- Kirk Alyn
- Blackhawk
- Carol Forman
- Laska
- John Crawford
- Chuck
- Michael Fox
- Mr. Case
- Don C. Harvey
- Olaf
- Rick Vallin
- Stan / Boris
- Larry Stewart
- Andre
- Weaver Levy
- Chop Chop
- Zon Murray
- Bork
- Nick Stuart
- Cress
- Marshall Reed
- Aller
- Pierce Lyden
- Dyke
- William Fawcett
- Dr. Rolph [Chs. 4-7]
- Rory Mallinson
- Hodge [Chs. 11-14]
- Frank Ellis
- Hendrickson [Chs. 1-2, 4, 8-9]
- Marshall Bradford
- Malcolm Smith - Chemist [Ch. 10]
- Jack Chefe
- Storage Plant Guard [Ch. 2] / Borrego's Servant [Ch.12] (uncredited)
- George Douglas
- Police Chief Valdez [Ch. 11]
- Eddie Foster
- Jose - Henchman-Guitarist [Chs. 11-14]
- Terry Frost
- The Leader's Secretary [Chs. 1-3, 6, 8,, 15]
- Frank Gerstle
- Dawson - New Fuel Demonstrator [Chs. 7-8]
- Charles Horvath
- Otto Helger - Seaman [Chs. 12-13]
- Knox Manning
- Narrator
- Alex Montoya
- Diego - Border Guard [Ch. 14]
- Jack Mulhall
- Defense Council Member [Chs. 7-8]
- Frank O'Connor
- Defense Council Member [Chs. 7-8]
- Hugh Prosser
- Colonel
- David Sharpe
- Henchman [Chs. 7, 15] / Mexican Motor Cop [Ch. 14] (uncredited)
- Wally West
- Henchman [Chs. 7-8]
- Frank Yaconelli
- Mexican Driver [Ch. 11]
