A range war is brewing between the Bar 20 and Meeker ranches, which is being caused by Meeker's foreman Anthony (who is in reality, an outlaw called the Pecos Kid), whose method is to have each ranch be accused at acts of rustling cattle or murder, then the two ranches will start a war against each other. In the meanwhile, Anthony's gang will round up all the cattle from the two ranches, change brands, and sell them at market. It's up to Hoppy, Red, Uncle Ben, and Johnny Nelson (who is a target for Meeker's hands since Johnny is sweet on Meeker's daughter Mary) to clear the Bar 20's name and round up the outlaws. The film is a very good entry in the opening film of the Hopalong series, but far from the best, since the action doesn't really begin past the halfway point of the film. Then on it's gets better building up to a great climax. Good performances by the cast (especially by Hayes as Uncle Ben, in a pre Windy Halliday role), but Thomson is miscast and ineffective as Anthony. Rating, based on B westerns, 6.