Adventures of Superman (1986-2006) #504 (NOOK Comic with Zoom View)

The “Reign of the Supermen” continues from SUPERMAN (1987-2006) #81: Superman, Superboy and the Man of Steel storm Mongul's city despite the threatening levels of Kryptonite...levels so high that it could mean the end of Superboy! Continued in ACTION COMICS (1938-2011) #691.