The BAU is called to New York when several casualties of a brutal nature are reported in Central Park.

The BAU is called to New York when several casualties of a brutal nature are reported in Central Park.

Derek and Meredith visit the obstetrician and receive disturbing news; Lexie notices April and Meredith growing closer; Jackson tries to get ahead in the operating room.

Shane risks her life when she volunteers to fight an enemy spacecraft with another squadron, led by a former boyfriend whose new love was killed during a mission.