Light Orchestra's "Mr. Blue Sky". This song was first used in the season seven episode "Lab Rats" and last used during season ten's "Field Mice". Several songs by band New Order were used in separate seasons of the show. Their hit "Crystal" even appears as the third track on the official CSI: The Soundtrack, promoted in the Special Features DVD of Season 1. "Someone Like You", which appears on the same album as "Crystal", appears in a Season 8 episode. Several songs from Home Video appeared in the show as well. "Blimp Mason", "We", and "Melon" all appeared once at one point in the season, in their own episodes and seasons. Cast and characters William Petersen as Gil Grissom, the graveyard shift CSI supervisor (regular: seasons 1–9 (until episode 10, "One to Go"); guest star: seasons 9, 11, 13, "Immortality") Grissom is a highly respected forensic entomologist with a doctoral degree in biology from the University of California. When testifying in court he is often addressed as "Doctor Grissom". He became a CSI around 1985 and departed the Las Vegas Crime Lab in 2009. After a short stint as a researcher, Grissom becomes a sea-life advocate and reunites with his ex-wife Sara. The series ends with the two sailing off together from the Port of San Diego. Marg Helgenberger as Catherine Willows, the graveyard shift CSI assistant supervisor (regular: seasons 1–12 (until episode 12, "Willows in the Wind"); guest star: season 14, "Immortality") Catherine is a blood-spatter analyst who joined the CSI team as a lab technician and worked her way up to assistant supervisor, later succeeding Grissom. After a stint as the graveyard shift CSI supervisor, Catherine is demoted following a departmental scandal, and later leaves Las Vegas to join the FBI as a special agent. During the series finale, a recently returned Willows is granted the directorship of the crime lab when Sidle leaves Las Vegas. Gary Dourdan as Warrick Brown, a CSI level III (regular: seasons 1–9 (until episode 1, "For Warrick") Warrick is an audio-video analyst and a native of Las Vegas with a major in chemistry from the University of Nevada, Las Vegas. A recovering gambling addict, Warrick is nonetheless skilled at his job. After being falsely accused, and acquitted, of murder, Brown is assassinated in his car by a corrupt high ranking policeman, Undersheriff Jeffrey McKeen. He dies in Grissom's arms. George Eads as