Following the startling events of NEW KRYPTON, Earth finds itself without Superman. Luckily, Metropolis still has heroes like Mon-El. But after years of knowing nothing but the solitude of the Phantom Zone, how will Mon-El acclimate himself to society? And the recently returned Guardian has his hands full with his new position in the Science Police. How can they fill Superman's shoes? Collecting SUPERMAN #684-690, ACTION COMICS #874 and elements from ACTION COMICS ANNUAL #10!