One of my favorite Superman Stories, Action Comics #300, I was reading it last night: Superman travels a million years into Earth’s future to find that our yellow sun is now a red giant, rendering him powerless and trapping him in the depopulated ruins of the civilized world. He ends up traveling the scorched landscape in the company of a Perry White robot, walking across the dessicated ocean floor to his Fortress and narrowly evading death at the hands of weirdly mutated wildlife. The ending literally makes no sense (they introduce red kryptonite and forget to use it or that it wouldn’t work on Superman), but the final panel - involving a deeply troubled Superman glumly pondering the mortality of the world while resting by the edge of the Metropolis piers - is just terrific. A supremely grim and weird story, I’d happily include it in any Greatest Stories Ever Told collection …
PS: Uncredited, but either written by Jerry Siegel or Otto Binder, is my guess.
