1. Bizarro
Many people may disagree, given that Bizarro is generally considered to be a "classic" Superman villain (although he has also, at some points, been an ally to the Man of Steel), but he simply wouldn't work in a movie. While he's a dangerous foe - possessing the same level of power as Superman, only in "opposite" ways - he's also a complete and utter idiot and a movie version could never be taken seriously. Created to be Superman's clone by his nemesis Lex Luthor, his poorly constructed genetics caused him to become the opposite of Superman in terms of powers (he has freeze vision and heat breath) and in terms of his personality and intelligence (he says things like "me am happy" and "am you crazy?"). He works well in the fun, less mature comic books, but in what has become a very serious business (the comic book movie industry) he would be well and truly out of place.
So there you have it: 5 villains who should be avoided in future Superman movies. Do you agree? Which others do you think should never be used on the big screen? Let us know in the comments box below. And please feel free to follow me on Twitter.