Mark Vallarta

Pilot. When a fire claims one of their own, there's plenty of guilt and blame to go around. Lt. Matthew Casey (Jesse Spencer), in charge of the Truck, tries to carry on, but clashes with the brash Lt. Kelly Severide (Taylor Kinney) of the Rescue Squad - and each blames the other for their fallen team member.

The Price We Pay. Voight's son may be involved with the Fitori murder case, intensifying tension between Antonio and Voight, Ruzek helps Burgess get retribution.

In order to get Abruzzi back in command of the prison's work detail -- and the escape plan back on track -- Michael must give up Fibonnaci's location to Philly Falzone. Meanwhile, Michael and Dr. Sara grow closer as the escape gang grows by one. Outside the walls, Kellerman and Hale get some unwanted help tracking down LJ, and Veronica and Nick make a breakthrough.

End Of Watch. Ruzek reunites with an old colleague to take down a crime ring but when things don't add up, Voight and Burgess do some investigating of their own.

Detective Wysocki and Evers encounter uncooperative locals while investigating the death of a teenager in Chinatown; Teresa's brother-in-law gets involved with a shady business deal; Liam goes deeper under cover.