Secret Wars #this week: I don't think I've ever been so embarrassed for Doom as I feel reading this series. It's like that time (Pre-Crisis, I think) when Lex was in this other planet and he saved that world and made everything better by sciencing the shit out of everything at hand, and everybody loved him and made statues of thing, and they renamed the planet Lexia (I think? that sounds weird even by Pre-Crisis standards, but could be right, and I'm too amused by the idea to google and risk disappointment). Anyway, Lex was basically *it*, and yet he felt unfulfilled (gee, I wonder why), and when he found a cache of old, even-more-advanced technology, he used it to build a supersuit (the one made by Darkseid in post-crisis Superman/Batman, when he went crazy in a different way) that he field-tested by destroying things he had built/saved himself (again, I might be wrong, but that's how I remember it), just to be able to kill Superman.
And when they fought, he ended up destroying the planet, because of course.
ETA: See astolat's comment below for more (and more accurate) details on that wonderful bit of Silver Age crack.