Watch CSI: Crime Scene Investigation series free. CSI: Crime Scene Investigation or also known as CSI: Las Vegas is an American drama series and the first ever CSI franchise of the CSI series. The show follows the story of the criminalists from Las Vegas that works in LVPD (Las Vegas Police Department) as they use physical evidence to solve grisly murders in this unusually graphic drama, which has inspired a host of other cop-show "procedurals". Stars William Petersen, Marg Helgenberger, Gary Dourdan, George Eads, Jorja Fox, Paul Guilfoyle, Eric Szmanda, Robert David Hall, Louise Lombard, Wallace Langham, Lauren, Lee Smith, Laurence Fishburne, Liz Vassey, and David Berman. Now the show got a total of 12 seasons running as of 2011. In the latest season, Ted Danson and Elizabeth Harnois joins the team.
