Voight witnesses the kidnapping of a young woman with a mysterious connection to his past; intelligence works to find a connection between her kidnapping and several bank robberies; Olinsky gets one step closer to standing trial for Bingham's murder.

Halstead and Atwater go under cover to prevent military-grade weapons from hitting the street; Voight calls in a favor to clear Olinsky's name for Bingham's murder.

Tensions run high as Intelligence seeks justice for Olinsky after he's stabbed in prison; Antonio's loyalty is put to the test; Woods looks to take down Voight once and for all.

With Voight sidelined, Antonio and Ruzek clash as Intelligence races to solve a high-stakes case involving a series of overdose deaths caused by bad heroin.

The shooting of a child in their neighborhood forces Cruz and his brother to think about the gang; Isabella gets Mills to dress up for a gala; Casey feels sad he will be seeing Dawson less; Shay gets in deeper with Devon.

Boden tries to keep the firehouse from closing; the romance between Dawson and Casey grows; Cruz worries for his brother's safety; Severide and Katie make up for lost time.

Chief Boden leads the fight to keep the firehouse open; an emergency call to an apartment structure puts the squad in harm's way; Dawson receives life-changing news.

Casey returns to work after a brush with death; Shay's new partner is friendly to everyone but her; Dawson begins training; Severide prepares for his instructor duties; Clarke refuses to talk to the police about the murder.

Casey tries to convince everyone he is healthy; Shay avoids the lawyer who wants to talk about Daryl's suicide; Otis and Katie grow closer; Boden helps a woman with a negligent landlord.

A drunken driver takes out a transformer, leaving the entire neighborhood without power on a frigid night; Casey continues to lie about his condition.

Severide must leave Lindsay and the Intelligence Unit to find Katie; Blackhawk players Brent Seabrook and Duncan Keith give Shay a tip; Casey gets more information about his head injuries; Dawson works to pass the physical test.

Severide becomes frustrated with the police; a girl is trapped in a donation bin; a fire breaks out in a 20-story building downtown.

Detective Lindsay calls in suspects in the disappearance of Katie's kidnapper; Jones struggles to fit in; Herrmann celebrates his 20th wedding anniversary.

The shooting of a child in their neighborhood forces Cruz and his brother to think about the gang; Isabella gets Mills to dress up for a gala; Casey feels sad he will be seeing Dawson less; Shay gets in deeper with Devon.

Boden tries to keep the firehouse from closing; the romance between Dawson and Casey grows; Cruz worries for his brother's safety; Severide and Katie make up for lost time.

Chief Boden leads the fight to keep the firehouse open; an emergency call to an apartment structure puts the squad in harm's way; Dawson receives life-changing news.

Casey returns to work after a brush with death; Shay's new partner is friendly to everyone but her; Dawson begins training; Severide prepares for his instructor duties; Clarke refuses to talk to the police about the murder.

Casey tries to convince everyone he is healthy; Shay avoids the lawyer who wants to talk about Daryl's suicide; Otis and Katie grow closer; Boden helps a woman with a negligent landlord.

A drunken driver takes out a transformer, leaving the entire neighborhood without power on a frigid night; Casey continues to lie about his condition.

Severide must leave Lindsay and the Intelligence Unit to find Katie; Blackhawk players Brent Seabrook and Duncan Keith give Shay a tip; Casey gets more information about his head injuries; Dawson works to pass the physical test.

Severide becomes frustrated with the police; a girl is trapped in a donation bin; a fire breaks out in a 20-story building downtown.

Detective Lindsay calls in suspects in the disappearance of Katie's kidnapper; Jones struggles to fit in; Herrmann celebrates his 20th wedding anniversary.

The shooting of a child in their neighborhood forces Cruz and his brother to think about the gang; Isabella gets Mills to dress up for a gala; Casey feels sad he will be seeing Dawson less; Shay gets in deeper with Devon.

Boden tries to keep the firehouse from closing; the romance between Dawson and Casey grows; Cruz worries for his brother's safety; Severide and Katie make up for lost time.

Chief Boden leads the fight to keep the firehouse open; an emergency call to an apartment structure puts the squad in harm's way; Dawson receives life-changing news.

Casey returns to work after a brush with death; Shay's new partner is friendly to everyone but her; Dawson begins training; Severide prepares for his instructor duties; Clarke refuses to talk to the police about the murder.

