- Jackie Cooper
- Bruce Scott
- Vondell Darr
- Mary Scanlon
- Edwin Stanley
- Pat Scanlon
- William Ruhl
- G- Man Hal Marvin
- Bill Cody Jr.
- 'Skeets' Scanlon
- David Durand
- 'Rip' Dawson
- Ralph Dunn
- Henchman Pug O'Toole
- Frank Coghlan Jr.
- Ken - a Boy Scout
- Ivan Miller
- Turk Mortensen
- Victor Adams
- Henchman Hurst
- Jason Robards Sr.
- Henchman 'Doc'
- Sidney Miller
- Hermie - a Boy Scout
- Dick Botiller
- Leeka - Leader of Warriors
- George Regas
- Lokola -Indian Tribe High Priest
- Jack Mulhall
- Scoutmaster Hale [Ch. 1]
- Edwin Brian
- Boy Scout
- Emmett Vogan
- G-Man Ed Billings [Chs. 1-2]
- Sam Bernard
- G-Man Blaine [Chs. 11-12]
- Lee Phelps
- G-Man Jim Carson [Chs. 11-12]
- Ed Brady
- Henchman Slade [Ch. 12]
- Bill Cartledge
- Rip's Gang Member [Chs. 1, 12]
- Iron Eyes Cody
- Indian
- Jim Hussey
- Boy Scout
- Lucien Maxell
- Indian Boy
- David McKim
- Boy Scout
- Eddie Parker
- Joe, Message Rider
- Franklin D. Roosevelt
- Self
- Tom Steele
- Runaway Surrey Driver [Ch. 1]
- Max Wagner
- Joe - Truck Driver-Henchman [Ch. 3]
