- Ray Corrigan
- Crash Corrigan
- Lois Wilde
- Diana Compton
- Monte Blue
- Unga Khan
- William Farnum
- Sharad
- Boothe Howard
- Ditmar
- Raymond Hatton
- Gasspon
- C. Montague Shaw
- Norton
- Lee Van Atta
- Billy Norton
- Smiley Burnette
- Briny Deep
- Frankie Marvin
- Salty
- Lon Chaney Jr.
- Hakur
- Lane Chandler
- Darius
- Jack Mulhall
- Andrews [Chs. 1, 12]
- John Bradford
- Joe [Ch. 1]
- Malcolm McGregor
- Zogg
- Ralph Holmes
- Martos
- John Merton
- Moloch
- Ernie Smith
- Gourk
- Lloyd Whitlock
- Clinton [Chs. 1, 12]
- Alan Curtis
- Guardsman
- George DeNormand
- Guardsman
- Franklyn Farnum
- Atlantis Official
- John David Horsley
- Navy Sentry
- Jack Ingram
- Khan's Guardsman
- Everett Kibbons
- Anthony
- Kenneth Lawton
- Navy Doctor
- Tracy Layne
- Guardsman
- Millard McGowan
- Chamber Guard
- Eddie Parker
- Khan's Guardsman
- Don Rowan
- Guardsman
- Charles Schaeffer
- Magna
- Cy Schindell
- Khan's Guardsman
- William Stahl
- Chamber Guard
- Tom Steele
- Guardsman
- Wes Warner
- Guardsman
- Bill Yrigoyen
- Charioteer
