Sandra Thigpen

Meredith, Cristina, Izzie and Alex spend their first day as residents with their own interns, including George, repeating his internship after failing his exams, and Meredith's half-sister. Cristina searches for Burke, who is nowhere to be found and Richard resumes his position as chief of surgery.

Joey challenges Phoebe to perform a completely selfless act, Monica gets upset when Chandler gloats about sex, and Ross has a chance to get back together with Emily, but first he must make a tough decision.

The team tries to track down the person who killed a bank employee during a robbery; Lisbon is drawn further into the CBI/FBI rivalry.

When Jenny returns from her trip to Europe, the entire NCIS team will be forced to take a Homeland Security polygraph test, and the deepest secrets of each agent will be revealed. Plus, an unarmed Tony and Jeanne are held hostage by a ruthless drug dealer.

Investigation into the death of an armored-car driver leads Beckett and Castle to one of Esposito's old cases.

Warrick is temporarily in charge when a con artist who is involved with Brass' daughter is murdered and the evidence leads Sara to investigate a counterfeiting operation.