 With four cases to solve, it will be a long day for every one of our CSIs. Greg has finally found a replacement and is out on his first official case with Grissom as they investigate a shooting at a night club. In order to become a field officer, Greg must pass this last test. Catherine investigates the death of a stripper in a hotel room with multiple blood sprays on its wall. Warrick solves the truth behind the death of a man electrocuted in his own bathtub. Sara and Nick have the strangest of cases as an  alien  is found half-buried in Area 51.