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 6) a suburban home ("Bite Me"), a mass suicide at a cult ("Shooting Stars"), and an apparent suicide ("Secrets and Flies"), as Nick comes to terms with his PTSD ("Bodies in Motion"), and later tracks down a missing child ("Gum Drops"). Also this season, Greg hunts the head of a civil war reenactor ("Way to Go"), Grissom investigates the death of a psychic ("Spellbound"), and Sara comes face to face with her toughest adversary yet ("The Unusual Suspect"). <onlyinclude></onlyinclude> CSI: Crime Scene Investigation (season 6) The sixth season of "" premiered on CBS on September 22, 2005 and ended May 18,