Severide, Kidd and Van Meter investigate a fire at a recording studio. Kylie helps James keep a secret from Boden. Mouch struggles to maintain boundaries with a paramedicine client.

Severide steps in as ranking officer at 51. Kidd fights to save her Girls on Fire program. Cruz’s family is threatened when someone from Javi’s past resurfaces.

Severide goes for an unexpected ride on Truck 81. Ritter’s worlds collide when his secret cop boyfriend helps 51 track down Severide and the missing rig.

Firehouse 51 is forced to share space with Firehouse 17. Kidd and Herrmann fight over Ritter. An arson case tests Kidd and Severide’s relationship. Firehouse 51 says goodbye to one…

Mouch sets out to change his legacy and nickname. Ritter pushes Herrmann to see a doctor. Brett searches for the perfect wedding venue.

Firehouse 51 welcomes back some familiar faces and says goodbye to Brett. Violet scrambles to decorate Brett’s wedding venue. A call at the expo center takes a shocking turn.

Boden, Ritter, Herrmann and Kidd work together to take down a local politician responsible for a chemical fire. After his aunt’s accident, Gallo worries about their future.

Herrmann works on becoming a better man after Cindy’s cancer journey. Kidd bonds with a homeless victim on a call. Kylie takes her firefighter exams. A harrowing call takes a…

Brett waits for life-changing news. Herrmann encounters a psychic with a grave warning on a call. Kidd finds a new lead on the Homeland Security case.

Firehouse 51 helps Herrmann put on a school fundraiser. Carver’s troubled brother comes to town. A grateful citizen is determined to thank Brett and Severide for saving his life.

Kidd, Seager and Carver investigate a fire at the city stables. Kylie clashes with some of the firefighters over changes due to budget cuts. Herrmann struggles to keep it together…

Severide struggles with the cost of helping Det. Pryma with the Martucci case. Gallo campaigns for Herrmann to represent 51 at the National Firefighter’s Association’s Winter Conference. A familiar face…

Det. Pryma’s case comes to an explosive end with Kidd and Carver’s lives in danger. Brett installs an infant safe surrender box at 51. Violet is determined to take Emma…

Firehouse 51 prepares for their semi-annual firehouse inspection. Brett fights to save her paramedicine program. Commander Martin Pearce asks Severide for a favor.

Truck and Squad clash after a tense call rescuing a doomsday prepper. Herrmann struggles with Cindy’s diagnosis. Violet gives Brett and Gallo dating advice.

Kidd and Severide’s honeymoon is interrupted by a dangerous person from their past. Kidd’s former academy classmate joins Firehouse 51. Brett and Violet reflect on their relationships.

Javi spends a couple of shifts at Firehouse 51. Kidd and Carver work together to help Carver’s former boss. As Hawkins and Violet’s relationship blossoms, Gallo turns his attention elsewhere.

Severide and Kidd investigate an explosion at a jewelry store. Cruz and Chloe take steps to make Javi a permanent part of their family. Gallo, Ritter and Mouch try to…

Herrmann is tasked with fulfilling a man’s dying wish. Kidd reflects on her Girls on Fire program after one of her students graduates from the Fire Academy. A heckler harasses…

Severide, Kidd and Van Meter investigate a fire at a recording studio. Kylie helps James keep a secret from Boden. Mouch struggles to maintain boundaries with a paramedicine client.

Severide steps in as ranking officer at 51. Kidd fights to save her Girls on Fire program. Cruz’s family is threatened when someone from Javi’s past resurfaces.

Severide goes for an unexpected ride on Truck 81. Ritter’s worlds collide when his secret cop boyfriend helps 51 track down Severide and the missing rig.

Firehouse 51 is forced to share space with Firehouse 17. Kidd and Herrmann fight over Ritter. An arson case tests Kidd and Severide’s relationship. Firehouse 51 says goodbye to one…

Mouch sets out to change his legacy and nickname. Ritter pushes Herrmann to see a doctor. Brett searches for the perfect wedding venue.

Firehouse 51 welcomes back some familiar faces and says goodbye to Brett. Violet scrambles to decorate Brett’s wedding venue. A call at the expo center takes a shocking turn.

Firehouse 51 tackles a fire caused by a dropped jet engine, and one of their own is accused of a theft related to the incident. Kidd and Boden disapprove of…

The big wedding day arrives and Firehouse 51 welcomes Casey back to celebrate the joyous occasion. Emma’s plans to replace Violet come to a shocking end.

Severide and Kidd work with CPD regarding a suspicious car wreck. Hawkins and Violet’s relationship is in jeopardy. Chloe and Cruz adjust to a new family dynamic.

Firehouse 51 must band together when one of their own is taken hostage.

Severide and Herrmann clash over office space. Boden looks at Pelham’s past as he considers making him permanent. Gallo’s resentment of Pelham comes to a head. Brett and Ritter force…

Gallo, Violet and Ritter debut their microbrewery business at Winterfest. Brett prepares to present her paramedicine program to an oversight panel. Firehouse 51 gets in the holiday spirit.

On a call with Station 37, a firefighter is struck by a power line and decides to lash out after her injury. Brett is visited by Scott and Amelia. Violet…

Severide and Seager team up to investigate a fire at the home of a troubled young woman. Pelham moves into 51’s rumored cursed office. Kylie assists Kidd with Girls on…

Chief Hawkins goes above and beyond to help Brett and Violet with a problem. Kidd pursues an open lieutenant position. A blast from the past asks Mouch and Herrmann for…

Firehouse 51 deals with the aftermath of the capsized boat rescue. Gallo, Ritter and Violet discuss plans for a side gig.

A video of Casey from the roof rescue goes viral. Mouch sets up a Little Free Library at Firehouse 51. Herrmann breaks protocol.

Casey makes a life-altering decision. Gallo, Ritter and Violet agree to an interview and photo shoot. Brett and Mouch launch the paramedicine program. Cruz comes closer to fatherhood.

A major security breach in the city’s computer networks forces Firehouse 51’s senior leaders to take matters into their own hands. Severide gears up for an arson investigation.

Gallo clashes with the new lieutenant temporarily filling in for Casey. Severide closes in on a dangerous and deadly arsonist.

The firehouse reacts to some exciting news, a mysterious stranger arrives and a shocking call takes Severide’s breath away.