrupulous people are determined to destroy the Fort and all that it stands for.