Voight and the team search for answers after discovering a man badly beaten and learning that his fiancee is missing; Lindsay asks Halsted a surprising question; Platt is berated by Fogel for going over his head.

After Platt is physically assaulted while getting into her car, she's rushed to Chicago Med, where Mouch finds himself being questioned; Antonio and the team look for previous threats against Platt.

Lindsay and Ruzek respond when a car crashes through a crowd of concert goers and a gunman opens fire; Burgess sees Atwater's brother somewhere he shouldn't be.

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.

While completing a task assigned by headquarters, Boden makes an unforeseen connection; Gallo is forced to make a surprise rescue of one of their own when the firehouse is called to the site of a construction explosion; Mouch reignites an old feud.

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.

Gallo makes a split-second decision during a dangerous fire rescue, leaving Casey steaming that his direct orders weren't obeyed; Kidd feels a strain in her relationship with Severide; Brett and Mackey search for answers after some suspicious calls.

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.

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.

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.

Mouch, Gallo, Ritter and Mackey report for training; a nasty blow to the head brings Casey unimaginable pain.

Mouch, Gallo, Ritter and Mackey report for training; a nasty blow to the head brings Casey unimaginable pain.

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 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.

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.

While completing a task assigned by headquarters, Boden makes an unforeseen connection; Gallo is forced to make a surprise rescue of one of their own when the firehouse is called to the site of a construction explosion; Mouch reignites an old feud.

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.

Gallo makes a split-second decision during a dangerous fire rescue, leaving Casey steaming that his direct orders weren't obeyed; Kidd feels a strain in her relationship with Severide; Brett and Mackey search for answers after some suspicious calls.

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.

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.

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.

Mouch, Gallo, Ritter and Mackey report for training; a nasty blow to the head brings Casey unimaginable pain.

Mouch, Gallo, Ritter and Mackey report for training; a nasty blow to the head brings Casey unimaginable pain.

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 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.

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.

While completing a task assigned by headquarters, Boden makes an unforeseen connection; Gallo is forced to make a surprise rescue of one of their own when the firehouse is called to the site of a construction explosion; Mouch reignites an old feud.

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.

Gallo makes a split-second decision during a dangerous fire rescue, leaving Casey steaming that his direct orders weren't obeyed; Kidd feels a strain in her relationship with Severide; Brett and Mackey search for answers after some suspicious calls.

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.

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.

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.

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.

A handyman, living rent-free in the home of a generous friend, grows increasingly paranoid about his neighbors; filming them constantly and fighting with them incessantly until conflict escalates out of control and culminates in explosive violence.

When Traci fails to show up for a raid involving a notorious gun dealer, the officers of 15 Division race to find her.

Team One is drawn into a dangerous world of express kidnapping when a ransom drop goes wrong.

A handyman, living rent-free in the home of a generous friend, grows increasingly paranoid about his neighbors; filming them constantly and fighting with them incessantly until conflict escalates out of control and culminates in explosive violence.

When Traci fails to show up for a raid involving a notorious gun dealer, the officers of 15 Division race to find her.

Team One is drawn into a dangerous world of express kidnapping when a ransom drop goes wrong.

A handyman, living rent-free in the home of a generous friend, grows increasingly paranoid about his neighbors; filming them constantly and fighting with them incessantly until conflict escalates out of control and culminates in explosive violence.

When Traci fails to show up for a raid involving a notorious gun dealer, the officers of 15 Division race to find her.

Team One is drawn into a dangerous world of express kidnapping when a ransom drop goes wrong.

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.

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.

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.

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

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

The members of Firehouse 51 struggle to cope when one of their own dies in a fire; as Lts. Casey and Severide blame each other for the tragedy, Casey also secretly goes through a separation.

Jacob Pearce is in custody, but he still has one last card to play, and he unleashes the full scale of his operation to escape; with the taskforce thrown into chaos, Zara and Vincent try their best to out-maneuver and maintain the upper hand.

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.

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.

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.

