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.
Superman (comic book)
Superman is an ongoing American comic book series featuring the DC Comics superhero Superman as its main protagonist. Superman began as one of several anthology features in the National Periodical Publications comic book "Action Comics" #1 in June 1938. The strip proved so popular that National launched Superman into his own self-titled comic book, the first for any superhero, premiering with the cover date Summer 1939. Between 1986 and 2006 it was retitled The Adventures of Superman while a new series used the title "Superman". In May 2006, it was returned to its original title and numbering. The title was canceled with issue #714 in 2011, and was relaunched with issue #1 the following month which ended its run in 2016. A fourth series was released with issue #1 in June 2016 and ended in April 2018. A fifth series with new issue #1 was launched in July 2018.