AllMovie

Released by Syndicate, a forerunner of sorts to Monogram Pictures, this Western serial stars veteran silent actor Robert Frazer as Jack Logan, the heir to half of a map to a hidden Indian mine. Evil French-accented trader Jean Gregg (Al Ferguson) sends his chief henchman Mack (Charles King) to make life difficult for Logan, who is aided in his quest by the heirs to the other half of the map, Helen (Blanche Mehaffey) and her kid brother Billy (Buzz Barton), and, most importantly, a uniformed mystery man known only as The Mystery Trooper. Produced by Harry S. Webb and one of Hollywood's few women executives, Flora E. Douglas, The Mystery Trooper has, somewhat unfairly, gone down in history as one of the worst serials made in the sound era. The surviving print is a 1938 reissue, retitled Trail of the Royal Mounted and complete with new, and more colorful, chapter titles.