Guy Nardulli

Marshall, Lily, Robin and Kevin celebrate Valentine's Day with a weekend in Vermont; Barney meets his match.

Morgan, Prentiss, Reid and J.J. try to keep a stalker from reaching the object of his attention; Hotch and Rossi try to determine whether a woman who killed her husband can claim battered-woman syndrome.

Morgan's visit with a survivor of unusual stabbings in upstate New York leads to more questions about the case.

New York City is plunged into darkness; a catastrophic moment changes everyone's lives.

As mobster Nicky Augustine (guest star Mike O’Malley) targets Winona (Natalie Zea) in order to convince Raylan (Timothy Olyphant) to turn over Drew Thompson, Boyd (Walton Goggins) and Ava (Joelle Carter) devise a clever ruse to dispose of a corpse that connects them to a murder.

A police officer in critical condition has bizarre symptoms; Dr. Foreman finds himself in an unpleasant situation.