- Tom Brown
- Jack Martin
- Rose Hobart
- Fraulein Von Teufel
- Edgar Barrier
- Tommy Thompson
- Marjorie Lord
- Janet Thompson
- Keye Luke
- Capt. Wing
- Sidney Toler
- Gen. Kai Ling
- Cyril Delevanti
- Mah Ling / Han Po
- Philip Ahn
- Wu Tan
- Nigel De Brulier
- Lo San
- Turhan Bey
- Kageyama
- David Hoffman
- Blenker [Chs. 9-11]
- Edward Coch
- Hito
- Jay Novello
- Kushimi [Chs. 1-3, 12-13]
- Emil Alegata
- Capt. Wu [Ch. 1]
- Eddie Blumfield
- Police Officer [Chs. 11-12]
- Stanley Blystone
- Capt. Harrigan [Chs. 5-6]
- Paul Bryar
- Herr Bauer - German Spy [Chs. 6-7]
- Luke Chan
- Mandonese Gate Guard [Ch. 2]
- Spencer Chan
- Kushimi's Henchman [Chs. 12-13]
- Eddie Coke
- Naval Pilot
- Edward Colebrook
- Submarine Captain [Ch. 6]
- James Craven
- Commissioner Robert George Hardy [Chs. 5-7]
- Kernan Cripps
- Hong Kong Policeman [Ch. 5]
- Angelo Cruz
- Kushimi's Henchman-Radio Operator [Chs. 12-13]
- Grace Cunard
- Nazi Agent #2 [Chs. 6-7]
- Norma Drury
- Frau Bauer - Nazi Agent
- Paul Dubov
- Mandonese Man [Chs. 2-3]
- George Eldredge
- Detective-Guard [Ch. 5]
- William Forrest
- Secretary for Internal Affairs - Honolulu [Chs. 8-12]
- Jerry Frank
- Hawaiian Policeman [Ch. 9]
- Bert Freeman
- Shimoto [Chs. 10-11]
- Arno Frey
- Nazi Agent [Ch. 5]
- Hans Fuerberg
- German Sailor [Ch. 10]
- Michael Gaddis
- Native Guard
- Jack Gardner
- Capt. Yoshudo [Chs. 1-3]
- Frederick Giermann
- Schlesser [Chs. 10-11]
- Joe Gilbert
- Clerk
- Don Grusso
- Japanese Soldier
- Alex Havier
- Sanson [Chs. 6-7]
- Herbert Heyes
- Sir Cedric [Chs. 5-7]
- Tony Javier
- Chinese Man
- Edward Keane
- Hon. George Hill [Chs. 8-12]
- James Khan
- Rah Lal [Ch. 1]
- Tommy Lee
- Japanese Soldier
- Frank Marlowe
- Driver of Car 5
- Pat McKee
- Box Mover [Ch. 9]
- Moy Ming
- Villager
- Frank Mitchell
- Japanese Soldier
- Lee Murray
- Radio Operator
- Jack O'Shea
- Honolulu Police-Car Driver [Chs. 11-12]
- Wheeler Oakman
- Freighter Mate [Chs. 7-8]
- Edward Peil Sr.
- Freighter Captain [Chs. 7-8]
- Terrance Ray
- Shuma - Pilot [Chs. 1-3]
- Charles Regan
- Cop #4
- Jack Santos
- Japanese Stooge
- Charles Sherlock
- Nazi Agent Posing as Plainclothesman [Ch. 9]
- J. Scott Smart
- Japanese Colonel
- Ralph Soncuya
- First Radio Operator [Chs. 1-4, 12]
- Eleanor Soohoo
- Janet's Maidservant [Chs. 1, 4]
- Harry Strang
- Honolulu Police Detective [Chs. 10-12]
- Tom Ung
- Hawaiian
- Louis Vincenot
- Submarine Officer [Ch. 6]
- Phil Warren
- Policeman Joe [Chs. 10-12]
- Dave Wengren
- Freighter Helmsman [Chs. 7-8]
- Bruce Wong
- Asian
- Victor Wong
- Radio Operator in Hong Kong [Chs. 5-6]
- Victor Zimmerman
- Nazi Agent Posing as Guard [Ch. 5]
