In celebration of the series premiere two decades ago on October 6, 2000, a refresher on A-listers who stopped by the CBS series, from John Krasinski to Viola Davis. âFacing an existential threat that could bring down the Crime Lab, a brilliant new team of forensic investigators must welcome back old friends and deploy new techniques to preserve and serve justice in Sin City,â the logline reveals. âTwenty-one years ago, we launched CSIÂ and watched in awe as this new cinematic series launched an entire genre and became a groundbreaking juggernaut that still has global resonance today,â Kelly Kahl, President, CBS Entertainment, said in a statement. âWe are thrilled to welcome the next generation of forensic criminalists to the