Action 596 (Jan. 88) is a Millenium crossover (Week 4), by Byrne and Williams, but also a chapter in the Superman story arc running within the larger crossover. Superman had discovered that the people he grew up with in Smallville were all implanted and controlled by the Manhunters. The previous issue of Adventures of Superman ended with him defeating the Manhunter robot in charge, which left all the residents dead.
The Spectre is drawn to the scene. Something is not right about it, but he cannot see what is wrong.
He transports Superman to the astral plane, where they “see” the imagined Smallville of the people, newly dead but in denial. According to Spectre, not a rare thing, but never so large, or lasting so long.
In fact, the whole astral plane is a fake, all conjured by the supposedly dead Manhunter in some way that has never made sense to me, so I don’t think about it too much. It’s more fun to look at the page of him, under the Spectre’s control, ripping himself open.
There is also a great page of the Spectre scaring kids planning to pull a prank on Lana’s house.