Casey tries to convince everyone he is healthy; Shay avoids the lawyer who wants to talk about Daryl's suicide; Otis and Katie grow closer; Boden helps a woman with a negligent landlord.

A drunken driver takes out a transformer, leaving the entire neighborhood without power on a frigid night; Casey continues to lie about his condition.

A man returns to his hometown after years away; he receives a warm welcome from the residents until the noise from a new neighbor's puppies turns him into a vengeful menace who goes to war with the entire community.

Division 15 starts a city-wide search for an abducted 9-year-old girl; disturbing evidence is uncovered during an interrogation.

Team One confronts a man desperate to keep the promise he made to his deaf nephew by protecting the only place the boy has ever felt safe.

A man returns to his hometown after years away; he receives a warm welcome from the residents until the noise from a new neighbor's puppies turns him into a vengeful menace who goes to war with the entire community.

Division 15 starts a city-wide search for an abducted 9-year-old girl; disturbing evidence is uncovered during an interrogation.

Team One confronts a man desperate to keep the promise he made to his deaf nephew by protecting the only place the boy has ever felt safe.

A man returns to his hometown after years away; he receives a warm welcome from the residents until the noise from a new neighbor's puppies turns him into a vengeful menace who goes to war with the entire community.

Division 15 starts a city-wide search for an abducted 9-year-old girl; disturbing evidence is uncovered during an interrogation.

Team One confronts a man desperate to keep the promise he made to his deaf nephew by protecting the only place the boy has ever felt safe.

Severide feels compelled to help a man he saved from a car accident; Casey and Boden struggle to deal with the orders from Jones' father; a call to duty affects the firehouse.

Lt. Severide tries to help a firefighter from Denver struggling with addiction; Shay and Dawson plan a girls weekend at a cabin in the woods; Mills and the guys update Mouch's online dating profile.

Surprised Dawson receives a suicide note; Severide looks into Bloom's dark past; Shay and Casey search for a life-changing item.

A large explosion sends Chicago into chaos; the members of the firehouse are tested when one of their own goes missing in the blast.

A call to the field may throw a wrench in Dawson's plan to retake the firefighter exam; the firehouse welcomes a new addition; Boden makes a bold move.

A fire at a boarding school shakes up Lt. Severide; Lt. Casey tries to help Dawson; Mills looks into his father's past.

Boden pushes his team to pull it together in the aftermath of the explosion; Casey works to track down a missing Severide; Newhouse brings news about one of Mills' relatives; Herrmann and Otis come up with new goals.

Boden pushes his team to pull it together in the aftermath of the explosion; Casey works to track down a missing Severide; Newhouse brings news about one of Mills' relatives; Herrmann and Otis come up with new goals.

Lt. Severide tries to help a firefighter from Denver struggling with addiction; Shay and Dawson plan a girls weekend at a cabin in the woods; Mills and the guys update Mouch's online dating profile.

Morgan agrees to show Ava around the LAPD, but things quickly take a dangerous turn when the precinct is held hostage by the friends of a recently convicted man.

A large explosion sends Chicago into chaos; the members of the firehouse are tested when one of their own goes missing in the blast.

A call to the field may throw a wrench in Dawson's plan to retake the firefighter exam; the firehouse welcomes a new addition; Boden makes a bold move.

A fire at a boarding school shakes up Lt. Severide; Lt. Casey tries to help Dawson; Mills looks into his father's past.

Boden pushes his team to pull it together in the aftermath of the explosion; Casey works to track down a missing Severide; Newhouse brings news about one of Mills' relatives; Herrmann and Otis come up with new goals.

Severide feels compelled to help a man he saved from a car accident; Casey and Boden struggle to deal with the orders from Jones' father; a call to duty affects the firehouse.

This true-crime series tells the chilling tales of those most unfortunate souls who unwittingly take up residence within a stone's throw of a psycho or killer.

An inmate escapes during a prisoner transport; Gail and Dov try to help a man with amnesia; Traci and Chris help reconstruct notes missing from a court case.

Team One believes a bomb is just the first in a war between rival biker gangs.

This true-crime series tells the chilling tales of those most unfortunate souls who unwittingly take up residence within a stone's throw of a psycho or killer.

An inmate escapes during a prisoner transport; Gail and Dov try to help a man with amnesia; Traci and Chris help reconstruct notes missing from a court case.

