Action Comics #453

This November 1975 issue of Action Comics opens on a deeply unsettling image: a figure in Superman's costume peeling away his own face to reveal a sinister, grinning stranger beneath, while the unconscious body of Clark Kent lies crumpled in the background. The chilling cover caption — "Now that Clark Kent is out of the way — it's MY turn to be Superman!" — sets up a mystery of stolen identity that's hard to resist. Bob Oksner's cover art sells the threat with remarkable unease, and the issue also promises a backup story featuring the Atom.