Characters played by Billy Halop
Billy 'Ace' Holden
Characters played by Gene Reynolds
Eddie Holden
Characters played by Lionel Atwill
The Baron
Characters played by Frank Albertson
Jerry Markham
Characters played by Richard Lane
Agent Don Ames
Characters played by Huntz Hall
'Bolts' Larson
Characters played by Gabriel Dell
'Stick' Munsey
Characters played by Bernard Punsly
'Greaseball' Plunkett
Characters played by Frankie Darro
Jack
Characters played by David Gorcey
Double Face Gordon
Characters played by Turhan Bey
Araka - Henchman
Characters played by John Bleifer
Beal - Henchman
Characters played by Eddie Foster
Comora - Henchman
Characters played by John Bagni
Augar - Henchman
Characters played by Noel Cravat
Monk - Henchman
Characters played by Paul Phillips
Agent Dick Parsons
Characters played by Kathryn Adams
Grace - Bolt's Girl [Chs. 1
7]
Characters played by William 'Billy' Benedict
Whitey [Ch. 11]
Characters played by Lynton Brent
Sergeant [Chs. 11-12]
Characters played by Paul Bryar
Chemist [Ch. 5]
Characters played by Frederick Burton
Col. Mitchell [Chs. 11-12]
Characters played by Edward Colebrook
Vamalka
Characters played by Angelo Cruz
Ito [Ch. 3]
Characters played by Rico De Montez
Japanese Clerk [Chs. 5
7-8]
Characters played by William Desmond
Parts Customer [Ch. 1]
Characters played by Heenan Elliott
Construction Site Watchman [Ch. 6]
Characters played by Bert Foreman
Scientist [Ch. 4]
Characters played by Vinton Hayworth
Berry Evans - Millionaire Flyer [Ch. 2]
Characters played by Bill Hunter
Policeman
Characters played by Frank Kelly
Soldier [Chs. 11-12]
Characters played by Guy Kingsford
Soldier-Driver [Chs. 11-12]
Characters played by Ken Lundy
Newsboy [Ch. 8]
Characters played by Charles Lung
Gobi
Characters played by Charles McAvoy
Policeman
Characters played by Roland Morris
Customer
Characters played by William Moss
Policeman
Characters played by Jay Novello
Dogara - Farm Gate Guard
Characters played by Jimmy O'Gatty
Alien Agent
Characters played by Pat O'Malley
Train Conductor [Ch. 3]
Characters played by Hugh Prosser
Army Lieutenant [Ch. 12]
Characters played by Joey Ray
Citizen
Characters played by Mel Ruick
Air Race Official [Ch. 1-2]
Characters played by George Sherwood
Instructor [Ch. 1]
Characters played by Dirk Thane
Policeman
Characters played by Guy Usher
Senator [Ch. 12]
Characters played by Frankie Van
Street Brawler [Ch. 1]
Characters played by Eddy Waller
Jed Holden [Chs. 1
3
5-6]
Characters played by Dan White
Spectator
Characters played by Wen Wright
Soldier [Chs. 11-12]