I didn't want to try to find the old General Grievous thread, so I'm posting this here. From IMDb...

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Oldman to Play Deadliest 'Star Wars' Villain
British actor Gary Oldman will play the "deadliest" Star Wars villain ever in the franchise's final prequel Episode Three. The Harry Potter And The Prisoner Of Azkaban star will voice character General Grievous, who is a part-alien/part-robot. And insiders say Oldman - who is considered to be one of the finest actors of his generation - was handpicked for the part by series creator George Lucas, who is a big fan of his work. A source says, "George thought Gary was the ideal choice." According to reports, Oldman's character will try and hunt down Jedi knights Anakin Skywalker and Obi-wan Kenobi in the film, which is due to hit cinemas next summer.