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

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

The members of Firehouse 51 struggle to cope when one of their own dies in a fire; as Lts. Casey and Severide blame each other for the tragedy, Casey also secretly goes through a separation.

Jacob Pearce is in custody, but he still has one last card to play, and he unleashes the full scale of his operation to escape; with the taskforce thrown into chaos, Zara and Vincent try their best to out-maneuver and maintain the upper hand.

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.

Two women with a shared wall between their townhouses become increasingly volatile with each other; food fights, physical altercations and vandalism come to a bloody climax.

A community-outreach baseball game is interrupted by a drive-by shooting; Sam plans a getaway with Andy.

Ed gambles with his own safety; Robyn drains her family bank accounts to help Dan get out of debt; Dan confesses his love for Robyn.

Two women with a shared wall between their townhouses become increasingly volatile with each other; food fights, physical altercations and vandalism come to a bloody climax.

A community-outreach baseball game is interrupted by a drive-by shooting; Sam plans a getaway with Andy.

Ed gambles with his own safety; Robyn drains her family bank accounts to help Dan get out of debt; Dan confesses his love for Robyn.

Two women with a shared wall between their townhouses become increasingly volatile with each other; food fights, physical altercations and vandalism come to a bloody climax.

A community-outreach baseball game is interrupted by a drive-by shooting; Sam plans a getaway with Andy.

Ed gambles with his own safety; Robyn drains her family bank accounts to help Dan get out of debt; Dan confesses his love for Robyn.

After a deadly chemical spill, the ED goes on lockdown, threatening the lives of several patients and leaving one of Med's own hanging in the balance; Rhodes and Manning must perform lifesaving surgeries.

Choi and Charles use trickery to help a patient with an itch she can't help but scratch; Halstead and Manning argue over a tattooed coma patient; Rhodes angers Goodwin by going against orders to save a patient in the hybrid OR.

Halstead and Manning's wedding day is interrupted when Halstead is forced to make a house call; Charles treats a woman who stabbed her husband; Choi and April deliver a breech baby; Rhodes and Bekker operate on an FBI witness.

A shooting outside the hospital injures April and leaves the ED shaken up; Halstead returns after a stint in the witness relocation program; Charles and Elsa have an emotional confrontation; Bekker is reluctant to attend an event honoring Rhodes.

Halstead takes heat for making an unauthorized move to treat his pregnant patient; Choi becomes personally invested when treating a homeless veteran; Rhodes and Bekker deal with a patient who desperately needs a liver transplant.

Manning and her 3-year-old patient are trapped in a helicopter as the toddler's stats decline; Charles isn't sure Choi's alcoholic patient with liver failure has quite hit rock bottom.

Halstead hides the theft of his gun from a suspicious Manning; tensions are still high between Connor and Bekker, who take a risk operating on an HIV-positive patient; Hank breaks down when he sees a patient from his past.

After a deadly chemical spill, the ED goes on lockdown, threatening the lives of several patients and leaving one of Med's own hanging in the balance; Rhodes and Manning must perform lifesaving surgeries.

Choi and Charles use trickery to help a patient with an itch she can't help but scratch; Halstead and Manning argue over a tattooed coma patient; Rhodes angers Goodwin by going against orders to save a patient in the hybrid OR.

Halstead and Manning's wedding day is interrupted when Halstead is forced to make a house call; Charles treats a woman who stabbed her husband; Choi and April deliver a breech baby; Rhodes and Bekker operate on an FBI witness.

A shooting outside the hospital injures April and leaves the ED shaken up; Halstead returns after a stint in the witness relocation program; Charles and Elsa have an emotional confrontation; Bekker is reluctant to attend an event honoring Rhodes.

Halstead takes heat for making an unauthorized move to treat his pregnant patient; Choi becomes personally invested when treating a homeless veteran; Rhodes and Bekker deal with a patient who desperately needs a liver transplant.

Manning and her 3-year-old patient are trapped in a helicopter as the toddler's stats decline; Charles isn't sure Choi's alcoholic patient with liver failure has quite hit rock bottom.

