- Tom Tyler
- Captain Marvel
- Frank Coghlan Jr.
- Billy Batson
- William 'Billy' Benedict
- 'Whitey' Murphy
- Louise Currie
- Betty Wallace
- Robert Strange
- John Malcolm
- Harry Worth
- Prof. Luther Bentley
- Bryant Washburn
- Henry Carlyle [Ch. 1-3]
- John Davidson
- Tal Chotali
- George Pembroke
- Dr. Stephen Lang [Ch. 1-9]
- George Lynn
- Prof. Dwight Fisher [Ch. 1-6]
- Reed Hadley
- Rahman Bar [Ch. 1, 11-12]
- Jack Mulhall
- James Howell [Ch. 1]
- Kenne Duncan
- Barnett - Chief Henchman [Ch. 2-10]
- Nigel De Brulier
- Shazam [Ch. 1]
- John Bagni
- Cowan - Henchman [Ch. 2-10]
- Carleton Young
- Martin - Henchman [Ch. 3-9]
- Leyland Hodgson
- Maj. Rawley [Ch. 1]
- Stanley Price
- Owens - Henchman / Driver [Ch. 3-5]
- Ernest Sarracino
- Akbar [Ch. 11-12]
- Tetsu Komai
- Chan Lai [Ch. 4]
- Wilson Benge
- Benson - Lang's Butler [Ch. 8]
- Lynton Brent
- Lefty - Heavy at Lang's Estate [Ch. 8]
- Earle D. Bunn
- Dam Heavy 1 [Ch. 7]
- Ed Cassidy
- Dodge - Captain of 'The Carfax' [Ch. 10]
- Steve Clemente
- Native 5
- Armand Cortes
- Hamid - the Wise Man [Ch. 12]
- Victor Cox
- Henchman
- Dick Crockett
- Bridge Heavy [Ch. 2]
- Joe De La Cruz
- Native 6
- Eddie Dew
- Cavalry Lieutenant [Ch. 1]
- Curley Dresden
- Native 3 [Ch. 1]
- James Fawcett
- Curio Shop Henchman 2
- Art Felix
- Native
- Bud Geary
- Pete - Lang's Estate Caretaker [Ch. 8-9]
- Augie Gomez
- Native 2
- Ray Hanson
- Trucker
- Sam Harris
- British Col. Hudson [Ch. 1]
- Jerry Jerome
- Brandon - Airport Heavy [Ch. 3]
- Al Kikume
- Native Chief [Ch. 11]
- Marten Lamont
- British Radio Sergeant [Ch. 1]
- Paul Lopez
- Ali
- Stanley Mack
- Henchman at Fisher's House [Ch. 6]
- Ted Mapes
- First 'Carfax' Seaman [Ch. 10]
- Frank Marlowe
- Gus - Henchman [Ch. 8]
- Gerald Mohr
- Scorpion
- Chuck Morrison
- Carlson - First Mate on 'The Carfax' [Ch.10]
- Loren Riebe
- Curio Shop Heavy [Chs. 2-4]
- Francis Sayles
- Carter - Truck-Rental Heavy [Ch. 4-5]
- George Suzanne
- Dam Heavy 2 [Ch. 7]
- Al Taylor
- Native 3 [Ch. 1]
- Duke Taylor
- Lefty - Guillotine Heavy [Chs. 2-3]
- Ken Terrell
- Hawks - Bentley's Butler [Ch. 6]
- Frank Wayne
- Steve - Third Heavy at Lang's Estate [Chs. 9-10]
- Henry Wills
- Native 5
- Carl Zwolsman
- Army Sentry [Ch. 1]