Team One believes a bomb is just the first in a war between rival biker gangs.

This true-crime series tells the chilling tales of those most unfortunate souls who unwittingly take up residence within a stone's throw of a psycho or killer.

An inmate escapes during a prisoner transport; Gail and Dov try to help a man with amnesia; Traci and Chris help reconstruct notes missing from a court case.

Team One believes a bomb is just the first in a war between rival biker gangs.

Goodwin announces a new ED Chief, and the choice doesn't make everyone happy; Dr. Manning takes a stand for her patient and finds herself dealing with the repercussions; Dr. Charles tends to family affairs.

Dr. Charles and April team up to take on a mysterious patient in the ED; Dr. Halstead is forced to make a life-or-death decision for one of his trial patients; Dr. Marcel is confronted by his past when a former acquaintance is brought into the ED.

Dr. Marcel and Dr. Manning lay everything on the line to assist a sick woman; Dr. Halstead faces an uphill battle in getting participants involved in his clinical trial; Dr. Choi clashes with a patient who demands absolute perfection of himself.

Dr. Halstead finds continued success in his trial; Dr. Charles' daughter, Anna, receives life-changing news; Noah finds himself in a situation not even April can fix.

Choi helps a patient with chronic pain find a solution; Halstead considers a new path; Charles and Anna bond over a scary situation.

Halstead runs into trouble when one of his trial patients falls ill; his own stress and symptoms have Choi struggling to get through the day.

Choi hires an old Navy colleague to join him in the ED; a final custody hearing threatens to separate Charles and his daughter; Maggie must make a choice that will change Auggie's life.

Goodwin announces a new ED Chief, and the choice doesn't make everyone happy; Dr. Manning takes a stand for her patient and finds herself dealing with the repercussions; Dr. Charles tends to family affairs.

Dr. Charles and April team up to take on a mysterious patient in the ED; Dr. Halstead is forced to make a life-or-death decision for one of his trial patients; Dr. Marcel is confronted by his past when a former acquaintance is brought into the ED.

Dr. Marcel and Dr. Manning lay everything on the line to assist a sick woman; Dr. Halstead faces an uphill battle in getting participants involved in his clinical trial; Dr. Choi clashes with a patient who demands absolute perfection of himself.

Dr. Halstead finds continued success in his trial; Dr. Charles' daughter, Anna, receives life-changing news; Noah finds himself in a situation not even April can fix.

Choi helps a patient with chronic pain find a solution; Halstead considers a new path; Charles and Anna bond over a scary situation.

Halstead runs into trouble when one of his trial patients falls ill; his own stress and symptoms have Choi struggling to get through the day.

Choi hires an old Navy colleague to join him in the ED; a final custody hearing threatens to separate Charles and his daughter; Maggie must make a choice that will change Auggie's life.

Goodwin announces a new ED Chief, and the choice doesn't make everyone happy; Dr. Manning takes a stand for her patient and finds herself dealing with the repercussions; Dr. Charles tends to family affairs.

A peaceful suburb turns upside down when a family learns that the neighbor has kept a secret wife locked in his home for years; things escalate when the family helps her escape with her baby, leading to a bitter feud that ends in terrible bloodshed.

Andy faces the possibility that her father may have murdered someone during a drunken blackout; Chris and Dov's squad car is robbed.

A young man is forced to infiltrate a research facility to memorize the design of a new "smart gun.".

A peaceful suburb turns upside down when a family learns that the neighbor has kept a secret wife locked in his home for years; things escalate when the family helps her escape with her baby, leading to a bitter feud that ends in terrible bloodshed.

Andy faces the possibility that her father may have murdered someone during a drunken blackout; Chris and Dov's squad car is robbed.

A young man is forced to infiltrate a research facility to memorize the design of a new "smart gun.".

A peaceful suburb turns upside down when a family learns that the neighbor has kept a secret wife locked in his home for years; things escalate when the family helps her escape with her baby, leading to a bitter feud that ends in terrible bloodshed.

Andy faces the possibility that her father may have murdered someone during a drunken blackout; Chris and Dov's squad car is robbed.

A young man is forced to infiltrate a research facility to memorize the design of a new "smart gun.".

A stunt driver is caught in a hairy situation; a teenage social influencer is bugging out; the city is on high alert after two mail bombs go off; Eddie's family comes to town; Buck faces a life-or-death situation.

