CSI: Crime Scene Investigation (season 5) CSI: Crime Scene Investigation (season 5) The fifth season of "" premiered on CBS on September 23, 2004 and ended May 19, 2005. The series stars William Petersen and Marg Helgenberger. Greg begins his journey from a lab rat to a field mouse, as the Las Vegas Crime Lab faces a personnel overhaul ("Ch-Ch-Changes"), during the fifth season of "CSI". The team's final days together are plagued with more investigations into the insane and the unusual, including the discovery of an "alien" corpse just outside the boundary of Area 51 ("Viva Las Vegas"), a body washed up in a thunderstorm
CSI: Crime Scene Investigation (season 8) CSI: Crime Scene Investigation (season 8) The eighth season of "" premiered on CBS on September 27, 2007 and ended May 15, 2008. The season stars William Petersen and Marg Helgenberger. As the CSIs race to save one of their own ("Dead Doll"), Sara makes a life changing decision ("Goodbye and Good Luck"), and one investigator falls ("For Gedda"), in the eighth season of "CSI". Grissom, Willows and their team investigate a decapitation ("A La Cart"), a demonic possession ("Go to Hell"), the death of a hermaphrodite ("The Case of the Cross-Dressing Carp"), the murder of a slasher actress ("The