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 Hall, and California State University, Los Angeles. While shooting took place primarily at Universal Studios in Universal City, California, Santa Clarita's surroundings had proven so versatile, "CSI" still shot some outdoor scenes there. "CSI"'s theme song was, since the last episode of season one, "Who Are You", written by Pete Townshend with vocals by lead singer Roger Daltrey of The Who. Daltrey made a special appearance in the episode "Living Legend", which also contained many musical references such as the words "Who's next" on a dry-erase board in the episode's opening sequence. In certain countries, to avoid music licensing fees,