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