Superman: World of New Krypton #2

After Superman begins his duties as Commander in New Krypton's military and meets his unit, he visits with his aunt and his cousin Supergirl at a gala held by the artists guild. After some family time, Kal-El is called away by Zod, who orders him to subdue a herd of rampaging thought-beasts. After completing his mission, however, Superman discovers that a faction of the labor guild has taken hostages at the gala and that as a counter-measure Commander Gor has taken members of the labor guild as hostages of his own.