5. Bizarro
Another Superman villain made acceptable and known to mass culture through various mentions and references through the 1990's pop culture (like in TV comedy Seinfeld), Bizarro is usually depicted in print and on screen as a clone of Superman (or Superboy) that begins to deteriorate. This character of "abomination" has run the gamut of being interpreted as a mentally-challenged super-powered adult to a vicious, evil, scheming anti-Superman, so even though the origin is often similar, his depiction can be taken from a wide spectrum of styles of the character. The most outlandish versions of Bizarro put him in completely absurd and extreme scenarios, such as Bizarro living on Htrae (Earth spelled backwards), a square shaped planet with an assortment of characters antithetical to our own, like a Bizarro Lois Lane, a poor attempt at cloning Superman's love interest, with all Bizarros speaking in nonsensical babble, using greetings for farewells and vice versa. The more serious tellings of Bizarro's story have dealt with the direct human implications of cloning, especially with the recent headlines of embryonic stem cells being successfully cloned, this may open up a whole new can of worms in the societal debate of cloning, and how would Superman, the paragon of virtue, deal with this "clone", and if "genetic engineering" is the way of conception depicted on Krypton in MoS as its said to be and has been in comics in John Byrne's "Man of Steel" mini-series, how does Kal-El reconcile this with the cloned imperfection he would do battle with, would all be great questions to have answered in the MoS sequel.