Grant Morrison is having fun with this series and the dusty, forgotten characters from ancient DC issues too. The first half of the book has a group of superheroes called the United Planets Superwatch overmatched by a new gamma-radiation-spewing enemy, the Qwa-Man or Mad Lantern. This group is made up of one-appearance heroes mainly from Superman-related titles. (I only know this from reading it online.) United Planets is connected to the Legion of Super-Heroes in the 30th century. Qwa-Man appears to be unstoppable.
Meanwhile, Hal Jordan is having a fantasy heroic quest vacation on the planet Athmoora with a warrior woman and a demonic satyr as companions. They are up against a fearsome enemy who gradually becomes familiar to Hal. Without spoiling things, I’ll just say the two storylines connect at the end with more interesting characters from Grant’s imagination.
The writing, art, colors and letters are all top-notch in this series, and it’s a pleasure to read. Highly recommended, and this is a good jumping-on point.