| Episode cast overview, first billed only: | |||
| Jason Beghe | ... | Hank Voight | |
| Jon Seda | ... | Antonio Dawson | |
| Jesse Lee Soffer | ... | Jay Halstead | |
| Tracy Spiridakos | ... | Hailey Upton | |
| Patrick John Flueger | ... | Adam Ruzek | |
| Marina Squerciati | ... | Kim Burgess | |
| LaRoyce Hawkins | ... | Kevin Atwater | |
| Amy Morton | ... | Trudy Platt | |
| Elias Koteas | ... | Alvin Olinsky | |
| Sofía Lama | ... | Marcella Gomez (as Sofia Lama) | |
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Ricardo Gutiérrez | ... | Marco Rivera (as Ricardo Gutierrez) |
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Chike Johnson | ... | Detective Joe (as Chiké Johnson) |
| Mykelti Williamson | ... | Denny Woods | |
| Gustavo Gomez | ... | Alonzo Amaya | |
| TayLar | ... | Francesca 'Frannie' Jefferson | |
When a gang from El Salvador infiltrates Chicago, intelligence works with a visiting detective to put an end to the crew's brutal tactics. And Antonio finds himself getting close to the Salvadoran Detective, Marcella Gomez, only to learn she has a hidden motive for being in Chicago. Meanwhile, Voight learns that the body of his son's killer has been found. Written by NBC