All-star Superman

"The Underverse ruled by Bizarros. The time-eating Chronovore. Jimmy Olsen, superhero? Nothing is impossible in All-star Superman. Except for the fact that Superman... is dying. . . Time running against the Man of Steel. After a diabolical plot by his arch-foe Lex Luthor puts him on the brink of death, Superman must tie up loose ends and make sure that he leaves the Earth better than he found it"--Provided by publisher.