Halstead hides the theft of his gun from a suspicious Manning; tensions are still high between Connor and Bekker, who take a risk operating on an HIV-positive patient; Hank breaks down when he sees a patient from his past.

After a deadly chemical spill, the ED goes on lockdown, threatening the lives of several patients and leaving one of Med's own hanging in the balance; Rhodes and Manning must perform lifesaving surgeries.

A former cop is moving into a close-knit neighborhood; conflict arises with the whole community over dogs, noise, and other disturbances that keep piling on and ratcheting up until a boiling point is reached, guns are drawn, and blood is spilled.

When Sam and Andy discover that Oliver is the prime suspect in the evidence-room bombing, they become determined to clear his name.

Logan's widow starts a chain reaction campaign to kill people from her husband's captor's families.

A former cop is moving into a close-knit neighborhood; conflict arises with the whole community over dogs, noise, and other disturbances that keep piling on and ratcheting up until a boiling point is reached, guns are drawn, and blood is spilled.

When Sam and Andy discover that Oliver is the prime suspect in the evidence-room bombing, they become determined to clear his name.

Logan's widow starts a chain reaction campaign to kill people from her husband's captor's families.

A former cop is moving into a close-knit neighborhood; conflict arises with the whole community over dogs, noise, and other disturbances that keep piling on and ratcheting up until a boiling point is reached, guns are drawn, and blood is spilled.

When Sam and Andy discover that Oliver is the prime suspect in the evidence-room bombing, they become determined to clear his name.

Logan's widow starts a chain reaction campaign to kill people from her husband's captor's families.

A full moon keeps the crew busy with crazy calls; Athena investigates a potential home invasion; Abby helps investigate a caller's murder; Bobby and Buck have their hands full at a yoga studio for pregnant women; Hen's past may become her future.

Bobby gets a surprising phone call from his doctor after donating at Chimney's blood drive; Athena confronts Michael after having a heart-to-heart with their kids.

The first responders race to help a homeless man crushed in a garbage truck, a mother and son in a crashed elevator, and extreme hoarders trapped in their house; Athena starts dating; the situation with Abby's mother tests her relationship with Buck.

The first responders take calls involving an unusual domestic disturbance, a "death" at a psychic's place, and a motorcycle crash; Bobby dips his toes into the dating pool; Abby walks down memory lane, and Buck is confronted by his past actions.

On one of the hottest days of the year, the first responders must deal with harrowing incidents all around the city; Buck gets a surprise visit from his sister; Athena questions her relationship with Bobby; Buck worries about a handsome new hire.

A massive earthquake rocks Los Angeles; the first responders rush to rescue victims from a crumbling high-rise hotel; Athena must deal with wreckage from a collapsed freeway overpass; Maddie faces her first crisis as a 911 dispatcher.

The first responders continue to deal with the fallout of a massive earthquake; Athena tries to keep the peace as Bobby and team continue to rescue victims from a collapsing high-rise hotel; Maddie must help a pregnant couple deliver their baby.

A full moon keeps the crew busy with crazy calls; Athena investigates a potential home invasion; Abby helps investigate a caller's murder; Bobby and Buck have their hands full at a yoga studio for pregnant women; Hen's past may become her future.

Bobby gets a surprising phone call from his doctor after donating at Chimney's blood drive; Athena confronts Michael after having a heart-to-heart with their kids.

The first responders race to help a homeless man crushed in a garbage truck, a mother and son in a crashed elevator, and extreme hoarders trapped in their house; Athena starts dating; the situation with Abby's mother tests her relationship with Buck.

The first responders take calls involving an unusual domestic disturbance, a "death" at a psychic's place, and a motorcycle crash; Bobby dips his toes into the dating pool; Abby walks down memory lane, and Buck is confronted by his past actions.

On one of the hottest days of the year, the first responders must deal with harrowing incidents all around the city; Buck gets a surprise visit from his sister; Athena questions her relationship with Bobby; Buck worries about a handsome new hire.

