S12, E8: FBI Agent Dana Lewis (guest star Marcia Gay Harden) is assaulted by a stranger and asks Detective Benson (Mariska Hargitay) to have her rape kit tested. Before the cops can really help her, Lewis goes back undercover and refuses to talk about the assignment or the rape, for fear that she will be exposed and pulled off the case. She reluctantly allows Benson and Stabler to get involved in what looks like a protest against the construction of a mosque at Ground Zero, but they find themselves scrambling to put the pieces together of a much larger puzzle than they had anticipated. Also starring: Richard Belzer, Ice-T, Dann Florek, BD Wong, Tamara Tunie and Melissa Sagemiller.