Ozzy Osbourne, James Callis Photo

From: Photo Flash: First Look - Ozzy Osbourne Guests on CSI's Season Finale, Airing 5/15

On CSI's upcoming season finale, titled 'Skin In The Game,' as Russell and his team investigate a series of murders, one of their own confronts peril on a dangerous undercover mission to get close to the killer, on the 13th season finale cliffhanger of CSI: CRIME SCENE INVESTIGATION, Wednesday, May 15 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Guest stars include Eric Roberts as brother Daniel Larson, James Callis as writer John Merchiston, Tim Matheson as Oliver Tate, Annabella Sciorra as Nancy Brass and Ozzy Osbourne, Tony Iommi, Thomas D. Clufetos Jr., and Geezer Burler as themselves.