Barely Gone. Firehouse 51 is forced to share space with Firehouse 17. An arson case tests Kidd and Severide's relationship. Firehouse 51 says goodbye to one of its own.

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

Trapped. After witnessing a domestic dispute, Brett and Violet take things into their own hands. Mouch vets a new firefighter. Herrmann relies on a new aid on the job.

The Little Things. Julia spends a few days at 51. Boden's stepson is desperate for help for his mother. After a little girl starts a fire, Kidd and her team decide to dig deeper.

On The Hook. Brett and Violet's defibrillator malfunctions on a call. Herrmann tries to find the perfect home for his new recliner. A secret from Gibson's past comes out.

Port In The Storm. Some familiar faces return to Firehouse 51, and Brett says goodbye. Violet scrambles to decorate for Brett's wedding. A call at the expo center turns shocking.

Red Flag. Violet clashes with her new partner. Severide discovers a stash of money on a call and faces off against the cops working the case. Mouch gets a parking ticket.

All The Dark. A hazmat call at a dialysis center leads to a shocking discovery. Boden clashes with Paramedic Chief Robinson. Carver is concerned about Gibson's behavior.

Something About Her. Severide, Kidd and Van Meter investigate a fire at a recording studio. Kylie helps James keep a secret from Boden. Mouch tries to keep boundaries with a client.

The Wrong Guy. 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.

Inside Man. 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.

Under Pressure. Severide and Violet risk clashing with Chief Robinson after Lennox makes a dangerous decision on a call. Cruz and Chloe's marriage problems come to a head.

Never Say Goodbye. Boden makes a decision that impacts the Deputy Commissioner race. A call triggers painful memories for Carver and Damon. Mouch tries to adjust to the new Truck.

Hold On Tight. Kidd and Severide's honeymoon is interrupted by a dangerous person from their past. Kidd's former academy classmate joins Firehouse 51.

Every Scar Tells A Story. Javi spends a couple of shifts at Firehouse 51. Kidd and Carver work together to help Carver's former boss.

Completely Shattered. Kidd recruits Carver, Capp and Tony to help prepare her new lieutenant's quarters. Severide and Detective Pryma reluctantly pair up to work a police investigation.

The Center Of The Universe. Kidd gets a glimpse into Carver's chaotic personal life. Mouch and Herrmann receive an unexpected gift.

Haunted House. Firehouse 51 hosts a Halloween open house. Kidd and Severide help a young girl after she gets kicked out of her home.

All Out Mystery. Severide and Kidd investigate an explosion at a jewelry store. Cruz and Chloe take steps to make Javi a permanent part of their family.

Angry Is Easier. 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 Beautiful Life. Detective Pryma asks for Severide's help on a case involving explosives. Gallo and Carver clash after Gallo improvises on a call.

Nemesis. Severide struggles with the cost of helping Det. Pryma with the Martucci case.

Something For The Pain. 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.

A Guy I Used To Know. Firehouse 51 prepares for their semi-annual firehouse inspection. Brett fights to save her paramedicine program.

How Does It End? Truck and squad clash after a tense call rescuing a doomsday prepper. Herrmann struggles with Cindy's diagnosis.

The Man Of The Moment. Firehouse 51 helps Herrmann put on a school fundraiser. Carver's troubled brother comes to town.

Run Like Hell. As the courageous firefighters, rescue squad and paramedics of Chicago Firehouse 51, they also forge deep, unbreakable bonds with each other.

Damage Control. Kidd, Seager and Carver investigate a fire at the city stables. Kylie clashes with some of the firefighters over changes due to budget cuts.

Acting Up. Cruz feels the burden of his increased responsibilities. Kidd, Gallo and Carver get caught in the middle of a gang war on a call.

The First Symptom. Mouch builds a classic firetruck model for the Deputy District Chief but needs assistance from Gallo and Ritter.

