The Spirit is a fictional masked crimefighter created by cartoonist Will Eisner. He first appeared June 2, 1940, as the main feature of a 16-page, tabloid-sized, newsprint comic book insert distributed in the Sunday edition of Register and Tribune Syndicate newspapers; it was ultimately carried by 20 Sunday newspapers, with a combined circulation of five million copies during the 1940s. "The Spirit Section", as the insert was popularly known, continued until October 5, 1952. It generally included two other four-page strips (initially Mr. Mystic and Lady Luck), plus filler material. Eisner, the overall editor, wrote and drew most Spirit entries, with the uncredited assistance of his studio of assistants and collaborators, though with Eisner's singular vision a unifying factor.