INTERNAL AFFAIRS DECIDES TO SHAKE THINGS UP WITH VOIGHT AS HE’S ALSO FORCED TO WORK WITH A FORMER PARTNER DURING AN INVESTIGATION – Voight (Jason Beghe) is assigned a new Internal Affairs handler, Stillwell (guest star Ian Bohen) who proves to be suspicious of Voight’s actions. During an investigation involving a gambling ring Voight is forced to work with his former partner from the Gang Unit, Shi (guest star Mark Dacascos). At the same time Halsted (Jesse Lee Soffer) remains fixated on Lonnie Rodiger (guest star Matthew Sherbach) and enlists Jin’s (Archie Kao) help to gather more information. Meanwhile, Ruzek’s (Patrick Flueger) inflated ego leads Olinsky (Elias Koteas) to take him down a peg and offer a great opportunity to Atwater (LaRoyce Hawkins). Jon Seda, Sophia Bush, and Marina Squerciati also star. Sydney Tamiia Poitier guest stars.