- Paul Kelly
- 'Scoop' Hanlon
- Constance Moore
- Stephanie Kirkland
- William Lundigan
- Larry Dearden
- Edwin Stanley
- Dr. Carroll
- Selmer Jackson
- Frank Baldrich
- Billy Wayne
- 'Vic'
- George Cooper
- 'Jake'
- P.J. Kelly
- Edwards - the Butler
- Florence Wix
- Linda Baldrich
- Harlan Briggs
- Frank Kendall - Editor
- Pat C. Flick
- Inventor - Nikolaus Popoulos
- John Harmon
- Baldrich's Guard
- Guy Usher
- Police Inspector McDonald
- Thomas Carr
- Minor Role
- Myrtis Crinley
- Minor Role
- Billy Engle
- First inventor
- Allen Fox
- Minor Role
- George Ovey
- Gatekeeper
- Raymond Parker
- Wolf
- Michael Slade
- Brown - Kendall's Assistant
- Leonard Sues
- Office Boy
- Margo Yoder
- Maid
