With Wild Horse Round-Up, cowboy star Kermit Maynard put his "Canadian Mountie" film series behind him to concentrate on orthodox western action. Maynard plays Jack Benson, who gallops to the aid of heroine Ruth Williams (Betty Lloyd). She cold-shoulders him, assuming that he's but one of the many villains who's been trying to force her off her property. But Jack proves his noble intent by rounding up the bad guys just in time for the railroad to make a generous offer for Ruth's spread. Wild Horse Round-Up affords Kermit Maynard ample opportunity for the spectacular riding stunts which made him famous.