Prior to the United States' involvement in World War II, the masked vigilante Spy Smasher fights Nazi agents operating within the US, led by the treacherous sabotage leader codenamed The Mask.

Kane Richmondas Alan Armstrong / Jack Armstrong
Marguerite Chapmanas Eve Corby
Sam Flintas Admiral Corby
Hans Schummas The Mask
Tristram Coffinas Drake
Franco Corsaroas Captain Pierre Durand
Georges Renaventas Governor LeComte
Rudolph Andersas Col. Von Kohr