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 6) CSI: Crime Scene Investigation (season 6) The sixth season of "" premiered on CBS on September 22, 2005 and ended May 18, 2006. The series stars William Petersen and Marg Helgenberger. Brass, now partnered with Sofia Curtis, finds himself caught in a shootout that leaves one officer dead, and a Latino community enraged ("A Bullet Runs Through It"), before finding himself critically injured in a hostage standoff ("Bang-Bang"), in the sixth season of "CSI". Meanwhile, Grissom and Willows reunite in order to investigate their toughest cases yet, including the death of a movie star ("Room Service"), a corpse discovered at