Harry Kallen
Dr. Sam Moreland
J. C. Grant
Dr. P.J. 'Phil' Winston
Kingsley Willis
Sen. Bentley
Mr. Henry Mercer
Major Bailey
Doctor Walter Morrison
Dr. Willard
Toomey
Jonas Overmire
Charles Gilbert
Col. Hans Adamson
Dr. Paul Renwick
Col. Merian 'Steve' Cooper
Huxley (as Stanley C. Ridges)
Phil Carson
Dr. Cary Grayson
Cmdr. William B. 'Bill' Goggins
John Davidson
District Attorney Stanley S. Harding
Maj. Mallory - Clark Field
Colonel Von Reichart
Himself (segment 'Sergeant York') (archive footage)
Hansen
Air Minister
Martin T. Fleming, Attorney
Professor Alexander Siletsky
Kenneth Hanline
Maj. Romulus Taipe
Major Buxton
District Attorney Tom F. Winton
Johnson
Prof. George Kingsley / Red Cannon
Doctor Frankton (as Stanley C. Ridges)
Hamilton Peyton
Charles 'Charlie' Garreth
Downs (uncredited)
Mueller
Gen. Casement
Earl Brennan / Dave Talbot
District Attorney
Tony Croy
Edward Norris
Rene de Montigny
Dr. John Pritchard
Dr. James Carroll
Dan Innes
MacKelvey
Shadow
Paul Decker
Eddie White
George
Gilbert Gordon