A teenager speeds out of control on the freeway; a routine traffic stop uncovers a shocking kidnapping; Buck struggles with his recovery.

A massive tsunami hits the Santa Monica Pier, jeopardizing the lives of both Buck and Christopher.

A massive tsunami hits the Santa Monica Pier; Buck fears the worst when Christopher goes missing.

The team races to save workers in a high-rise during a fire drill, car accident victims, and siblings fighting over a family heirloom; Buck gives Bobby surprising news; Eddie helps Christopher deal with the trauma caused by the tsunami.

The 118 races to help protesters at a slaughter house and a wife who finds herself trapped in a "rage room" with her husband's mistress; Athena takes action after Michael, May and Harry experience a traumatic traffic stop.

Athena and the 118 respond to bizarre emergency calls on Halloween, including a flock of crows terrorizing a field trip, an office employee having a close encounter with an eight-limbed creature and a ghost-like girl wandering a neighborhood.

A stunt driver is caught in a hairy situation; a teenage social influencer is bugging out; the city is on high alert after two mail bombs go off; Eddie's family comes to town; Buck faces a life-or-death situation.

A teenager speeds out of control on the freeway; a routine traffic stop uncovers a shocking kidnapping; Buck struggles with his recovery.

A massive tsunami hits the Santa Monica Pier, jeopardizing the lives of both Buck and Christopher.

A massive tsunami hits the Santa Monica Pier; Buck fears the worst when Christopher goes missing.

The team races to save workers in a high-rise during a fire drill, car accident victims, and siblings fighting over a family heirloom; Buck gives Bobby surprising news; Eddie helps Christopher deal with the trauma caused by the tsunami.

The 118 races to help protesters at a slaughter house and a wife who finds herself trapped in a "rage room" with her husband's mistress; Athena takes action after Michael, May and Harry experience a traumatic traffic stop.

Athena and the 118 respond to bizarre emergency calls on Halloween, including a flock of crows terrorizing a field trip, an office employee having a close encounter with an eight-limbed creature and a ghost-like girl wandering a neighborhood.

A stunt driver is caught in a hairy situation; a teenage social influencer is bugging out; the city is on high alert after two mail bombs go off; Eddie's family comes to town; Buck faces a life-or-death situation.

A Baptist pastor moves in next-door to a free-spirited older woman in suburban Las Vegas, leading to years of back and forth accusations of dog theft, intimidation and drug use; once the agitation reaches biblical proportions, retribution is wrought.

Andy questions her future with the force after the suspicious death of a young girl; the rookies find out if they have passed their evaluations.

Team One races to track down an armored truck that has vanished.

A Baptist pastor moves in next-door to a free-spirited older woman in suburban Las Vegas, leading to years of back and forth accusations of dog theft, intimidation and drug use; once the agitation reaches biblical proportions, retribution is wrought.

Andy questions her future with the force after the suspicious death of a young girl; the rookies find out if they have passed their evaluations.

Team One races to track down an armored truck that has vanished.

A Baptist pastor moves in next-door to a free-spirited older woman in suburban Las Vegas, leading to years of back and forth accusations of dog theft, intimidation and drug use; once the agitation reaches biblical proportions, retribution is wrought.

Andy questions her future with the force after the suspicious death of a young girl; the rookies find out if they have passed their evaluations.

Team One races to track down an armored truck that has vanished.

As Manning deals with her own trauma, she steps in to help a mother in need; Dean continues to stir the pot with more than one doctor; a patient comes to Med needing immediate treatment but doesn't want it from them.

Marcel deals with a patient who ends up having more in common with him than he thinks; Halstead and Choi clash over a pregnant patient with an irregular heartbeat.

Choi teams up with an unexpected person to treat a famous tennis player who is afraid his career might be over; Goodwin's new protocols cause a stir.

Archer and Choi respond to a scene that brings back some bad memories; when Carol's condition worsens, Manning is willing to do whatever it takes to get her mom feeling better.

An auto accident sends Goodwin into a spiral as she tries to help a young boy and his mother; Manning's secretive behavior begins to draw the attention of Marcel and Halstead.

Third-year med students begin their rotation in the ED, and Maggie keeps a careful eye on one of them; Manning, whose mom's health takes another decline, tries to cover up how she broke the rules to treat her.

