David Grant Wright

Someone from Derek and Addison's past arrives in Seattle and shakes things up. Meanwhile, Burke learns about Christina's secret and, after a visit with her mother, Meredith looks into more of her family's dirty laundry.

Alan asks Lyndsey to choose between him and Larry; Jenny worries that she and Brooke are growing apart.

Michael's relationship with the new vice president gets increasingly tense; Pam finds the new copier a challenge.

The BAU looks to outsiders for clues when three college athletes disappear the night of a pep rally; J.J. is instrumental in moving the case forward.

Lightman tries to prove that a brilliant and charming psychology graduate student is a psychopath; Torres and Loker investigate a UFO sighting.

Turtle gets a south-of-the-border business pitch from Alex, but has a hard time believing he isn't being used. Drama enlists Bob Saget to help him smooth out a rough first impression with John Stamos, a potential sitcom co-star. Ari's euphoria after making an NFL pitch to a group of Hollywood high rollers is tempered when he learns that Lizzie may be siphoning off some of his prized clients. Eric and Scott patch up their differences with an eye on Vince's future--and the shared success of their company.