Harry Kallen

Sam Moreland

J. C. Grant

Dr. P.J. 'Phil' Winston

Kingsley Willis

Sen. Bentley

Mr. Henry Mercer

Major Bailey

Doctor Walter Morrison

Dr. Harvey Willard

Toomey

Jonas Overmire

Charles Gilbert

Col. Hans Adamson

Dr. Paul Renwick

Col. Merian 'Steve' Cooper

Inspector Huxley

Phil Carson

Dr. Cary Grayson

Cmdr. William B. 'Bill' Goggins

Self (segment 'Sergeant York') (archive footage)

John Davidson

District Attorney Stanley S. Harding

Maj. Mallory - Clark Field

Colonel Von Reichart

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

Mueller

Downs (uncredited)

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