A massive earthquake rocks Los Angeles; the first responders rush to rescue victims from a crumbling high-rise hotel; Athena must deal with wreckage from a collapsed freeway overpass; Maddie faces her first crisis as a 911 dispatcher.

The first responders continue to deal with the fallout of a massive earthquake; Athena tries to keep the peace as Bobby and team continue to rescue victims from a collapsing high-rise hotel; Maddie must help a pregnant couple deliver their baby.

A full moon keeps the crew busy with crazy calls; Athena investigates a potential home invasion; Abby helps investigate a caller's murder; Bobby and Buck have their hands full at a yoga studio for pregnant women; Hen's past may become her future.

A former police chief gets into constant conflicts with a young renter who doesn't respect his authority; the war between them intensifies until blood flows down their street.

Andy, Dov, Gail and Nick undertake a risky plan; Traci shadows Steve Peck, hoping to calm her fears about his involvement in the bombing.

Hijackers commandeer a passenger jet to bargain for a prisoners release.

A former police chief gets into constant conflicts with a young renter who doesn't respect his authority; the war between them intensifies until blood flows down their street.

Andy, Dov, Gail and Nick undertake a risky plan; Traci shadows Steve Peck, hoping to calm her fears about his involvement in the bombing.

Hijackers commandeer a passenger jet to bargain for a prisoners release.

A former police chief gets into constant conflicts with a young renter who doesn't respect his authority; the war between them intensifies until blood flows down their street.

Andy, Dov, Gail and Nick undertake a risky plan; Traci shadows Steve Peck, hoping to calm her fears about his involvement in the bombing.

Hijackers commandeer a passenger jet to bargain for a prisoners release.

Connor, who is in hot water with the hospital's Oversight Committee, handles a gunshot victim who has unexpected ties to Halstead; Maggie feels guilty about the return of a former patient; Charles has an awkward first date.

After witnessing a pickup truck plow through a street fair, Natalie and Maggie must make tough decisions on the fly; at the hospital, doctors and nurses are on high alert with the influx of patients; Dr. Charles' ex-wife comes to town with news.

Halstead treats a woman on the verge of freezing to death; Dr. Charles' ex-wife receives some concerning news; Choi handles a lymphoma patient with viral meningitis and a complicated family; Manning makes a house call.

When a car unexpectedly smashes through the ambulance bay doors, Dr. Choi makes some difficult decisions in an effort to save a worker trapped beneath the wreckage and April, who's also in danger.

An alarming phone call prompts Rhodes to rush out of an important surgery; Halstead comes to the aid of an FBI agent who is brought into the ED; Manning and Choi find themselves on opposite sides of a disagreement over doctor-patient confidentiality.

The hospital goes into lockdown mode when a man with a gun holds medical staff hostage; Goodwin is forced to make a tough decision; Dr. Rhodes begins to realize his time with his father is getting short.

Dr. Charles and Dr. Manning disagree on how to handle a patient who they discover is poisoning herself; Dr. Rhodes throws some serious accusations at Dr. Bekker; Dr. Halstead has suspicions about Natalie's new boyfriend; Dr. Choi tends to Bernie.

Connor, who is in hot water with the hospital's Oversight Committee, handles a gunshot victim who has unexpected ties to Halstead; Maggie feels guilty about the return of a former patient; Charles has an awkward first date.

After witnessing a pickup truck plow through a street fair, Natalie and Maggie must make tough decisions on the fly; at the hospital, doctors and nurses are on high alert with the influx of patients; Dr. Charles' ex-wife comes to town with news.

Halstead treats a woman on the verge of freezing to death; Dr. Charles' ex-wife receives some concerning news; Choi handles a lymphoma patient with viral meningitis and a complicated family; Manning makes a house call.

When a car unexpectedly smashes through the ambulance bay doors, Dr. Choi makes some difficult decisions in an effort to save a worker trapped beneath the wreckage and April, who's also in danger.

An alarming phone call prompts Rhodes to rush out of an important surgery; Halstead comes to the aid of an FBI agent who is brought into the ED; Manning and Choi find themselves on opposite sides of a disagreement over doctor-patient confidentiality.

