Kane Richmond
— Alan Armstrong / Spy Smasher / Jack Armstrong
Marguerite Chapman
— Eve Corby
Sam Flint
— Admiral Corby
Hans Schumm
— The Mask
Franco Corso
— Capt. Pierre Durand
Hans von Morhart
— Capt. Gerhardt
Georges Renavent
— Gov. LeConte
Rudolph Anders
— Col. Von Kahr
Henry Zynda
— Ritter Lazar
Paul Bryar
— Lawlor
Tom London
— Crane
Richard Bond
— Hayes
Crane Whitley
— Dr. Hauser
John James
— Steve
Frank Alten
— Storm Trooper Captain (uncredited)
Dudley Dickerson
— Train Porter (uncredited)
Yakima Canutt
— Armored Car Driver (uncredited)
William Forrest
— Gerald Douglas (uncredited)
Arvon Dale
— Thornton (uncredited)