Watch the trailer for the third episode of season 15 of CSI.
Greg Sanders' first day in the field has him assisting Grissom's investigation of a fatal nightclub shooting. Meanwhile, Catherine probes into the death of a stripper found in a Las Vegas hotel suite. Across town, Warrick is called to an apartment building to investigate possible foul play in the death of a man found electrocuted in his bathtub. Lastly, Nick and Sara investigate a body found buried wearing an alien costume near Area 51. Back in the lab, Greg Sanders' replacement, Chandra, is overwhelmed by the fast-paced world of the CSIs.