Marcel worries he made a surgical error when a recent transplant patient comes in with complications; Carol is once again in distress; Halstead and Manning must take action to right their wrong.

As Manning deals with her own trauma, she steps in to help a mother in need; Dean continues to stir the pot with more than one doctor; a patient comes to Med needing immediate treatment but doesn't want it from them.

Marcel deals with a patient who ends up having more in common with him than he thinks; Halstead and Choi clash over a pregnant patient with an irregular heartbeat.

Choi teams up with an unexpected person to treat a famous tennis player who is afraid his career might be over; Goodwin's new protocols cause a stir.

Archer and Choi respond to a scene that brings back some bad memories; when Carol's condition worsens, Manning is willing to do whatever it takes to get her mom feeling better.

An auto accident sends Goodwin into a spiral as she tries to help a young boy and his mother; Manning's secretive behavior begins to draw the attention of Marcel and Halstead.

Third-year med students begin their rotation in the ED, and Maggie keeps a careful eye on one of them; Manning, whose mom's health takes another decline, tries to cover up how she broke the rules to treat her.

Marcel worries he made a surgical error when a recent transplant patient comes in with complications; Carol is once again in distress; Halstead and Manning must take action to right their wrong.

As Manning deals with her own trauma, she steps in to help a mother in need; Dean continues to stir the pot with more than one doctor; a patient comes to Med needing immediate treatment but doesn't want it from them.

The paranoid delusions of one young man compel him to conspire against the unwitting family next door; over a series of months, his deteriorating mental condition escalates into a midnight shooting, which shakes the foundation of the neighborhood.

An untimely arrest compromises a major drug bust; Andy goes under cover with Swarek; Dov must choose between his girlfriend and his career.

While Dean and Clark go on a ride-along, a shootout breaks out at a drug den.

The paranoid delusions of one young man compel him to conspire against the unwitting family next door; over a series of months, his deteriorating mental condition escalates into a midnight shooting, which shakes the foundation of the neighborhood.

An untimely arrest compromises a major drug bust; Andy goes under cover with Swarek; Dov must choose between his girlfriend and his career.

While Dean and Clark go on a ride-along, a shootout breaks out at a drug den.

The paranoid delusions of one young man compel him to conspire against the unwitting family next door; over a series of months, his deteriorating mental condition escalates into a midnight shooting, which shakes the foundation of the neighborhood.

An untimely arrest compromises a major drug bust; Andy goes under cover with Swarek; Dov must choose between his girlfriend and his career.

While Dean and Clark go on a ride-along, a shootout breaks out at a drug den.

Intelligence joins forces with Firehouse 51 after a devastating high-rise fire is ruled arson, and Halstead, who has a tragic connection to the fire, struggles to stay objective as he gets deeper into the investigation.

Intelligence's investigation into a string of robberies targeting vulnerable immigrants escalates when a teenage girl connected to a critic of the CPD is kidnapped by the robbers.

Burgess finds herself in a difficult situation when she responds to a call while a civilian is in her car for a ride-along that was requested by Brennan.

Intelligence's investigation of a nightclub owner suspected of cocaine distribution is complicated when Ruzek recognizes someone close to him while working undercover.

When the wife of an alderman is beaten to death, Voight finds himself under pressure from Brennan to close the case; Upton shares a dark episode from her past to elicit a confession.

A gang killing leads Carlos to new information on his father's murder; TK contemplates a major life decision; Owen is determined to get Austin's first responders' health care coverages increased.

While searching for missing campers, Colter meets a retired police officer who believes a serial killer is on the loose.

It's Quakers Week, and the ship is bustling with guests obsessed with a quirky trend taking over the cruising industry: rubber duckies; as the voyage unfolds, Avery receives unexpected news.

Intelligence's investigation into a string of robberies targeting vulnerable immigrants escalates when a teenage girl connected to a critic of the CPD is kidnapped by the robbers.

Burgess finds herself in a difficult situation when she responds to a call while a civilian is in her car for a ride-along that was requested by Brennan.

Intelligence's investigation of a nightclub owner suspected of cocaine distribution is complicated when Ruzek recognizes someone close to him while working undercover.

When the wife of an alderman is beaten to death, Voight finds himself under pressure from Brennan to close the case; Upton shares a dark episode from her past to elicit a confession.