The hospital goes into lockdown mode when a man with a gun holds medical staff hostage; Goodwin is forced to make a tough decision; Dr. Rhodes begins to realize his time with his father is getting short.

Dr. Charles and Dr. Manning disagree on how to handle a patient who they discover is poisoning herself; Dr. Rhodes throws some serious accusations at Dr. Bekker; Dr. Halstead has suspicions about Natalie's new boyfriend; Dr. Choi tends to Bernie.

Connor, who is in hot water with the hospital's Oversight Committee, handles a gunshot victim who has unexpected ties to Halstead; Maggie feels guilty about the return of a former patient; Charles has an awkward first date.

Complaints about dogs running loose lead to the construction of a fence between two long-time neighbors, but the problem isn't solved and flaring tempers lead to fist fights, stabbings, and ultimately a shocking shootout captured on video.

When a heat wave strikes, 15 Division opens to the public as a cooling station; Andy and Marlo search for a missing woman.

Team One must figure out how to get a Chinatown gang to release a local shop owner.

Complaints about dogs running loose lead to the construction of a fence between two long-time neighbors, but the problem isn't solved and flaring tempers lead to fist fights, stabbings, and ultimately a shocking shootout captured on video.

When a heat wave strikes, 15 Division opens to the public as a cooling station; Andy and Marlo search for a missing woman.

Team One must figure out how to get a Chinatown gang to release a local shop owner.

Complaints about dogs running loose lead to the construction of a fence between two long-time neighbors, but the problem isn't solved and flaring tempers lead to fist fights, stabbings, and ultimately a shocking shootout captured on video.

When a heat wave strikes, 15 Division opens to the public as a cooling station; Andy and Marlo search for a missing woman.

Team One must figure out how to get a Chinatown gang to release a local shop owner.

The body of a college student is found with a backpack full of a drug linked to deadly overdoses around the city; Tay finds a bloodied child with a dark story about his parents; Mouse looks to re-enlist in the army.

While responding to a complaint, Burgess and Sorensen find the body of a 16-year-old girl in a baseball player's (Billy Burke) house; Lindsay receives a mysterious delivery that might have ties to her past.

When the only witness to the rape and murder of a young man gets killed, the team suspects that someone was paid to take the victim out; Antonio receives a job offer from the state attorney's office.

A highly trained killer is believed to be targeting the police department; Lindsay speaks to Antonio about his job with the state's attorney.

Severide is brought in for questioning after it is discovered that his car has been involved in a deadly crash; Lindsay considers meeting her estranged father.

While responding to a complaint, Burgess and Sorensen find the body of a 16-year-old girl in a baseball player's (Billy Burke) house; Lindsay receives a mysterious delivery that might have ties to her past.

Colter and rival rewardist Billie Matalon team up to find a missing high school baseball star.

The body of a college student is found with a backpack full of a drug linked to deadly overdoses around the city; Tay finds a bloodied child with a dark story about his parents; Mouse looks to re-enlist in the army.

While responding to a complaint, Burgess and Sorensen find the body of a 16-year-old girl in a baseball player's (Billy Burke) house; Lindsay receives a mysterious delivery that might have ties to her past.

When the only witness to the rape and murder of a young man gets killed, the team suspects that someone was paid to take the victim out; Antonio receives a job offer from the state attorney's office.

A highly trained killer is believed to be targeting the police department; Lindsay speaks to Antonio about his job with the state's attorney.

Severide is brought in for questioning after it is discovered that his car has been involved in a deadly crash; Lindsay considers meeting her estranged father.

When the only witness to the rape and murder of a young man gets killed, the team suspects that someone was paid to take the victim out; Antonio receives a job offer from the state attorney's office.

Colter and rival rewardist Billie Matalon team up to find a missing high school baseball star.

A highly trained killer is believed to be targeting the police department; Lindsay speaks to Antonio about his job with the state's attorney.

