Stanley Ridges

as Harry Kallen

as Sam Moreland

as Kingsley Willis

as Sen. Bentley

as Major Bailey

as Doctor Walter Morrison

as Dr. Harvey Willard

as Jonas Overmire

as Col. Merian 'Steve' Cooper

as Inspector Huxley

as Dr. Cary Grayson

as Cmdr. William B. 'Bill' Goggins

as John Davidson

as Maj. Mallory - Clark Field

as Colonel Von Reichart

as Hansen

as Martin T. Fleming, Attorney

as Professor Alexander Siletsky

as Kenneth Hanline

as Maj. Romulus Taipe

as Major Buxton

as Johnson

as Prof. George Kingsley / Red Cannon

as Doctor Frankton (as Stanley C. Ridges)

as Hamilton Peyton

as Charles 'Charlie' Garreth

as Mueller

as Gen. Casement

as District Attorney

as Edward Norris

as Rene de Montigny

as Dr. John Pritchard

as Dan Innes

as Shadow

as Paul Decker

as Eddie White