"On the Edge"
Continued from Superman: The Man of Steel #27, continues in Adventures of Superman (1987) #506.
Luthor travels to Engine City under the guise of a mission to rescue it from falling into the Pacific ocean and contaminating the waters of Earth, but his real reason is to find either the Kryptonite that powered the behemoth or a way to synthesize the deadly radioactive material. Upon arrival Luthor finds that most members of the Justice League have already assembled there to deal with the remains of Engine City.
Back in Metropolis, Clark has decided to take Jimmy up on his offer for a place to live until he can find an apartment of his own - looks like the party is just getting started!