In this issue, Flex Mentallo, Lt. Harry, the Hoaxer, and a mysterious moon-faced villain converge at the Legion of Legion headquarters where they learn the truth behind it all. A long time ago, there was an Earth with fantastic costumed superheroes. "The Absolute" threatened all reality, and the superheroes hatched a desperate last ditch plan. They bypassed the death of their reality by becoming fiction in our reality. They lived on, in a sense, as comic book characters. The "villain" of the piece turns out to be a teenaged Wallace Sage, repressing the heroes in his subconscious. Once he accepts the hero within himself, a trigger is activated that brings the lost heroes into our world, heralding a glorious new age.
The big showdown, with a side of metacommentary.
And, without further comment, the last four pages:
Grant Morrison and Frank Quitely did some great work here, and it should be available. Until then, this series provides a glimpse at their work.