Williams and Moreno (Malik Yoba, Lauren Velez) are assigned to work with Dets. Delaney and Stone (Marisa Ryan, Josh Hopkins) in a unit. Jordan: Dana Eskelson. Mohammed: Erik Todd Dellums. Franklin: James Whalen. Geraldo: Nelson Vasquez.

After a model's drug overdose, Williams and Barker (Malik Yoba, Tommy Ford) pose as publishers of a new magazine. Milan: Ramy Zada. Rinaldi: Jon Polito. Shelly: Monica Birt. Zev: Emmanuel Xuereb. Chucky: Reigh Mackey.

Since the detectives are unable to move against a drug-dealer due to diplomatic immunity, they decide to shut down his pipeline. Sadovsky: Boris McGiver. Karkov: Richard Council. Hicks: Gerry Bamman. Consul General: Barbara Sukowa.

Williams and Moreno turn up a scam involving organs for transplants. Dr. Royce: Dennis Christopher. Braddock: Ned Eisenberg. Gina: Jennifer Esposito. Homeless Woman: Alice Playten. Leonard: Larry Pine. Birelli: Steven Randazzo.

To stop a mob operation on Wall Street, Williams and Barker (Tommy Ford) pose as underwriters. Sandrelli: Adam Trese. Julie: Justine Miceli. Duvall: Jennifer Burry. Petrello: Scott Cohen. Frankie: Justin Theroux. Gina: Jennifer Esposito.

Delaney (Marisa Ryan) is torn between family ties and duty when her brother (Dean Winters) becomes the suspect in an arson case. Holmquist: J.C. MacKenzie. Ritchie: Michael Eaddy. Epstein: Tony Hoty.

Moreno (Lauren Velez) poses as a bank executive to investigate a money-laundering plan involving her husband's killer. Jordan: Dana Eskelson. Connel: Peter Francis James. Tanner: Kevin O'Rourke. Richele: Lena Cardwell. Perez: Gregory Zaragoza.

In order to uncover the detectives responsible for a series of killings, Williams and Delaney (Malik Yoba, Marisa Ryan) pose as uniformed cops. Van Allen: Joseph Siravo. Maloney: Kevin Geer. Fortner: David Anzuelo. Judge Wood: Catlin Adams.

Following the shooting of a nanny and a baby, Stone, Delaney, Williams and Barker go undercover to try to capture the weapons-suppliers. Sage: David Vadim. Donnor: Tom Mason. Zeke: Darren Epton. Lance: Zachary Taylor. Jake: Gabriel Carpenter.

Moreno poses as a rave organizer and Barker as a video director to catch a serial killer who strikes at the all-night parties. Jonathan ("Punch"): Matt McGrath. Ant: David Wheir. Lana: Tamara Tunie. Gina: Jennifer Esposito. Frankie: Justin Theroux.