Superman: The Coming of the Supermen #2

Synopsis

Another attack by Kalibak, this time accompanied by Steppenwolf, brings Superman face-to-face with the "Supermen," who are actually Kandorians. After the fight, while having their wounds treated, Superman realizes Luthor is collecting their Kryptonian blood and also that the Apokoliptian attack was actually a diversion for stealing a red sun mote from Luthor. But before Superman can respond to that information, Kalibak crashes through on his way home to Apokolips, with a hostage in tow.