It's the last pre-Crisis Superman story.

Crisis On Infinite Earths was a light reboot of the DC Universe; some characters' stories, like Batman and the Teen Titans, continued on as they were before the Crisis. But some characters had more dramatic re-inaginings. Superman was one of them. Brand new creative team, brand new origin. But that meant the Silver Age Superman, who'd been with audiences for decades, had to be erased from continuity.

Whatever Happened to the Man of Tomorrow is that ending, written by Alan Moore of Watchmen fame.

It's just two issues, but Superman, along with his main supporting cast of friends and family, his biggest villains, as well as the Legion of Super-Heroes, all get really poignant send-offs. I know a lot a folks say All-Star Superman is the best Superman story ever told, but I think there's a serious case to be made for this one.

Check it out!