Sally Eilers
— Irene Eaton a.k.a. Margaret Brennan
Allan Lane
— George Wolf / James Huntley
Fritz Leiber
— Dr. Krull
Frank M. Thomas
— Col. John Shaw
Theodore von Eltz
— Col. Marvin Page
Addison Richards
— Senator Everett Brock
Larry J. Blake
— Ben Dawson
Pierre Watkin
— Colonel Wilson
Louis Jean Heydt
— Gillian
Spencer Charters
— Lucius Wilkins
Leona Roberts
— Ella Wilkins
Charles Halton
— Beldon
Alec Craig
— Canby
Stanley Blystone
— Detective
Harry Joe Brown Jr.
— Young Boy
Hal Craig
— Motorcycle Policeman
Robert Fiske
— Davis
Bess Flowers
— Plane Crash Spectator
Christian J. Frank
— Henchman Tailing Irene
Bud Geary
— Policeman
Harrison Greene
— Man on Train Wanting 'Less Red Tape'
Roger Hunt
— Minor Role
Mike Lally
— Henchman
Harold Miller
— Bar Patron at Club Dome
Howard M. Mitchell
— Police Captain
Edmund Mortimer
— Man with Senator in the Dome Cafe
Pat O'Malley
— Intelligence Service Man
Grady Sutton
— Quiet Man on Train
Richard Tucker
— Colonel at Explosion
William Worthington
— Senator in the Dome Cafe