- Allan Lane
- Sergeant Dave King
- Robert Strange
- John Kettler
- Robert Kellard
- Tom Merritt, Jr.
- Lita Conway
- Linda Merritt
- Herbert Rawlinson
- Ross King [chs 1-4]
- Harry Cording
- Wade Garson
- Bryant Washburn
- Matt Crandall
- Budd Buster
- Vinegar Smith
- Stanley Andrews
- Tom Merritt Sr. [Ch. 1]
- John Davidson
- Shelton [Chs 4, 5]
- John Dilson
- Doctor Wall [Ch. 1]
- Paul McVey
- His Excellency [Ch. 1]
- Lucien Prival
- Admiral [Ch. 1]
- Norman Willis
- Tarner [Chs. 1,12]
- Tony Paton
- LeCouteau
- Walter Bacon
- Miner
- John Bagni
- Higgins, Cabin Henchman [Ch. 7]
- Earle D. Bunn
- Joe - Smelter Truck Driver [Chs. 8-9]
- Tommy Coats
- Henchman Mike
- Jack Deery
- Military Officer
- George DeNormand
- Fake Inspector Kent [Ch. 11]
- Curley Dresden
- Kelly - Miner [Chs. 1, 3]
- Douglas Evans
- Sergeant - Wireless Operator [Chs. 1, 11]
- James Fawcett
- Smelter Heavy #2 [Chs. 8-9]
- George Ford
- Paralytic #3 [Ch. 4]
- Bud Geary
- Klondike
- Alan Gregg
- Mills
- Sam Harris
- Major Harold Bolton [Ch. 11]
- Bob Jamison
- Pete
- Bruce Kellogg
- Const. MacCloud
- Walter Lowe
- Paralytic #2 [Ch. 4]
- Ted Mapes
- Blake - Gang Pilot [Chs. 2-4, 7, 9]
- Dave Marks
- Knife Heavy [Ch. 6]
- George Plues
- Train Brakeman [Ch. 5]
- Wallace Reid Jr.
- Constable Doyle [chs 2, 9, 12]
- Loren Riebe
- Fake Inspector Dinwoodie [Ch. 11]
- Dick Simmons
- Constable Carter
- Cy Slocum
- Sanitarium Heavy [Ch. 4]
- William Stahl
- Corporal Bob Hastings [Ch. 1]
- Denny Sullivan
- Paralytic #1 [Ch. 4]
- Al Taylor
- Henchman Red [Chs. 5-8, 10, 12]
- Duke Taylor
- Smelter Heavy #1 [Chs. 8-9]
- Ken Terrell
- Henchman Al [Chs. 1, 3-5]
- Charles Thomas
- Henchman Bayliss [Ch. 12]
- Al Thompson
- Paralytic #4 [Ch.4]
- Richard Travis
- Constable Hallett
- Dale Van Sickel
- Gang Radioman [Ch. 2]
- Frank Wayne
- Brant - Speedboat Driver-Thug [Chs. 1, 4. 9]
- Robert Wayne
- Lieutenant [Ch. 1]
- Bill Wilkus
- Bill - Sanitarium Heavy [Ch. 4]
