Action Comics (1938-2011) #310

�SECRET OF KRYPTONITE SIX!� Jax-Ur convinces Superman release him from the Phantom Zone in order to save the people of Atlantis from a deadly plague. To do so, they will have to travel back to Krypton before its destruction! In �SUPERGIRL�S RIVAL PARENTS!� Supergirl finally manages to free her parents from the Survival Zone, where they have been trapped since the destruction of Argo City.