Danger Is All Around. A familiar face returns to Firehouse 51 to serve with Kidd on a special task force.

Take A Shot At The King. Boden, Ritter, Herrmann and Kidd work together to take down a local politician responsible for a chemical fire.

Never, Ever Make A Mistake. Herrmann works on becoming a better man after Cindy's cancer journey. Kidd bonds with a homeless victim on a call.

Change Of Plans. Carver deals with the fallout of his arrest. Brett searches for closure with the baby she rescued. Capp weasels his way into the Firehouse 51 group chat.

Red Waterfall. 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.

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

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

Counting Your Breaths. Griffin learns the truth about his father's death and reveals why he really came to visit Casey. Gallo, Ritter and Violet take steps to expand their microbrewery business.

The Right Thing. Kidd spreads her wings as a lieutenant. Chief Hawkins rides with Ambulance 61 to learn more about Brett. Casey takes a trip out of town. A Ritter date night turns into an emergency situation.

Two Hundred. 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.

Dead Zone. 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.

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

What Happened At Whiskey Point? Severide and Herrmann clash. Boden looks at Pelham's past as he considers making him permanent. Gallo's resentment of Pelham comes to a head. Violet is forced to confront her true feelings for Gallo.

Winterfest. 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.

Back With A Bang. Kidd returns to Firehouse 51. The team must work together to put out a potassium fire in a tunnel. After that incident, Ritter worries about a young cop who witnessed the fiery death of a truck driver.

Fog Of War. 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 gets a surprise envelope. The rest of 51 enters a contest.

Show Of Force. Boden, Kidd and Severide work together to protect one of their own. At the Fire Academy, Herrmann meets an inspiring young man. Talk of the annual CFD Gala dominates the firehouse.

Fire Cop. 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 Fire.

An Officer With Grit. 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 a favor.

The Missing Piece. Following an injury in an industrial fire, Severide investigates an anonymous tip. Kidd searches for someone to fill the open spot on Truck 81. A possible new recruit gets tested at a call.

Hot And Fast. Cruz forms a bond with an immigrant boy he meets while fighting an apartment fire. Squad plans to prank the newest member of their team. Hawkins and Violet struggle to keep their relationship a secret.

Keep You Safe. 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.

What's Inside Of You. Firehouse 51 must band together when one of their own is taken hostage.

Finish What You Started. 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 Kylie's potential new love interest.

Halfway To The Moon. A family friend asks Herrmann for some advice on opening a bar. Tensions run high between Emma and Violet.

Last Chance. Lying Doesn't Protect You From The Truth. Dylan and Ethan treat a patient shot during a drug raid. Charles and Vanessa work together to properly diagnose a motivational speaker.

The Magnificent City Of Chicago. 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.

Rattle Second City. In the season 9 premiere, Firehouse 51 welcomes a new member to the team. Brett's leadership shines.

That Kind Of Heat. Brett and Mackey find their lives in peril. Casey and Brett are in unfamiliar territory. Severide chases a memory while Kidd solves a firehouse problem. Ritter puts himself in harms way during a call.

Smash Therapy. A mishap on the aerial ladder in the midst of a fire rescue leaves Mouch shaken and questioning his abilities. Kidd looks for support from Severide while Casey and Brett discuss their future.

Funny What Things Remind Us. When the firehouse is called to the site of a construction explosion, Gallo is forced to make a surprise rescue to one of their own. Mouch reignites an old feud.

My Lucky Day, When Firehouse 51 is called to the scene of a dangerous blaze inside a 10 story storage unit, Herrmann and Cruz find themselves trapped inside a freight elevator with all communications cut off.

Blow This Up Somehow. Casey is mad when Gallo disobeys his orders during a dangerous rescue. Kidd feels a strain in her relationship with Severide. Brett and Mackey search for answers after a series of suspicious calls.

Dead Of Winter. A fire at a homeless encampment leaves Severide and Casey searching for answers. Cruz is shaken up after a close call. Ritter lends a helping hand to a victim.

