This 13 chapter serial is based on the comic strip character Ace Drummond created by Eddie Rickenbacker. Ace is a 'G-Man of the sky' working out of Washington D.C. He is sent to Mongolia to find out why a mysterious villain known only as 'The Dragon' is trying to prevent the newly formed International Airways from setting up an airport there. Ace meets Peggy Trainor (Jean Rogers) who is searching for her archaeologist father who has disappeared. Together they search for answers to the puzzles.
| Actor | Role |
|---|---|
 John 'Dusty' KingAce Drummond | Ace Drummond |
 Jean RogersPeggy Trainor | Peggy Trainor |
 Noah Beery Jr.Jerry | Jerry |
| JJackie MorrowBilly Meredith | Billy Meredith |
 Chester GanKai-Chek | Kai-Chek |
 Guy Bates PostThe Grand Lama | The Grand Lama |
 Lon Chaney Jr.Henchman Ivan | Henchman Ivan |
 Selmer JacksonWilliam Meredith, Sr. | William Meredith, Sr. |
 Robert WarwickWinston | Winston |
 James B. LeongHenry Kee | Henry Kee |
 Arthur LoftChang-Ho | Chang-Ho |
| JJames EaglesJohnny Wong, Radio Operator | Johnny Wong, Radio Operator |
 C. Montague ShawDr. Trainor | Dr. Trainor |
 Frederick VogedingBauer | Bauer |
 Al BridgePaul Wyckoff | Paul Wyckoff |