A gang killing leads Carlos to new information on his father's murder; TK contemplates a major life decision; Owen is determined to get Austin's first responders' health care coverages increased.

While searching for missing campers, Colter meets a retired police officer who believes a serial killer is on the loose.

It's Quakers Week, and the ship is bustling with guests obsessed with a quirky trend taking over the cruising industry: rubber duckies; as the voyage unfolds, Avery receives unexpected news.

In 1990, Gainesville, Fla., becomes the site of a number of coed murders.

The disappearance of millionaire Frank Black.

CSIs determine that a girl's ex-husband had his parents assassinate her.

As his dependency on prescription painkillers grows, Antonio crosses a line, endangering someone close to him and ultimately putting the entire team at risk.

Intelligence investigates a carjacking turned homicide; Ruzek makes a decision that puts his life and career at risk to protect those close to him.

Intelligence crosses with a mayoral candidate while investigating the fatal shooting of a well-known defense attorney; Antonio returns to work but questions his own judgment when an operation goes sideways.

Voight pursues a suspect against the police commissioner's orders; Halstead puts his career at risk when a case involving a recently released drug dealer turns personal.

When Atwater goes under cover to bring down the longtime head of a criminal enterprise, he becomes entangled in a situation that tests his allegiances as well as his conscience.

Upton and Burgess find themselves in a difficult situation when Intelligence tracks a cache of cop killer machine guns to a local gun show in Wisconsin.

When Cruz's undercover work reveals a lead in a case tracking multiple robberies, the situation escalates quickly, causing friction between Voight's Intelligence Unit and the Chicago Fire Department.

As his dependency on prescription painkillers grows, Antonio crosses a line, endangering someone close to him and ultimately putting the entire team at risk.

Intelligence investigates a carjacking turned homicide; Ruzek makes a decision that puts his life and career at risk to protect those close to him.

Intelligence crosses with a mayoral candidate while investigating the fatal shooting of a well-known defense attorney; Antonio returns to work but questions his own judgment when an operation goes sideways.

Voight pursues a suspect against the police commissioner's orders; Halstead puts his career at risk when a case involving a recently released drug dealer turns personal.

When Atwater goes under cover to bring down the longtime head of a criminal enterprise, he becomes entangled in a situation that tests his allegiances as well as his conscience.

Upton and Burgess find themselves in a difficult situation when Intelligence tracks a cache of cop killer machine guns to a local gun show in Wisconsin.

When Cruz's undercover work reveals a lead in a case tracking multiple robberies, the situation escalates quickly, causing friction between Voight's Intelligence Unit and the Chicago Fire Department.

As his dependency on prescription painkillers grows, Antonio crosses a line, endangering someone close to him and ultimately putting the entire team at risk.

Intelligence investigates a carjacking turned homicide; Ruzek makes a decision that puts his life and career at risk to protect those close to him.

Intelligence crosses with a mayoral candidate while investigating the fatal shooting of a well-known defense attorney; Antonio returns to work but questions his own judgment when an operation goes sideways.

Voight pursues a suspect against the police commissioner's orders; Halstead puts his career at risk when a case involving a recently released drug dealer turns personal.

When Atwater goes under cover to bring down the longtime head of a criminal enterprise, he becomes entangled in a situation that tests his allegiances as well as his conscience.

Upton and Burgess find themselves in a difficult situation when Intelligence tracks a cache of cop killer machine guns to a local gun show in Wisconsin.

When Cruz's undercover work reveals a lead in a case tracking multiple robberies, the situation escalates quickly, causing friction between Voight's Intelligence Unit and the Chicago Fire Department.

Severide comes back to work, but isn't his usual self; Mills discovers more information about his father's family; Herrmann asks Molly investors to share ideas that could help turn the business around.

The members of Firehouse 51 and the Austin firehouse clash when trucks collide on the way to a call; Boden comes up with a plan to get Dawson her badge; Mills faces his past and future; the Molly's group hits a speed bump starting the food truck.

Dawson tries to find balance with Lt. Casey; Mills deals with a future without the squad; Severide faces his demons; the Molly's crew meets with a city inspector.

Casey deals with the fallout from his sister's divorce; Dawson and Mills settle into their new roles at the station; Brett can't decide what she wants to do; the Molly's crew struggles to get the food truck started.

Casey helps his sister and faces down his corrupt brother-in-law; Brett goes out of her way to assist a mother in need; Mills learns about unlicensed private investigation; Dawson starts training with Herrmann.

