Adventures Of Superman #516

A Zero Hour crossover issue. With the events of Zero Hour unfolding, Superman finds himself transported to an alternate version of Metropolis . In this Metropolis, Lois Lane does not recognize Clark Kent, and the city is protected by Alpha Centurion . Superman teams up with Alpha Centurion to defeat the Centurion’s arch-enemy, Bloody Mary. Superman brings a wounded Alpha Centurion back to his headquarters, where he reveals his origin: he was a Roman captured by space aliens, learned their technology, then was returned to Earth thousands of years later. Using alien tech, Alpha Centurion became the greatest hero of his world.