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Name: Frank Martin
First Appearance: Superman (vol. 1) #8 (Jan.-Feb. 1941): "The Fifth Column"
Creators: Jerry Siegel, Wayne Boring, Don Komisarow
Number of Appearances: 1
Enemy of: Jeff Carlton, Nazi subversive army
Employer: U.S. anti-espionage service
Ally: Clark Kent
Occupation: intelligence agent
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