Severide wants further investigation when a homeowner saved from a fire is found clutching a suspicious box; Molly's II needs a chef.

The members of the firehouse spring into action when a helicopter explodes over a densely populated area, scattering debris; a dangerous man corners Brett.

Dawson and Casey's relationship is tested as the team responds to a truck leaking hydrochloric acid in a busy intersection; Severide learns about Brittany's past; Mouch has dating troubles.

A house fire puts a couple in danger; Dawson and Casey are pushed apart; the Chicago Holiday Fest gives Molly's II a chance to shine.

Severide comes back to work, but isn't his usual self; Mills discovers more information about his father's family; Herrmann asks Molly investors to share ideas that could help turn the business around.

The members of Firehouse 51 and the Austin firehouse clash when trucks collide on the way to a call; Boden comes up with a plan to get Dawson her badge; Mills faces his past and future; the Molly's group hits a speed bump starting the food truck.

Dawson tries to find balance with Lt. Casey; Mills deals with a future without the squad; Severide faces his demons; the Molly's crew meets with a city inspector.

Casey deals with the fallout from his sister's divorce; Dawson and Mills settle into their new roles at the station; Brett can't decide what she wants to do; the Molly's crew struggles to get the food truck started.

Casey helps his sister and faces down his corrupt brother-in-law; Brett goes out of her way to assist a mother in need; Mills learns about unlicensed private investigation; Dawson starts training with Herrmann.

Severide wants further investigation when a homeowner saved from a fire is found clutching a suspicious box; Molly's II needs a chef.

The members of the firehouse spring into action when a helicopter explodes over a densely populated area, scattering debris; a dangerous man corners Brett.

Dawson and Casey's relationship is tested as the team responds to a truck leaking hydrochloric acid in a busy intersection; Severide learns about Brittany's past; Mouch has dating troubles.

A house fire puts a couple in danger; Dawson and Casey are pushed apart; the Chicago Holiday Fest gives Molly's II a chance to shine.

Severide comes back to work, but isn't his usual self; Mills discovers more information about his father's family; Herrmann asks Molly investors to share ideas that could help turn the business around.

The members of Firehouse 51 and the Austin firehouse clash when trucks collide on the way to a call; Boden comes up with a plan to get Dawson her badge; Mills faces his past and future; the Molly's group hits a speed bump starting the food truck.

Dawson tries to find balance with Lt. Casey; Mills deals with a future without the squad; Severide faces his demons; the Molly's crew meets with a city inspector.

Casey deals with the fallout from his sister's divorce; Dawson and Mills settle into their new roles at the station; Brett can't decide what she wants to do; the Molly's crew struggles to get the food truck started.

Casey helps his sister and faces down his corrupt brother-in-law; Brett goes out of her way to assist a mother in need; Mills learns about unlicensed private investigation; Dawson starts training with Herrmann.

Severide wants further investigation when a homeowner saved from a fire is found clutching a suspicious box; Molly's II needs a chef.

A family lends a friend a place to stay but kicks her out after a blowup; instead of moving away, she buys a house across the street, kicking off a yearslong dispute ending in a hail of bullets, blood, death, and a community in shock.

Andy butts heads with Division 15's new detective when they both investigate a shooting at a concert.

Team One races to catch a disturbed and armed man on a ferry.

A family lends a friend a place to stay but kicks her out after a blowup; instead of moving away, she buys a house across the street, kicking off a yearslong dispute ending in a hail of bullets, blood, death, and a community in shock.

Andy butts heads with Division 15's new detective when they both investigate a shooting at a concert.

Team One races to catch a disturbed and armed man on a ferry.

A family lends a friend a place to stay but kicks her out after a blowup; instead of moving away, she buys a house across the street, kicking off a yearslong dispute ending in a hail of bullets, blood, death, and a community in shock.

Andy butts heads with Division 15's new detective when they both investigate a shooting at a concert.

Team One races to catch a disturbed and armed man on a ferry.

Two members of the firehouse go missing after a routine call; Casey and Dawson struggle to balance their personal and professional lives; Boden and Donna learn their baby has potential complications.

Evidence at a storage unit fire seems to be connected to the blaze that took Shay's life; Chaplain Orlovsky is in a car accident.

