superman became pure energy in the all star superman comic when he was overloaded by the sun he was going to fix the sun and at the same time was turning into pure energy.
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Superman and Doomsday were equally match if not more so Doomsday. But Superman had advantage of will power, as he always does. Superman used up all his (solar) energy with his final punch too take down Doomsday. Who also did a final punch to take down Superman, who had no energy left so "killed him" (As we know later it didn't) Not worth thinking into. The writers wanted Superman to die and they couldn't leave Doomsday undefeated by Superman, so it was only way to write it.
I was a very small boy, about 5, when I first discovered the old "Adventures of Superman" TV show, then in syndication, in the mid-60s. I have loved Superman ever since.
Yes he is mortal
We all die
Bizarro is the perfect imperfect duplicate of Superman, acting as his antagonist or ally depending on the situation. Originally created to be Superman's clone by his nemesis Lex Luthor, his poorly constructed genetics caused him to become the opposite .