Action star Phil Carey once more dons Cavalry Blue in Columbia's Massacre Canyon. This time, Carey plays the unsavory role of an alcoholic Cavalry lieutenent who fancies himself an expert on Indians. In truth, only his sergeant, Douglas Kennedy, possesses enough knowhow for the task at hand: To transport a wagon train full of weapons into Indian territory without arousing suspicion. Thanks to a stupid blunder, Native American chief Steve Ritch discovers that the army is trying to ship guns through his land, and the chase is on. Evidently as a means to enhance the film's box office, Massacre Canyon costars two attractive but totally unnecessary leading ladies, Audrey Totter and Miss Jeff Donnell (as she was often billed).