'Smilin' Jack' Martin
Janet Thompson
Trudy Muller, aka Fraulein von Teufel
Captain Wing
Tommy Thompson
Mah Ling / Han Po, his double
Wu Tan
Kageyama [Chs. 1-5, 12-13]
General Kai Ling [Chs. 1-5, 13]
Kushimi, infiltrator [Chs. 1-3, 12-13]
Henchman Hito [Chs 1, 4, 12-13]
The Lo-San [Chs. 2-3, 12-13]
Hon. George Hill [Chs. 8-12]
Secretary of Internal Affairs [Chs. 8-12]
Captain Yoshido [Chs. 1-3]
Shuma, pilot [Chs. 1-3]
Capt. Hardigan [Chs. 5-6]
Sir Cedric [Chs. 5-7]
Commissioner Robert George Hardy [Chs. 5-7]
Sanson, phoney waiter [Chs. 6-7]
Herr Bauer [Chs. 6-7]
Frau Bauer [Chs. 6-7]
Second German Woman Spy [Chs. 6-7]
John O. Blenker [Chs. 9-11]
Freighter Captain [Chs. 7-8]
Freighter Mate [Chs. 7-8]
Schlesser, device expert [Chs. 10-11]
Shimoto, device operator [Chs. 10-11]
Honolulu Detective-in-charge [Chs. 10-12]