Boden has a lapse in judgment in the aftermath of rescuing a young boy Kidd struggles to win the approval of Severide's mom after a surprise visit Otis takes on new responsibilities at the firehouse.
The crew struggles to come to terms with an injury to one of their own a temporary replacement must be dealt with Boden ponders some interesting news Kidd has a hard time keeping a secret.
Otis and Kidd's lives are put in jeopardy when there's gunfire inside a house Dawson comforts Brett during an especially trying time Casey begins to notice that romance might be going on within the firehouse.
After responding to a car accident, Casey and Dawson become skeptical when a domineering husband continues to answer for his injured wife Cruz is frustrated with Herrmann and Mouch Kidd uncovers something meaningful to Severide.
Dawson asks Severide for help Brett and Kidd compete for Zach's heart Otis, Herrmann and Mouch try to figure out the source of a terrible stench wafting throughout the firehouse.
Dawson must make a tough decision about a father who is addicted to painkillers Herrmann gets into an altercation with a police officer Otis and Cruz go on a mission to find out who Brett is dating Donna's brother unexpectedly comes to town.
Brett attempts to make a lifesaving decision Otis prepares for the grand opening of Molly's North Boden becomes emotional following the rescue of a famous blues player Dawson tries to come to terms with how she has been dealing with her father.
Kidd is surprised to discover she is being transferred out of the firehouse Severide and Casey are suspicious and investigate Otis and Herrmann discuss taking over a rundown bar Dawson's frustration with her father reaches a boiling point.
Casey and Severide find themselves at odds after Casey argues about how to save a teenager entangled in barbed wire Otis tries to convince Casey to participate in the beta test for an expensive piece of new firefighting equipment.
While running a secret errand, Dawson finds herself trapped in a collapsed parking structure pressure mounts on Casey as he begins taking on additional duties Kidd grows increasingly skeptical of Hope.
Casey gets off on the wrong foot with a new chief Casey makes a risky move to save a man threatening to jumping off a building Mouch flies in Cruz's brother Leon as a birthday surprise Brett learns new information about her friend Hope.
A news reporter's murder leads to an investigation into Libya's rebel movement Hetty reveals information about Callen's past.
A scientist hires Hammer for protection, but the private eye's smoking habit leaves his client vulnerable Hammer decides it's time to quit smoking while investigating the tobacco company.
Hammer's friend, who was shot and left for dead, seeks the private eye's help in discovering who ordered the hit.
When Hammer and Gleason stop for a drink before their fishing trip, bank robbers hold them and the others in the bar hostage the detectives have left their guns at home.
A vigilante posts a video online of a man, previously locked up for statutory rape, being beaten and burned alive Lindsay encounters some personal and professional problems.
Intelligence investigates armed bank robberies, which point to some surprising suspects Lindsay is forced to make a decision in the heat of the moment.
The murder weapon in the killing of a teenage boy is linked to a case Voight worked on 17 years ago the victim's father wants Area Central Homicide to take the case.
The team investigates a home explosion that left a charred body, one injured survivor and no witnesses Lindsay and Halstead receive a strange warning about Rixton.
When the crushed body of a young teen who ran away from a treatment center for troubled girls is found in an abandoned building, Voight sends Halstead under cover as a guard to investigate the center from the inside.