ACTION COMICS #839

Part 6 of the 8-part "Up, Up, and Away!" While Superman goes all-out to clean up the plague of villains overrunning Metropolis, Lex Luthor finally strikes with a devastating attack that could literally tear the city apart! And as Lex unleashes an engine of destruction from the center of the Earth, lost secrets of Krypton are revealed, the Daily Planet faces a huge story without its top reporter, and three unexpected words mark a turning point for Lois and Clark!