"The Man Who Murdered the Earth"
Lex Luthor constantly trying to find a way to destroy Superman, accidentally destroys civilization.
"The Fabulous World of Krypton: All in the Mind"
Kryptonian archaeologists uncover a globe in which is recorded the story of the war between Erkol and Xan.
"Muto Versus the Man of Tomorrow"
Muto challenges, then succeeds in defeating the Superman of 2466.