CSI: Crime Scene Investigation (season 13) Las Vegas ("In Vino Veritas"), Phillips heads to a high school reunion ("Dead of the Class"), and an investigation into a series of Dante's Inferno killings bring the CSIs face-to-face Black Sabbath ("Skin in the Game"), before jeopardizing the life of one investigator. In episode thirteen of the season, "CSI" staged a two-part crossover with its spin-off show "" in which Gary Sinise marked his first appearance in "CSI" and as his "CSI: NY" character Mac Taylor; cast member Ted Danson subsequently appeared in the "CSI: NY" portion of the story. Former cast member William Petersen also returned as Gil
CSI: Crime Scene Investigation (season 12) a house ("Stealing Home"), a crippling blackout ("CSI Unplugged"), a murder at an Alice-in-Wonderland style wedding ("Malice in Wonderland"), and a race-truck explosion ("Dune and Gloom"). Later, the troubles continue for the CSI's personal lives, as Finn and D.B. struggle to come to terms with their past relationship, Ecklie is gunned down, Nick leaves CSI, and the Crime Lab is placed under the supervision of an outside agency ("Homecoming"). Ted Danson and Elisabeth Shue join the main cast, replacing Laurence Fishburne, and the outgoing Marg Helgenberger, respectively. Elisabeth Harnois becomes a series regular. Episode 13 of the season is the