Detective Comics
Detective Comics is an American comic book series published by DC Comics. The first volume, published from 1937 to 2011 (and later continued in 2016), is best known for introducing the superhero Batman in "Detective Comics" #27 (cover dated May 1939).
1940s in comics
Batman #1, Cover dated Spring, 1940 introduced The Joker and Catwoman known simply as "The Cat". Created by Bob Kane and Bill Finger