Mr. Green
Super Freak
Actually, Doomsday can't be classified as a clone. A clone would have to have the same exact genetic material in all of his cells, whereas Doomsday is birthed by the merging of at least two different "genomes" for a lack of a better term (I mean, who knows how the birth chamber works). If anything, you can call him either the product of the "mating" between Lex and Zod, or Zod himself being mutated. But a "clone"? I don't think so.
Yes, yes, Mr. Green is so wrong. The Universe is now so in trouble. It was a clone of sort of both Zod and Lex, and in the worst possible combination! Bad Mr. Green.