Source: Superman vol.2 #41 to Action Comics #652 (1990)
Type: TransformationIt's often been said (and will again) that in the Silver Age, Superman was Kal-El first, and Clark Kent last. Superman was always pining for Krypton, visiting it through time travel or dreams or recreating it with awesome powers as a memorial or other plot device. But what happens when you try that story in the Modern Age?
The answer: The Day of the Krypton Man.
Manipulated by a long-lost Kryptonian artifact whose sole purpose was to recreate Krypton on Earth, and perhaps nudged a little by Maxima's telepathic speed dating invasions, Superman became more cool and logical than a Vulcan and started wearing some Science Guild froufrouwear, keeping to the Fortress of Solitude being serviced by robot attendants. It ends as these things must: After a fight with super alien gladiator Draaga on the moon in the shadow of the Statue of Liberty, the "Krypton Man" brings Ma and Pa Kent to his icy Fortress to tell them his plan to conquer/improve Earth and they bring him back to his humanity. His new costume gets ripped and that makes him wake up and throw the Eradicator into the sun.
And if that isn't some kind of homage to the Silver Age...