"The Final Days of Superman, Part 2: Dark Discovery"
Continued from Superman (2011) #51 and continues in Action Comics (2011) #51.
*In part two of "Super League," Superman enlists Batman's aid in seeking out people that can help form his new super-league. A shocking discovery is made about a new super-being no one knew existed, and something is beginning to stalk Superman... *Source: dccomics.com