- Bruce Edwards
- Steve Colt
- Virginia Lee
- Joyce Winters
- Carol Forman
- Sombra
- Anthony Warde
- Ward, chief henchman
- Ramsay Ames
- Ruth Dayton
- I. Stanford Jolley
- Dr. Z.V. Jaffa
- Virginia Carroll
- Dr. Ann Curry
- Theodore Gottlieb
- Hitomu
- Gene Roth
- Editor J.M. Walker
- Sam Flint
- Dr. Henry Weston
- Tom Steele
- Bard
- LeRoy Mason
- Gang Chemist
- Forrest Taylor
- Bradley
- Ernie Adams
- Blinky- Street Photographer
- Keith Richards
- Agent Michael Burns
- Robert Barron
- Henchman Link
- Dick Gordon
- Demonstration Reporter
- Harold Landon
- Andy Baldwin - Pilot
- Carey Loftin
- Thug in Crate
- Gil Perkins
- Linseed Oil Drums Thug
- John Phillips
- Prosecuting Attorney
- Stanley Price
- Filmore Hagen
- Larry Steers
- Hospital Doctor
- Robert J. Wilke
- Cab Driver / Jailer (archive footage) (uncredited)
- Bud Wolfe
- Hangar Security Officer
