Criminal Minds: "Valhalla" -- After a series of suspicious murders occur, Prentiss (Paget Brewster) suspects her old Interpol nemesis, making her fear for the safety of her BAU team as he closes in on her, on CRIMINAL MINDS, Wednesday, March 2 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Photo: Adam Larkey/CBS ©2011 ABC Studios. All Right Reserved.