If you’re at all superhero inclined you owe it to yourself to check out the Tales of the Sinestro Corps Superman-Prime special.
DC and Marvel are often slammed for having too much back story, too much continuity. Well here we have Geoff Johns tells the story of one of DC’s more complicated and continuity-thick characters is also one of the more tragic. It’s not just the story of Superboy-Prime’s decent but a pretty good summery of the various retcon’s DC’s done.
And he does it all in one issue.