I never was into the whole Buffy the Vampire Slayer thing, so to me, Anthony Stewart Head is "that guy who played Frank-N-Furter when I saw The Rocky Horror Show in London after college." (I liked his small role in Scoop, too.) Now Head's official fan website has announced that the actor best known as Buffy's mentor Giles has joined the cast of Repo! The Genetic Opera. The "horror musical" is being directed by Darren Lynn Bousman, who helmed the second through fourth installments in the Saw series. The website says Head has "the lead role" in the futuristic film, which will contain both rock and opera music.

Repo! The Genetic Opera is about a company that creates perfect internal organs ... and if you can't pay for them on time, a repo man will be assigned to remove them. It sounds vaguely Delicatessen-ish to me. As Monika Bartyzel told us in July, Paul Sorvino has been cast as the organ-company owner, and Alexa Vega (Spy Kids) as the daughter of a repo man. Her repo man dad must be important because Shock Till You Drop, where Cinematical first spotted the news, says that's the role Head will be playing. Shock Till You Drop notes another last-minute cast addition, courtesy of Bousman's MySpace page: singer Sarah Brightman.The cast also includes Tobin Bell and, as if the film didn't sound bizarre enough, Paris Hilton in a role that involves singing. Shooting is scheduled to begin this week in Toronto.