Tom Brown
Role: 'Smilin' Jack' Martin
Marjorie Lord
Role: Janet Thompson
Rose Hobart
Role: Trudy Muller, aka Fraulein von Teufel
Keye Luke
Role: Captain Wing
Edgar Barrier
Role: Tommy Thompson
Cyril Delevanti
Role: Mah Ling / Han Po, his double
Turhan Bey
Role: Kageyama [Chs. 1-5, 12-13]
Sidney Toler
Role: General Kai Ling [Chs. 1-5, 13]
Jay Novello
Role: Kushimi, infiltrator [Chs. 1-3, 12-13]
Rico De Montez
Role: Henchman Hito [Chs 1, 4, 12-13]
Nigel De Brulier
Role: The Lo-San [Chs. 2-3, 12-13]
Edward Keane
Role: Hon. George Hill [Chs. 8-12]
William Forrest
Role: Secretary of Internal Affairs [Chs. 8-12]
Jack Gardner
Role: Captain Yoshido [Chs. 1-3]
Terry Grey
Role: Shuma, pilot [Chs. 1-3]
Stanley Blystone
Role: Capt. Hardigan [Chs. 5-6]
Herbert Heyes
Role: Sir Cedric [Chs. 5-7]
James Craven
Role: Commissioner Robert George Hardy [Chs. 5-7]
Alex Havier
Role: Sanson, phoney waiter [Chs. 6-7]
Paul Bryar
Role: Herr Bauer [Chs. 6-7]
Norma Drury
Role: Frau Bauer [Chs. 6-7]
Grace Cunard
Role: Second German Woman Spy [Chs. 6-7]
David Hoffman
Role: John O. Blenker [Chs. 9-11]
Edward Peil Sr.
Role: Freighter Captain [Chs. 7-8]
Wheeler Oakman
Role: Freighter Mate [Chs. 7-8]
Frederick Giermann
Role: Schlesser, device expert [Chs. 10-11]
Bert Freeman
Role: Shimoto, device operator [Chs. 10-11]
Harry Strang
Role: Honolulu Detective-in-charge [Chs. 10-12]
