Batman
The first Batman story, "The Case of the Chemical Syndicate", was published in "Detective Comics" #27 (May 1939). Finger said, "Batman was originally written in the style of the pulps", and this influence was evident with Batman showing little remorse over killing or maiming criminals. Batman proved a hit character, and he received his own solo title in 1940 while continuing to star in "Detective Comics". By that time, Detective Comics was the top-selling and most influential publisher in the industry; Batman and the company's other major hero, Superman, were the cornerstones of the company's success. The two characters were featured side-by-side as the stars of "World's Finest Comics", which was originally titled "World's Best Comics" when it debuted in fall 1940. Creators including Jerry Robinson and Dick Sprang also worked on the strips during this period.
Batman: Year One
DC released a hardcover "deluxe edition" of "Batman: Year One" () to coincide with the release of "Batman Begins" in April 2005. This release includes introductions by Miller and Mazzucchelli, the original penciled artwork, promotional and unseen Batman art, Lewis's color samples, and some pages of the original script, for a total of 144 pages. This edition was rereleased as a 136-page trade paperback in January 2007, with an introduction by O'Neil (). New versions of this edition were released in 2012 and 2017 ().