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!