"Bizarro"
Triangle 1994-10.
Continued from Superman: The Man of Steel #31, continues in Adventures of Superman (1987) #510.
Like most of the other clones in Metropolis, Luthor's health is failing fast. Desperate for any kind of cure or treatment, Luthor and Happersen resurrect Doctor Teng's failed experiments to clone Superman in the hopes of finding some new information about the deterioration of clones. Failing again, they manage to create a new Bizarro who quickly escapes and begins causing chaos throughout the city.