Action Comics #1 Published

Action Comics #1 (June 1938) is the first issue of the comic book series Action Comics. It features the first appearance of several comic book heroes—most notably the Jerry Siegel and Joe Shuster creation, Superman. For this reason it is widely considered both the beginning of the superhero genre and the most valuable comic book of all time.

Published on April 18, 1938 (cover-dated June), by National Allied Publications, a corporate predecessor of DC Comics, it is considered the first true superhero comic; and though today Action Comics is a monthly title devoted to Superman, it began, like many early comics, as an anthology.

http://en.wikipedia.org/wiki/Action_Comics_1
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