Byrne and Giordano catch up with Superman in space in Action 589 (June 1987).
He is found, unconscious and just sort of floating there, by Arisia, who brings him back to the base the Green Lanterns are using at the moment.
Superman wakes up, still immersed in the plot of the previous issue, and it takes him a while to clue in that he is in a completely different story now. The Green Lantern Corps who appear in this story are the line-up from the current, ongoing series. Hal Jordan, John Stewart, Katma Tui, Arisia, Kilowog, Salaak and Ch’p are the only Green Lanterns left, with the central power battery in ruins, at this point in their history.
They are trying to find a new home for a species of intelligent worms, the last survivors of their planet.
They find a potential mass of unused dirt in space, the same dirt left by Superman a few issues earlier. It is still sort of “infected,” and causes some problems.
Superman adds his will power to that of the Lanterns, and together they transform the mass into a new home for the worms. Yay!