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.
Harry Donenfeld
In 1935, Major Malcolm Wheeler-Nicholson approached Independent News in a bid to relaunch his comic book "New Fun", having lost his previous backers due to poor sales and debts. Donenfeld accepted to distribute the comic but with heavy loss of rights to Wheeler-Nicholson. The major produced two more titles to be handled by Independent News, "New Comics" and "Detective Comics" (which would later see the first appearance of Batman), now under the banner of Detective Comics Inc., in which Wheeler-Nicholson was forced to take Donenfeld and Liebowitz as partners. In 1938, Donenfeld sued Wheeler-Nicholson for nonpayment and Detective Comics Inc. went into bankruptcy. Donenfeld then bought up the company and Wheeler-Nicholson's National Allied Publications in their entirety as part of the action.