Escape Route. A call to a familiar location brings back mixed emotions for Severide. Herrmann heads out for a vacation. Casey is not thrilled with his replacement.

Double Red. Mouch, Gallo, Ritter and Mackey report for training. A nasty blow to the head brings Casey unimaginable pain.

One Crazy Shift. A series of suspicious fires sends 51 on a search for the cause. Casey continues down a troubling path. Mouch is looking to make his long-awaited dream come true.

A Couple Hundred Degrees. A new recruit with ties to the CFD tests Serveride's patience. Violet receives a mysterious note that sends her and Brett on a hunt for the person who wrote it.

Natural Born Firefighter. While Mouch makes an incredible save, all eyes are on a mystery man who helped save his neighbor. Casey worries about his future at the CFD.

Don't Hang Up. A mysterious caller who is in danger relies on Kidd to help save her and her brother. The firehouse helps Cruz get ready for fatherhood.

What Comes Next. A fire breaks out at a pet food factory and Casey and Severide help the owner, Pete, get to the bottom of it. The annual garage sale takes place at 51 and everyone is on edge.

A White Knuckle Panic.Severide and Casey try to find the best fit for Kidd. Ritter, Gallo and Violet help plan an event for Mouch.

No Survivors. The firehouse reacts to some exciting news, a mysterious stranger arrives and a shocking call takes Severide's breath away.

Always. Boden pulls his team together in the aftermath of the explosion. Casey works to track down Severide.

Wow Me. Severide returns to work still reeling from a devastating loss.

Just Drive the Truck. A dangerous fire truck collision sends two firehouses in turmoil.

Apologies Are Dangerous. Dawson begins a new chapter at Firehouse 51.

The Nuclear Option. With a new candidate comes a new dynamic at the Firehouse.

Madmen and Fools. Casey goes to great lengths to protect his sister.

Nobody Touches Anything. A routine house fire reveals evidence that demands the attention of the CPD - story arc crosses over into 'Chicago P.D

Chopper. Firehouse 51 is called to the scene of a harrowing and challenging disaster.

Arrest in Transit. At Firehouse 51 some relationships are tested, while others are strengthened .

Santa Bites. A victim takes credit for a textbook rescue by Chicago finest.

Let Him Die. Two firehouse members are abducted, triggering a desperate search by the Chicago P.D.

Ambush Predator. Surprising evidence is uncovered that sheds new light on the fire that killed Shay.

Three Bells. The search for the serial arsonist leads Severide to meet face-to-face with an old enemy.

Call It Paradise. Chicago finest are left to work in treacherous conditions when a severe ice storm forces its residents into a citywide lockdown.

Headlong Toward Disaster. Boden is forced to take time away and his temporary replacement quickly falls out of favor with members of Firehouse 51,

Red Rag the Bull. Tensions come to a head and careers are put in jeopardy when interim Chief Pridgen squares off against Casey.

Forgive You Anything. Firehouse 51 gets a visit from an old friend of Severide while Mouch faces his fears about meeting his kid.

Forgiving, Relentless, Unconditional. Herrmann saves an infant in a blaze and the repercussions drive him on a search to uncover the truth.

I Am the Apocalypse. The Chicago Fire Team works seamlessly with Chicago Med personnel to help aid victims of a deadly gas leak.

You Know Where to Find Me. Mills makes a critical assessment at the scene of an accident.

We Called Her Jellybean. A fire reveals evidence of a potential serial arsonist who has been on the loose for more than a decade and demands the attention of the CPD and SVU.

Category 5. Tensions between Squad and Truck begin to boil over threatening to divide the house, while Casey goes undercover.

Spartacus. Boden takes charge as divisions continue to threaten the cohesion of the house in the season finale.

A Problem House. An arsonist takes notice of Severide as new red tape causes big changes in the department in the Season Two Premiere.

