A driver from a rival delivery service befriends Doug, whose buddies are suspicious of the guy's motive; Carrie mentors a troubled 16-year-old girl, but the teen ends up having more of an influence on her.

The BAU investigates an urban vampire in New York who kidnaps his victims at night and holds them underground in the sewer system. Meanwhile, Reid makes an impossible decision in prison that severely affects himself and other inmates.

Part 1 of 2. In the series finale, Doug wants a divorce and refuses to attend Arthur's wedding to Ava St. Clair (Lainie Kazan), which doesn't go quite as planned anyway. Veronica: Anne Meara.

The series concludes with Doug and Carrie deciding whether to stay married and adopt a baby in China, or whether to call everything off. Veronica: Anne Meara. Holly: Nicole Sullivan.