8) SUPERMAN RED/SUPERMAN BLUE
Some people like to list ‘Superman Red/Superman Blue’ as an example of how dumb Silver Age comics used to be.
Those people are WRONG. Seeking to finally overcome all his challenges at once, Superman accidentally splits himself into two beings, each even more intelligent than the original. They revert Kandor to its original size, rebuild their home world, conquer disease, and even manage to fix the “Lois Vs. Lana” question. It’s an example of a really clever “Imaginary Story” (the term for an Elseworlds before it was called Elseworlds.)