Prove It. The threat of an arsonist with a vendetta against the firehouse looms and Casey struggles with the repercussions of Heather Darden's accident.

Defcon 1. Severide is convinced he knows the arsonist's identity.

A Nuisance Call. Internal issues threaten to derail Engine Company 51.

A Power Move. The future is uncertain for more than just Boden and Firehouse 51.

Joyriding. A physical workout turns mental for Severide.

No Regrets. The firehouse is tested to the limits when called to the scene of an epic railroad accident and Boden ponders his future.

Rhymes With Shout. A drive-by shooting hits close to home for Cruz and his brother.

You Will Hurt Him. Boden is left to wonder where things stand for Firehouse 51 as McLeod exerts her influence.

Not Like This. The Firehouse is set to close, but 51 is not going down without a fight.

Shoved in My Face. Casey gets back to work after his brush with death.

Out With a Bang. Casey forges ahead at the Firehouse despite signs that he may not be fully recovered from his harrowing accident.

Tonight's the Night. Firehouse 51 steps in when a blackout causes chaos in the community.

Virgin Skin. Despite the mystery surrounding Katie, life moves forward at the Firehouse.

Keep Your Mouth Shut. Despite his frustration, Severide remains hopeful that justice will be served.

A Rocket Blasting Off. With Keeler's whereabouts unknown, the men of Firehouse 51 are looked at as prime suspects.

When Things Got Rough. A Chicago civilians heroic action hits the firehouse in more ways than expected.

Until Your Feet Leave the Ground. Away from the action, new bonds form and old ones strengthen.

A Heavy Weight. Firehouse 51 struggles in the wake of a recent tragedy.

A Dark Day. An explosion at a Chicago hospital rocks the city.

One More Shot. Change is on the horizon at 51, but forgetting the past can be hard.

Real Never Waits. A call to a boarding school leaves Severide questioning himself and Dawson's training is put to the test in the Season Finale.

Pilot. Firehouse 51 works to regroup after a tragedy strikes in the Series Premiere.

Mon Amour. Firehouse 51 works to regroup after a tragedy strikes in the Series Premiere.

Professional Courtesy. Casey is pressured to cover up for a drunk driver.

Professional Courtesy. Casey is pressured to cover up for a drunk driver.

Hanging On. Voight's harassment towards Lieutenant Casey escalates.

Rear View Mirror. An out of control apartment building fire finds Casey laying it all on the line.

Two Families. Thanksgiving proves to be a busy holiday for the firehouse.

Leaving the Station. A train accident leaves Mills doubtful about his future as a firefighter.

It Ain't Easy. An injured firefighter faces life after the job.

Merry Christmas, Etc. Firefighters face theft accusations and an investigation.

God Has Spoken. Cruz struggles with guilt over Flaco's death.

Under the Knife. Severide (Taylor Kinney) faces the consequences of his injury -- and an uncertain future.

Warm and Dead. Chief Boden tries to remedy a situation involving a suspected teenager.

A Little Taste. Tensions rise when Severide (Taylor Kinney) crosses paths with someone from his past.

Nazdarovya!. Dawson puts herself in danger to help her brother.

Viral. Cruz's torment jeopardizes his fellow firefighters.

Better To Lie. Past tensions resurface between Chief Boden and Bennie Severide.

Fireworks. Mills pushes to learn the real story of his father's death -- Treat Williams guest stars.

A Coffin That Small. A firehouse rescue call leaves a lasting impression.

Ambition. Mill's drive to join Squad creates friction within the Firehouse.

Retaliation Hit. Serveride is met with unexpected news, as Voight returns.

Leaders Lead. Severide pulls out all of the stops in hopes of resolving his problems.

Let Her Go. Casey learns that old habits die hard when he is left to deal with Voight.

A Hell Of A Ride. In the Season Finale, a call to the local penitentiary places the squad at risk.