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.
John 'Dusty' King
as Ace Drummond
Jean Rogers
as Peggy Trainor
Noah Beery Jr.
as Jerry
Jackie Morrow
as Billy Meredith
Chester Gan
as Kai-Chek
Guy Bates Post
as The Grand Lama
Lon Chaney Jr.
as Henchman Ivan
Selmer Jackson
as William Meredith, Sr.
Robert Warwick
as Winston
James B. Leong
as Henry Kee
Arthur Loft
as Chang-Ho
James Eagles
as Johnny Wong, Radio Operator
