Also, just saying, due to various comic book bullshit at various points the lived multiple whole lives there, either in the past, in alternate dimensions, in computer simulations, after finding it somehow undestroyed for some reason, or keeping its whole capitol city in a bottle. He may have left as a baby and the world may have been destroyed minutes after he left, but this is comics - none of that stops him from going back any time sales start to slip.
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I think that's basically what Cosmo the Superdog from Marvel is, aside from being a supervillain because Cosmo is, crucially, a good dog.
They're all good dogs.
If you want a supervillain, send a monkey to space.