Gabby Hayes is not yet the sidekick in Call of the Prairie, but he plays one of the heavies, Shanghai McHenry, while the future looks dim for junior sidekick Johnny Nelson (Jimmy Ellison). Johnny is framed by Shanghai's gang for the robbery and murder of the Bar-20 boss and, complicating the situation, falls in love with a beautiful girl who happens to be Shanghai's daughter! Can Hopalong Cassidy (William Boyd) save the day? Hopalong runs into crooked rancher Trumbull, who is trying to keep decent people from building a fence on their property in Heart of the West. Determined to drive his stolen cattle, the rancher locks horns with the Jordan family and sends a stolen stampede towards our heroes.
Western double-feature for all the family, including: CALL OF THE PRAIRIE: Hopalong Cassidy rescues Johnny and as they gallop away they discover a girl on a runaway horse. Johnny falls in love with the girl, which is very complicating because she is the daughter of Shanghai, one of the miscreants. They recapture Johnny and plan to kill both him and Shanghai. Also featuring HEART OF THE WEST: A crooked rancher is Hopalong's nemesis, trying to keep honest folk from building a fence on their ranch. The rancher sets a stolen herd of cattle onto our hero as he battles to save the day.