Roy Rogers (Roy Rogers) and his traveling Western show decide to rest at the ranch of Col. Harkrider (George Cleveland), who once co-owned the carnival with Roy's father. The colonel's daughter, Kay (Dale Evans), hopes that the visiting performers will reinvigorate her father, and that he will again go out with the circus. But Roy and friends are suddenly called into action when bad guy Manson (Grant Withers) releases a killer horse into the herds of area ranchers.