All-Star Superman Vol 1 4

In issue #4, Superman must once again come to the rescue of Jimmy Olsen, who is running the P.R.O.J.E.C.T. as part of Jimmy's popular "For A Day" series. While exploring P.R.O.J.E.C.T. headquarters, his guide shows him the "Underverse," a newly-discovered layer of reality with extreme gravity fluctuations. However, the tables are turned when in the process of recovering P.R.O.J.E.C.T.'s equipment, a piece of Black Kryptonite is discovered (Black Kryptonite was previously unknown in All-Star Superman continuity). It turns Superman evil, and Jimmy must find a way to stop him before the P.R.O.J.E.C.T. is forced to use a Phantom Zone projector on him, ironically donated by Superman himself for just such an emergency; apparently, in the All-Star universe, it is not possible to retrieve criminals from the Phantom Zone. A major subplot throughout the issue is Jimmy's apparent struggle with a curse from "the Queen of the Gypsies" to suffer bad luck until the next full moon.