There was an AU comic with a similar premise. In "Superman: Red Son," Clark's space ship landed, not in Kansas, but in the USSR. Long story short, he became a Soviet dictator. He started off with the best of intentions, but lets just say that his actions were nowhere near as noble as 'our' Superman's. I won't say any more for fear of spoiling the comic.
IIRC, there was another AU comic or series of comics in which Batman and Superman were both villains. IIRC, they had been raised by villains. I don't remember either the name of that comic or anything more specific about it. Sorry.
Also, in the DC universe, "Earth Three" had an evil counterpart of Superman called -- get ready for it -- Ultraman! I kid you not.
This site will give you more details, if you wish.
Joy,
Lynn
