Spy Smasher is a 12-episode 1942 Republic serial film based on the Fawcett Comics character Spy Smasher which is now a part of DC Comics. It was the 25th of the 66 serials produced by Republic. The serial was directed by William Witney with Kane Richmond and Marguerite Chapman as the leads. The serial was Chapman's big break into a career in film and television. Spy Smasher is a highly regarded serial. In 1966, a television film was made from the serial footage under the title Spy Smasher Returns.

Plot

Alan Armstrong (Kane Richmond) as the Spy Smasher is a costumed vigilante and freelance agent, not associated with the US government as the country has not yet joined its allies in World War II. After discovering information about Nazi activities in occupied France, he is captured and ordered to be executed, but with the help of Pierre Durand (Franco Corsaro), he escapes back to the United States, meeting with his twin brother Jack (Kane Richmond). Jack is incorrectly recognized and attacked by a Nazi agent on American soil. The agent works for a sabotage leader codenamed The Mask (Hans Schumm), who operates a U-boat near the coast. Eve Corby (Marguerite Chapman) plays Jack's fiancé.