- Jack Mulhall
- 'Burn-'em-Up' Barnes
- Frankie Darro
- Bobbie Riley
- Lola Lane
- Marjorie Temple
- Julian Rivero
- Tony
- Edwin Maxwell
- Lyman Warren
- Jason Robards Sr.
- John Drummond
- Francis McDonald
- Ray Ridpath - Henchman [Chs. 1-6]
- Billy Bletcher
- Race Commentator [Ch. 1]
- Stanley Blystone
- Henchman Joe Stevens [Chs. 3-12]
- Lynton Brent
- Office Henchman Thompson [Chs. 10-12]
- Al Bridge
- Henchman Tucker [Chs. 3-12]
- Don Brodie
- Race Car DriverJones [Ch. 1]
- James P. Burtis
- Eddie - Film Assistant [Chs. 8-11]
- James Bush
- George Riley [Ch. 1]
- Horace B. Carpenter
- Irate Customer [Ch. 6]
- Jack Cheatham
- Policeman [Chs. 6-7]
- Richard Cramer
- Detective
- John Davidson
- Tom Chase - Race Car Henchman [Chs. 1-2, 5]
- Gordon De Main
- Tom - Car Owner [Ch. 1]
- Henry Hall
- Accident Witness [Ch. 1, 4. 5]
- Edward Hearn
- Henchman Parker [Chs. 2-5]
- Dickie Jones
- Schoolboy [Chs. 1, 7]
- Bob Kortman
- Henchman Frazer [Chs. 5-12]
- Tom London
- Parsons - Oil Speculator [Chs. 10-12]
- J. Farrell MacDonald
- Train Engineer [Chs. 7-8]
- Lew Meehan
- Ed - Truck Thug [Chs. 1-2] / Mike, Cop [Ch. 7] (uncredited)
- Bruce Mitchell
- Lambert - Film Director [Chs. 8, 10-11]
- Dennis Moore
- Crewman
- Eddie Parker
- Newsreel Cameraman [Ch. 1]
- Peter Potter
- Cameraman
- Dick Rush
- Detective [Ch. 5, 10]
- Harry Strang
- Eddie's Driver [Ch. 10]
- Arthur Thalasso
- Detective [Ch. 5, 10]
- Monte Vandergrift
- Race Car Owner [Ch. 1]
- Lloyd Whitlock
- Dist. Atty. Matthews [Chs. 5, 10, 12]
- Roger Williams
- Harry
