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) main cast member in a starring role. Wallace Langham joined the main cast. Only 11 episodes had been completed and aired before the 2007 Writers Guild of America strike. Only six more episodes were made after the strike, for a total of only 17 episodes. Some international broadcasters only showed the first part of the crossover "Who and What" because "Without a Trace" did not air (or aired older seasons) at the time. <onlyinclude></onlyinclude> 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