"Truth and Consequences"
Triangle 1992-43. Continued from Superman (1987) #73 and continues in Action Comics (1938) #683.
While conducting research in the Daily Planet microfilm library Clark comes across a twenty year-old headline proclaiming Mr. Mxyzptlk as the winner of a presidential election. Upon returning to the bullpen he sees that everybody is dressed like the magical imp and worships him like a celebrity.
As Lex Luthor tricked Mxyzptlk with a lie during his last visit to Earth, Mxy has decided to practice the art of lying during his new visit but leaves only Lex and Superman's memories of a normal world intact. Together Luthor and the Man of Steel must find a way to convince Mxyzptlk to change reality back to normal and return to the 5th dimension.
Elsewhere, the cracks that Doomsday managed to create in the walls of his tomb have now grown to small holes.
This issue contains a two page homage to Watchmen #1 depicting the squalid life Luthor lives in his old body under Mxyzptlk's altered reality.