Police struggle to identify the body of a woman found floating in the Indian River; with only a piece of nautical rope, a strip of duct tape and some plastic bags to go on, they use every forensic tool they have to catch her killer.

From tropical Hawaii to the frigid waters of Lake Ontario, experts reveal the clues nature leaves behind on a human corpse.

Sophisticated crime fighters map the psychological and physical terrain of multiple murderers.

A priest and parishioners block law enforcement from entering a church where two murder suspects are suspected of hiding; Rixton is caught in a lie with Voight.

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.

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.

Olinsky goes under cover as a hit man for hire after Lindsay is tipped off about a grieving father looking to avenge his daughter's death; when Ruzek returns from his undercover assignment, Voight puts him on patrol duty.

Olinsky's daughter is in critical condition following a massive warehouse fire; Voight investigates the fire's potential origins; intelligence examines connections between the building owner, those who were inside, and potential arson suspects.

A hiker leads intelligence to a young woman being held captive in the woods near Chicago; a former relationship of Halstead's comes back into the picture, much to the surprise of Lindsay.

The investigation leads Intelligence to one of Chicago's wealthiest families after a nighttime photographer is murdered over a piece of mysterious footage; Burgess' sister Nicole visits the district and presents an icy attitude toward Ruzek.

A priest and parishioners block law enforcement from entering a church where two murder suspects are suspected of hiding; Rixton is caught in a lie with Voight.

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.

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.

Olinsky goes under cover as a hit man for hire after Lindsay is tipped off about a grieving father looking to avenge his daughter's death; when Ruzek returns from his undercover assignment, Voight puts him on patrol duty.

Olinsky's daughter is in critical condition following a massive warehouse fire; Voight investigates the fire's potential origins; intelligence examines connections between the building owner, those who were inside, and potential arson suspects.

A hiker leads intelligence to a young woman being held captive in the woods near Chicago; a former relationship of Halstead's comes back into the picture, much to the surprise of Lindsay.

The investigation leads Intelligence to one of Chicago's wealthiest families after a nighttime photographer is murdered over a piece of mysterious footage; Burgess' sister Nicole visits the district and presents an icy attitude toward Ruzek.

A priest and parishioners block law enforcement from entering a church where two murder suspects are suspected of hiding; Rixton is caught in a lie with Voight.

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.

The investigation leads Intelligence to one of Chicago's wealthiest families after a nighttime photographer is murdered over a piece of mysterious footage; Burgess' sister Nicole visits the district and presents an icy attitude toward Ruzek.

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.

Olinsky goes under cover as a hit man for hire after Lindsay is tipped off about a grieving father looking to avenge his daughter's death; when Ruzek returns from his undercover assignment, Voight puts him on patrol duty.

Olinsky's daughter is in critical condition following a massive warehouse fire; Voight investigates the fire's potential origins; intelligence examines connections between the building owner, those who were inside, and potential arson suspects.

A hiker leads intelligence to a young woman being held captive in the woods near Chicago; a former relationship of Halstead's comes back into the picture, much to the surprise of Lindsay.

Police struggle to identify the body of a woman found floating in the Indian River; with only a piece of nautical rope, a strip of duct tape and some plastic bags to go on, they use every forensic tool they have to catch her killer.

Severide hides his serious shoulder injury as he tries to rescue a construction worker from a collapsed building; two teens are trapped in a vehicle.

Casey must decide whether to turn in a cop's son who paralyzed a teen in a drunken-driving accident; Severide learns he has a fractured vertebra; Mills is torn between his mother and the job.

Chief Boden faces accusations that he abandoned a homeless man to die in a warehouse fire; Severide helps an elderly woman; Detective Voight tries to convince Casey not to testify against his son; Shay has to face her ex during a call.

Casey must face the consequences of confronting Detective Voight; Dawson faces disciplinary action; Severide reaches out to an old friend about his injury.

Dawson receives help from a girl she saved; Detective Voight is determined to get Casey to retract his statement.

The Firehouse 51 crew has a Thanksgiving to remember when drugs, a car accident, and a gang shooting get in the way of traditional holiday pastimes.

