Not bad: Eisner's Atomic Bum is the earliest I can find. I don't see Herblock's character before 1949 ("reply hazy: ask later"), and Fearless Fosdick didn't fight his Atom Bum until 1952.
Additional Information
Name
The Spirit 1946-02-03 - Philadelphia Record | Published
Publication
Pages: 16
Comic Story
The End of the World / The Spirit (7 pages)
Genre
Adventure; Detective-mystery
Characters
Doctor Grotch; Spirit [Denny Colt]; Dolan; Ebony White
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