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).
Action Comics 1
"Action Comics" #1 (cover dated June 1938) is the first issue of the original run of the comic book/magazine series "Action Comics". It features the first appearance of several comic book heroes—most notably the Jerry Siegel and Joe Shuster creation, Superman—and sold for 10 cents (). It is widely considered to be both the beginning of the superhero genre and the most valuable comic book in the world. "Action Comics" would go on to run for 904 numbered issues (plus additional out-of-sequence special issues) before it restarted its numbering in the fall of 2011. It returned to its original numbering with issue #957, published on June 8, 2016 (cover-dated August).