Action Comics (Action Comics Vol. 3 #1074)

SUPERMAN BACK IN TIME?! GREAT RAO! A dying planet, a desperate scientist, a last son...it could only mean one thing: Krypton! To uncover the secrets of the Phantom Zone, Kal-El must journey back to the days of his birth planet and into the lab of Jor-El himself. What shocking secrets will link the greatest prison known to the cosmos and the nefarious villain Aeythr... and does the Man of Steel stand a chance of making it out alive?

Plus, Supergirl's mission halts as she finds herself captured and awaiting her fate at the hands of the highest bidder!