With time running down until the series finale airs for Smallville this May, one of the few hopes that fans had for a bit of additional closure and fun looks like it won't happen as Entertainment Weekly has confirmed that Michael Rosenbaum, aka Lex Luthor, has rebuffed all efforts to appear in some form. Rosenbaum left the show a couple of seasons ago for a variety of reasons and has, according to people in the know, put the whole show behind him.
him and moved on,” says a knowledgeable source. “He’s pursuing his other creative outlet [writing]. By all indications, he is not going to be involved.”
Rosenbaum has had his issues with the show before but for fans, it's seen as the final snub by him over it as it's one of the biggest requests they have for finishing out the series outside of seeing Tom Welling suit up as the Man of Steel. With actors generally hating the idea of being typecast by certain roles they have, and seven years as one character can be hard to shake off, it's something that can hurt them in future endeavors as well by not at least paying it some form of lip service. As the EW article says, a couple of hours worth of work to make a lot of people very happy and to show you're not really a bad guy is one of the better pr moves you can make.