More clues emerge about the fire that killed Shay, leading Severide to a former nemesis; Shay's sister visits; Cruz is faced with a surprise; Boden tries to help his father.

The pursuit of a missing teenager leaves Mills and Brett stranded in unforgiving elements; members of the firehouse care for an abandoned newborn; Severide receives an intriguing proposal; Boden is at odds with his father (Richard Roundtree).

A temporary chief fills in for Boden, who is forced to take some time off for personal reasons; Lt. Severide deals with an unwelcome addition to the squad; Brett becomes close to a girl she previously rescued; Casey starts seeing a new woman.

Severide steps in when Chief Pridgen tries to shift blame for a tactical error onto Casey; Mouch learns he fathered a child through a sperm donation; Brett and Cruz take Dawson on a double date.

Severide talks to Chief Boden for an old friend who needs a second chance with the fire department; Mills endeavors to regain his active status; Brett and Dawson decide they need a night out.

Two members of the firehouse go missing after a routine call; Casey and Dawson struggle to balance their personal and professional lives; Boden and Donna learn their baby has potential complications.

Evidence at a storage unit fire seems to be connected to the blaze that took Shay's life; Chaplain Orlovsky is in a car accident.

More clues emerge about the fire that killed Shay, leading Severide to a former nemesis; Shay's sister visits; Cruz is faced with a surprise; Boden tries to help his father.

The pursuit of a missing teenager leaves Mills and Brett stranded in unforgiving elements; members of the firehouse care for an abandoned newborn; Severide receives an intriguing proposal; Boden is at odds with his father (Richard Roundtree).

A temporary chief fills in for Boden, who is forced to take some time off for personal reasons; Lt. Severide deals with an unwelcome addition to the squad; Brett becomes close to a girl she previously rescued; Casey starts seeing a new woman.

Severide steps in when Chief Pridgen tries to shift blame for a tactical error onto Casey; Mouch learns he fathered a child through a sperm donation; Brett and Cruz take Dawson on a double date.

Severide talks to Chief Boden for an old friend who needs a second chance with the fire department; Mills endeavors to regain his active status; Brett and Dawson decide they need a night out.

Two members of the firehouse go missing after a routine call; Casey and Dawson struggle to balance their personal and professional lives; Boden and Donna learn their baby has potential complications.

Two neighbors who are down on their luck bond over their struggle; when one buries the other in debt with a hustle gone wrong, things fall apart, but their co-dependence keeps them entwined until an act of revenge.

Andy and Gail go under cover at a drug-riddled club; Traci struggles with her feelings for detective Barber; a woman files a complaint against Dov; Andy opens up to Sam.

A series of bombs tears the city apart, as Team One attempts high-risk rescues.

Two neighbors who are down on their luck bond over their struggle; when one buries the other in debt with a hustle gone wrong, things fall apart, but their co-dependence keeps them entwined until an act of revenge.

Andy and Gail go under cover at a drug-riddled club; Traci struggles with her feelings for detective Barber; a woman files a complaint against Dov; Andy opens up to Sam.

A series of bombs tears the city apart, as Team One attempts high-risk rescues.

Two neighbors who are down on their luck bond over their struggle; when one buries the other in debt with a hustle gone wrong, things fall apart, but their co-dependence keeps them entwined until an act of revenge.

Andy and Gail go under cover at a drug-riddled club; Traci struggles with her feelings for detective Barber; a woman files a complaint against Dov; Andy opens up to Sam.

A series of bombs tears the city apart, as Team One attempts high-risk rescues.

Carol receives a second chance at life when a new heart becomes available; Choi and Archer find themselves in hot water with an old patient; Halstead faces the consequences of the stolen trial medication.

After a neighbor is stabbed, Dr. Choi enlists the help of April to figure out the real cause of the incident; Noah misdiagnoses a patient; Dr. Reese's estranged father comes to Dr. Charles as a patient without her knowledge.

Dr. Manning and Dr. Choi must deliver a baby under dire circumstances; Dr. Rhodes and Dr. Bekker argue about treating a boy with a chronic disease; Dr. Halstead and April are put in an uncomfortable situation; Goodwin and Maggie deal with a lawsuit.

Dr. Halstead and Dr. Manning are at odds over the care of a vegetative man; Dr. Rhodes goes behind Dr. Bekker's back to get his patient at the top of the transplant list; a woman in the waiting room falls asleep and won't wake up.