Saruman (Christopher Lee)
Age at the start of The Hobbit: Ludicrously old. He was the first of five wizards to arrive in Middle-earth, a while 2019 years before the action of The Lord Of The Rings.
Whereabouts: Heading up the White Council, despite Galadriel’s strong misgivings — she wanted the less creepy Gandalf for the job.
Does he appear in the book? No. His material would be taken from The Silmarillion and Unfinished Tales, as well as Appendix B to The Lord Of The Rings.
Odds of appearing in the film: Rock-solid. Christopher Lee’s website recently stated, “It now looks certain, providing that he is in good health, that he will be appearing in the movie.” If his health does deteriorate, the part will be recast, but whatever the case, Saruman’s corruption by Sauron will be part of the story.