This combo made from images provided by DC Entertainment show covers of the publisher's zero issues of, from left, "Batman," "Aquaman," and "The Flash." In September, DC Entertainment will publish a zero issue for its 52 titles, a move that co-publishers Jim Lee and Dan DiDio said this week will help explain the origins and effects of its rebooted characters a year after it erased decades of history and continuity to start everything from scratch. (AP Photo/DC Entertainment)