Samuel Hunt

A familiar face steps in when an intelligence detective is abducted by a heroin kingpin. In the season premiere, Intelligence is in pursuit of Derek Keyes (guest star Bokeem Woodbine), number one on Chicago's Most Wanted list and heroin kingpin. Meanwhile, Halstead (Jesse Lee Soffer) tries to get through to Lindsay (Sophia Bush) as her downward spiral continues after her three-week absence from the unit. At District, Olinsky (Elias Koteas) opens up to Platt (Amy Morton) about a secret from his past. Roman (Brian Geraghty) expresses his concerns to Burgess (Marina Squerciati) about what she's getting into by marrying Ruzek (Patrick John Flueger). Jason Beghe, Jon Seda and LaRoyce Hawkins also star. Yuri Sardarov, Markie Post, Nick Gehlfuss and Samuel Hunt guest star.

As District 21 is struggling to come to terms with the loss of one of the team they are forced to put their personal feelings aside when a café is bombed. The unit has several suspects and only one good eye-witness, who happens to be a minor. Halstead (Jesse Lee Soffer) pulls some strings to convince the mom to let him question Isabella (guest star Haley Seda) on what she saw. Atwater (LaRoyce Hawkins) finds himself in hot water when he makes a crucial mistake. Thanks to the tech savvy Mouse (guest star Samuel Hunt) the team is able to gain important intel that could help solve the case. Meanwhile Voight (Jason Beghe) helps Platt (Amy Morton) when she comes up against several roadblocks in an attempt to get a memorial stone for their fallen member. Also starring Jon Seda, Sophia Bush, Patrick Flueger, Elias Koteas, Marina Squerciati and Brian Geraghty. Joe Minoso, Markie Post and Kevin J. O'Connor guest star.

After a botched undercover job, Ruzek is under scrutiny by the new Street Deputy Crowley who will determine his future with the unit. A suspicious person call turns into a murder investigation when Burgess and her temporary partner Price discover the body of a dead man in an SUV. After Mouse identifies the victim as the owner of a security company, the unit soon realizes there might be more to his story. Halstead and Lindsay take a step forward in their relationship.

After a botched undercover job, Ruzek is under scrutiny by the new Street Deputy Crowley who will determine his future with the unit. A suspicious person call turns into a murder investigation when Burgess and her temporary partner Price discover the body of a dead man in an SUV. After Mouse identifies the victim as the owner of a security company, the unit soon realizes there might be more to his story. Halstead and Lindsay take a step forward in their relationship.

Continuation of Chicago Fire, "We Called Her Jelly Bean" episode. Benson (Mariska Hargitay) has traveled into Chicago to help Voight (Jason Beghe) and intelligence with a rape/murder case that is frighteningly similar to a case from New York a decade ago. She calls in Fin (Ice-T) and Amaro (Danny Pino) to assist. The prime suspect, Yates (Dallas Roberts) is let go after rigorous questioning. He then requests a meeting with Lindsay (Sophia Bush) and he warns of unintended consequences from what intelligence is doing.