JLA: Incarnations (2001-) #2

"BELONGING." When the fledgling Justice League of America finally hits its stride, other great heroes finally begin to consider joining the ranks of the World's Greatest Super-Team. Neither Batman nor Superman has ever been on a team before this moment in history—yet when one joins, the other does not. In the face of great hardship, why does Batman step into the limelight, while Superman stays away? The answer will astound you!