- Charles Quigley
- Gene Townley
- Bruce Bennett
- Tiny Dawson
- David Sharpe
- Bert Knowles
- Carole Landis
- Blanche Granville
- Miles Mander
- Horace Granville
- Charles Middleton
- 39013 - Harry Crowel
- C. Montague Shaw
- Dr. Malcolm
- Ben Taggart
- Dixon
- William Pagan
- Police Chief Landon [Ch. 1]
- Corbet Morris
- Klein [Ch. 5]
- Raymond Bailey
- Stanley - Secretary [Chs. 1-3, 11]
- Fred 'Snowflake' Toones
- Snowflake
- George Chesebro
- Sheffield [Chs. 1, 11]
- Ray Miller
- Jeff
- Robert Winkler
- Sammy Townley [Chs. 1, 11]
- Tuffy
- Tuffie
- Harry Anderson
- Ward
- Earl Askam
- Lutens
- Roy Barcroft
- Mine Superintendent
- Reginald Barlow
- Doctor in Hospital [Ch. 1]
- Roy Brent
- Bill
- Buel Bryant
- Clinic Thug
- Earle D. Bunn
- Derrick Thug [Ch. 1-2]
- Forest Burns
- Mac - Gas Plant Heavy [Ch. 4]
- Yakima Canutt
- G-Man
- Jack Chapin
- Joe - Gas Plant Heavy [Ch. 4]
- Eddie Cherkose
- Burton
- Edmund Cobb
- Oil Field Foreman
- George DeNormand
- G-Man
- Forrest Dillon
- Kid
- Dee Dodd
- Kid
- Curley Dresden
- Powerhouse
- James Fawcett
- Man
- Eddie Foster
- Zeke
- Art Fowler
- Sloan
- Jerry Frank
- Dognapper
- Lee Frederick
- Bob
- Bud Geary
- Mine Thug at Phone
- Oscar 'Dutch' Hendrian
- Tank Heavy [Ch. 1]
- Earle Hodgins
- Hinkle - Barker [Ch. 1]
- Reed Howes
- Derrick Thug
- Michael Jeffers
- G-Man
- Jerry Jerome
- Marco [Ch. 1-2]
- Jack Kenney
- Steve
- Raymond Largay
- Police Commissioner [Ch. 1]
- Bert LeBaron
- Blake [Ch. 1-2]
- Ted Mapes
- Man
- Trudy Marson
- Nurse Benson
- Max Marx
- Tank Heavy [Ch. 1]
- Millard McGowan
- Man
- Joe McGuinn
- Ed
- Walter Merrill
- Pete #2
- John Merton
- Davis - Gas Plant Heavy [Ch. 4]
- Howard M. Mitchell
- Police Dispatcher [Ch. 1]
- Monte Montague
- Tom
- Jack Montgomery
- Gang Member
- Norman Nesbitt
- Newscaster
- Bill Nestell
- Pipeline Thug
- Broderick O'Farrell
- D. A. Graves
- Eddie Parker
- Pete - Derrick Heavy [Ch. 1-2]
- George Plues
- Ted - Gas Plant Heavy [Ch. 4]
- Stanley Price
- Prof. Selden
- Loren Riebe
- Derrick Thug [Ch. 1-2]
- Robert Robinson
- Al - Chemist [Ch. 4]
- Fred Schaefer
- Oil Thug
- Dick Scott
- Powerhouse Thug
- Cy Slocum
- Power Thug
- Harry Strang
- Peck [Ch. 4]
- Bernard Suss
- Dr. Black
- Al Taylor
- Al [Ch. 1]
- Duke Taylor
- G-Man
- Ken Terrell
- Gas Plant Thug
- Bob Thom
- Powerhouse Thug
- Charles Thomas
- Sam
- George Turner
- Oil Thug
- Sailor Vincent
- Miner
- Frank Wayne
- Dan
- Dave Wengren
- Miner
- Wally West
- Thug at Selden's Lab
- Lloyd Whitlock
- Doctor
- Robert J. Wilke
- G-Man
- Bill Wilkus
- Office Thug [Ch. 1] / Gas Plant Thug (uncredited)
- Bud Wolfe
- Dognapper-Driver
- Joe Yrigoyen
- Power Thug