Peter is deeply upset when a young victim is discovered at the site of a train accident; an abusive mother takes dire actions; Severide's injury is aggravated.

Jose Vargas is forced to go on disability after sustaining an injury in a fire; Severide receives a tempting invitation from a woman he saved from a car crash; Cruz tries to end his brother's involvement with a gang.

An expensive necklace goes missing at the scene of a fire, leading to an internal investigation; Cruz makes a desperate decision to save his brother from a gang war; Dawson invites Casey to a party.

Severide hides his serious shoulder injury as he tries to rescue a construction worker from a collapsed building; two teens are trapped in a vehicle.

Casey must decide whether to turn in a cop's son who paralyzed a teen in a drunken-driving accident; Severide learns he has a fractured vertebra; Mills is torn between his mother and the job.

Chief Boden faces accusations that he abandoned a homeless man to die in a warehouse fire; Severide helps an elderly woman; Detective Voight tries to convince Casey not to testify against his son; Shay has to face her ex during a call.

Casey must face the consequences of confronting Detective Voight; Dawson faces disciplinary action; Severide reaches out to an old friend about his injury.

Dawson receives help from a girl she saved; Detective Voight is determined to get Casey to retract his statement.

The Firehouse 51 crew has a Thanksgiving to remember when drugs, a car accident, and a gang shooting get in the way of traditional holiday pastimes.

Peter is deeply upset when a young victim is discovered at the site of a train accident; an abusive mother takes dire actions; Severide's injury is aggravated.

Jose Vargas is forced to go on disability after sustaining an injury in a fire; Severide receives a tempting invitation from a woman he saved from a car crash; Cruz tries to end his brother's involvement with a gang.

An expensive necklace goes missing at the scene of a fire, leading to an internal investigation; Cruz makes a desperate decision to save his brother from a gang war; Dawson invites Casey to a party.

Severide hides his serious shoulder injury as he tries to rescue a construction worker from a collapsed building; two teens are trapped in a vehicle.

Casey must decide whether to turn in a cop's son who paralyzed a teen in a drunken-driving accident; Severide learns he has a fractured vertebra; Mills is torn between his mother and the job.

Chief Boden faces accusations that he abandoned a homeless man to die in a warehouse fire; Severide helps an elderly woman; Detective Voight tries to convince Casey not to testify against his son; Shay has to face her ex during a call.

Casey must face the consequences of confronting Detective Voight; Dawson faces disciplinary action; Severide reaches out to an old friend about his injury.

Dawson receives help from a girl she saved; Detective Voight is determined to get Casey to retract his statement.

The Firehouse 51 crew has a Thanksgiving to remember when drugs, a car accident, and a gang shooting get in the way of traditional holiday pastimes.

A single woman and her two young sons believe they have found a perfect new apartment, but their overbearing landlord and neighbor soon turns their idyllic situation into a living hell of arguments and intimidation that finally ends in bloodshed.

Andy considers leaving town for a four-month-long undercover project; Jarvis reveals that the division will be restructured.

A violent patient takes a guard hostage and injures a fellow patient.

A single woman and her two young sons believe they have found a perfect new apartment, but their overbearing landlord and neighbor soon turns their idyllic situation into a living hell of arguments and intimidation that finally ends in bloodshed.

Andy considers leaving town for a four-month-long undercover project; Jarvis reveals that the division will be restructured.

A violent patient takes a guard hostage and injures a fellow patient.

A single woman and her two young sons believe they have found a perfect new apartment, but their overbearing landlord and neighbor soon turns their idyllic situation into a living hell of arguments and intimidation that finally ends in bloodshed.

Andy considers leaving town for a four-month-long undercover project; Jarvis reveals that the division will be restructured.

A violent patient takes a guard hostage and injures a fellow patient.

Cruz struggles with guilt and decides to make a confession to Casey; Severide asks Dawson for help with his injury; Herrmann is faced with an unpleasant business deal.

