For those of you who saw the Death Battle, you know how powerful Superman can be. If not, link is above for you to find out. (skip to 8:46 for his stats)
But I've found a continuity error. If Kryptonians really are that powerful, then how come a measly planet implosion/explosion killed off most of their race? I understand that they lived under a Red Sun, but they were technologically advanced. Couldn't they have evacuated their population to a yellow star?
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Because a god wanted all but Kal to die. Despair of the Endless (the first one) had the star go supernova and destroy the entire planet except for a single survivor who would spend the rest of his life angsting because he was the one survivor. Of course, the whole angsting part didn't go as planned, and neither did the lone survivor part.