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.
Action Comics
Following the events of "Crisis on Infinite Earths", writer/artist John Byrne relaunched the Superman franchise in "The Man of Steel" limited series in 1986. "Action Comics" became a team-up title with issue #584 (January 1987) featuring Superman and the New Teen Titans. Other costars during this period included the Phantom Stranger, the New Gods, the Demon, Hawkman, the Green Lantern Corps, the Metal Men, Superboy, Big Barda, Mister Miracle, Booster Gold, the Martian Manhunter, the Spectre, Lois Lane and Lana Lang, Checkmate, Wonder Woman, and Man-Bat. The first "Action Comics Annual" was published in 1987 and featured Superman teaming with Batman in a story written by Byrne and drawn by Arthur Adams. A DC Comics Bonus Book was included in issue #599 (April 1988).