Ken Watanabe has signed up for director Christopher Nolan’s upcoming sci-fi thriller, Inception, according to The Hollywood Reporter. Watanabe joins a cast that already includes Leonardo DiCaprio, Ellen Page, Joseph Gordon-Levitt, Marion Cotillard, Cillian Murphy, and Michael Caine. The Oscar-nominated Japanese actor (The Last Samurai) is reported to be playing the movie’s villain, who is blackmailing DiCaprio. Watanabe previously worked with Nolan on 2005’s Batman Begins. Inception is scheduled to be released in July 2010.