Adventures of Superman: Book of El (Adventures of Superman: Book of El #9)

THE FUTURE OF THE PHANTOM ZONE! After a face-off with Pyrrhos, Superman has won the support of the Fourth World, but it's not going to be enough. As Kryl-Ux grows more powerful, he also grows less human, and Osul's time is running out. Superman needs one more ally who's been hidden in the Phantom Zone: the matriarch of the House of El, Kara Zor-El.