Dylan Chalfy

When an unidentified man is found shot and sexually abused in the alley outside of a gay bar, Detectives Benson (Mariska Hargitay) and Stabler (Christopher Meloni) search for possible motives and suspects, tracing the victim's (guest star Mark-Paul Gosselaar) history back to a small town in Arkansas. However, when their investigation leads the detectives deep inside the porn industry, they realize it is not a clear-cut case of rape and attempted murder.

When the son of a Russian gangster is killed at his own engagement party, Danny delves into the world of the Russian mob and the family politics that exist. Meanwhile, Erin is thrown into a high-profile corruption case.

A Russian emigre is poisoned and what appears to be an act of terrorism turns into a revenge plot -- Karl Rostov (guest star Michael Aronov) dies at the hospital after symptoms of a severe stomach flu. The FBI are under the impression that they are dealing with terrorism until the medical examiner finds Ricin in Rostov's body. As Detectives Ed Green (Jesse L. Martin) and Nina Cassady (Milena Govich) dig further a mystery surrounding Rostov's life is unraveled. S. Epatha Merkerson, Fred Dalton Thompson and Alana De La Garza also star.

In the series finale, the POI Team – Finch, Reese, Fusco and Shaw – embark on one final mission to prevent Samaritan from destroying The Machine and cementing its hold over mankind.

When Crazy Eyes struggles to find her place, Vee sees an opportunity. A familiar face returns to Litchfield. Nicky and Big Boo make a friendly wager.