Superman: The Man of Tomorrow (1995-1999) #8

A villain called Carbide is running rampant through Metropolis. His unique and strange abilities, coupled with his rock-hard exterior, make him a formidable foe for the Man of Steel. But that's only the beginning! A new underground criminal element is being born in the city and Carbide just might be its mightiest member. It's a true test of Superman's newly recovered strength as he faces his latest challenge!