Severide finally decides to discuss his injury with Chief Boden; Casey deals with family issues; Dawson responds to a rescue call and realizes a young girl is the only survivor.

A man dies in a fire set by a troubled teenager; Severide contacts his father; Otis fills in for some shifts at the slowest firehouse in the city; Shay and Dawson wind up in a bad situation.

Severide realizes he shares a similar past with the lieutenant who has been helping out at the firehouse; Dawson shares a secret with Shay; Casey faces family issues.

Dawson turns to an unlikely source for assistance as she tries to help her brother; Severide does a favor for Lt. Whaley; Herrmann and Otis make tough discoveries about their silent partner.

Cruz puts himself and his fellow firefighters in danger; Casey tries to resolve issues with his sister and mother; the team assists the bomb squad with a dangerous call.

A protection officer and an MI6 operative team up after a terrorist attack; they suspect a mole as they race to thwart a larger conspiracy threatening Paris.

Cruz struggles with guilt and decides to make a confession to Casey; Severide asks Dawson for help with his injury; Herrmann is faced with an unpleasant business deal.

Severide finally decides to discuss his injury with Chief Boden; Casey deals with family issues; Dawson responds to a rescue call and realizes a young girl is the only survivor.

A man dies in a fire set by a troubled teenager; Severide contacts his father; Otis fills in for some shifts at the slowest firehouse in the city; Shay and Dawson wind up in a bad situation.

Severide realizes he shares a similar past with the lieutenant who has been helping out at the firehouse; Dawson shares a secret with Shay; Casey faces family issues.

Dawson turns to an unlikely source for assistance as she tries to help her brother; Severide does a favor for Lt. Whaley; Herrmann and Otis make tough discoveries about their silent partner.

Cruz puts himself and his fellow firefighters in danger; Casey tries to resolve issues with his sister and mother; the team assists the bomb squad with a dangerous call.

A protection officer and an MI6 operative team up after a terrorist attack; they suspect a mole as they race to thwart a larger conspiracy threatening Paris.

Cruz struggles with guilt and decides to make a confession to Casey; Severide asks Dawson for help with his injury; Herrmann is faced with an unpleasant business deal.

Once-friendly neighbors on a mountain road become sworn enemies after one family calls police about a theft -- violating the unspoken tradition of leaving authorities out of disputes; years of conflict finally culminate with shots fired.

Andy is left stranded on the side of the road with a dying man and no way to get help on her wedding day.

A bold heist at a stadium lures Team One into an ex-cop's violent plan to defeat the man he blames for ruining his life.

Once-friendly neighbors on a mountain road become sworn enemies after one family calls police about a theft -- violating the unspoken tradition of leaving authorities out of disputes; years of conflict finally culminate with shots fired.

Andy is left stranded on the side of the road with a dying man and no way to get help on her wedding day.

A bold heist at a stadium lures Team One into an ex-cop's violent plan to defeat the man he blames for ruining his life.

Once-friendly neighbors on a mountain road become sworn enemies after one family calls police about a theft -- violating the unspoken tradition of leaving authorities out of disputes; years of conflict finally culminate with shots fired.

Andy is left stranded on the side of the road with a dying man and no way to get help on her wedding day.

A bold heist at a stadium lures Team One into an ex-cop's violent plan to defeat the man he blames for ruining his life.

Caroline shares news that forces Dr. Charles to make a serious decision about their relationship; Maggie meets her sister's new boyfriend but danger may lie ahead; Dr. Rhodes experiences a huge loss; Dr. Choi and April face an unexpected challenge.

Dr. Charles and Caroline set some major plans; Ava fights to keep her relationship with Connor; Agent Lee informs Will of news that may put his life in danger.

A traumatic multi-car accident during a blizzard stretches the hospital staff to the limit; Rhodes and Latham make difficult decisions in triage; Choi handles a severely burned patient who has a final request.

Dr. Rhodes cares for a trauma patient whose accident is a media sensation; a grieving widower relies on a superhero costume; April pushes Halstead to use unproven medications to help a patient with no other options.