Ruzek and Atwater go under cover as prison inmates in order to find the man they believe killed a 10-year-old girl; Burgess and Roman give a tour of the district to some boys they believe are part of the Police Explorers program.

Detectives from New York's SVU come to Chicago to help take down a pedophilia ring; Platt shows her respect for the police.

When Asher is killed while Antonio is on his security duty, Voight and Olinsky make sure he is covered; Halstead and Lindsay go under cover; Kot wants an answer from Lindsay.

Following a big heroin bust, Olinsky learns that the suspects are holding his wife hostage; Burgess and Roman get an assignment that pairs them with a K-9 officer: Roman's former partner (Spencer Grammer).

When Severide's father (Treat Williams) visits, he clashes with Chief Boden over a former colleague's death; Shay makes a decision about Clarice; the mystery about Herrmann, Otis and Dawson's bar is revealed.

Mills questions Bennie about the fire that killed Mills' father; Casey, Severide and Bennie investigate two mysterious diner fires.

A failed rescue attempt deeply affects the men and women of firehouse 51; Dawson and Shay deal with a junkie's crazy behavior during a call; the team upsets local drug dealers.

A paramedic candidate joins Shay and Dawson for a few shifts; Cindy Herrmann experiences pregnancy complications while her husband is out of town; Casey receives an unexpected visit.

Detective Voight shows up, looking to cash in the favor Dawson owes him; Casey's social life takes on a familiar pattern; Molly prepares for the grand opening of Dawson, Herrmann and Otis's bar; Severide faces a threat to his career.

Severide is accused of sexual misconduct; Casey starts to find satisfaction in his personal life; Dawson and Mills face challenges as they try to take their relationship to the next level; the squad faces a harrowing building collapse.

Lt. Casey must work with Voight and the Intelligence Unit; Shay grows increasingly excited about the prospect of motherhood; everyone comes together to support the opening of Molly's.

The squad must help defuse a volatile situation at the jail; Shay continues to be hopeful about motherhood; Herrmann's wife goes into labor; Mills and Dawson face important decisions.

Lt. Severide is targeted by an arsonist; Battalion Chief Boden clashes with Gail McLeod; the anniversary of Andy's death; Shay has suspicions; Mari visits Mouch.

When Severide's father (Treat Williams) visits, he clashes with Chief Boden over a former colleague's death; Shay makes a decision about Clarice; the mystery about Herrmann, Otis and Dawson's bar is revealed.

Mills questions Bennie about the fire that killed Mills' father; Casey, Severide and Bennie investigate two mysterious diner fires.

A failed rescue attempt deeply affects the men and women of firehouse 51; Dawson and Shay deal with a junkie's crazy behavior during a call; the team upsets local drug dealers.

A paramedic candidate joins Shay and Dawson for a few shifts; Cindy Herrmann experiences pregnancy complications while her husband is out of town; Casey receives an unexpected visit.

Detective Voight shows up, looking to cash in the favor Dawson owes him; Casey's social life takes on a familiar pattern; Molly prepares for the grand opening of Dawson, Herrmann and Otis's bar; Severide faces a threat to his career.

Severide is accused of sexual misconduct; Casey starts to find satisfaction in his personal life; Dawson and Mills face challenges as they try to take their relationship to the next level; the squad faces a harrowing building collapse.

Lt. Casey must work with Voight and the Intelligence Unit; Shay grows increasingly excited about the prospect of motherhood; everyone comes together to support the opening of Molly's.

The squad must help defuse a volatile situation at the jail; Shay continues to be hopeful about motherhood; Herrmann's wife goes into labor; Mills and Dawson face important decisions.

Lt. Severide is targeted by an arsonist; Battalion Chief Boden clashes with Gail McLeod; the anniversary of Andy's death; Shay has suspicions; Mari visits Mouch.

When Severide's father (Treat Williams) visits, he clashes with Chief Boden over a former colleague's death; Shay makes a decision about Clarice; the mystery about Herrmann, Otis and Dawson's bar is revealed.

Mills questions Bennie about the fire that killed Mills' father; Casey, Severide and Bennie investigate two mysterious diner fires.

A failed rescue attempt deeply affects the men and women of firehouse 51; Dawson and Shay deal with a junkie's crazy behavior during a call; the team upsets local drug dealers.

A paramedic candidate joins Shay and Dawson for a few shifts; Cindy Herrmann experiences pregnancy complications while her husband is out of town; Casey receives an unexpected visit.

Detective Voight shows up, looking to cash in the favor Dawson owes him; Casey's social life takes on a familiar pattern; Molly prepares for the grand opening of Dawson, Herrmann and Otis's bar; Severide faces a threat to his career.

Severide is accused of sexual misconduct; Casey starts to find satisfaction in his personal life; Dawson and Mills face challenges as they try to take their relationship to the next level; the squad faces a harrowing building collapse.

A single mother of four children finds the perfect house in New Orleans, then a robbery at a neighbor's home leads to a misunderstanding, then to paranoia, conflict and bloodshed.

A nurse is the main suspect of five bodies found in a wooded area in central Florida.

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

A single mother of four children finds the perfect house in New Orleans, then a robbery at a neighbor's home leads to a misunderstanding, then to paranoia, conflict and bloodshed.

A nurse is the main suspect of five bodies found in a wooded area in central Florida.

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

A single mother of four children finds the perfect house in New Orleans, then a robbery at a neighbor's home leads to a misunderstanding, then to paranoia, conflict and bloodshed.

A nurse is the main suspect of five bodies found in a wooded area in central Florida.

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

Casey struggles with his new responsibilities; Severide dreads the arsonist's next attack; Mouch starts campaigning; Dawson and Shay decide they need to get out more.

Severide tries to prove his suspicions about the arsonist's identity; Casey gets accustomed to his new lifestyle; Dawson goes on a date with a regular from the bar.

Severide wants to implicate the serial arsonist; Dawson and Shay face the unexpected on a routine call; suspicions indicate Clarke is the mole; Mouch campaigns for union president.

McLeod pushes Boden toward an early retirement and chooses a potential replacement; all make known their disdain for the mole; Shay enjoys a full social life.

Severide comes across a boy in need of help while out on a jog; Boden and McLeod clash over the future of the firehouse; Mouch and Greg Sullivan debate on Otis' podcast.

The firehouse crew goes to the scene of a railroad accident; Boden must make a big decision about his future; Severide learns more about the woman he saw with his father; Shay and Dawson continue to butt heads.

Imogen reunites Adilah with her daughter in Paris as truth and lies become further blurred.

Casey struggles with his new responsibilities; Severide dreads the arsonist's next attack; Mouch starts campaigning; Dawson and Shay decide they need to get out more.

Severide tries to prove his suspicions about the arsonist's identity; Casey gets accustomed to his new lifestyle; Dawson goes on a date with a regular from the bar.

Severide wants to implicate the serial arsonist; Dawson and Shay face the unexpected on a routine call; suspicions indicate Clarke is the mole; Mouch campaigns for union president.

McLeod pushes Boden toward an early retirement and chooses a potential replacement; all make known their disdain for the mole; Shay enjoys a full social life.

Severide comes across a boy in need of help while out on a jog; Boden and McLeod clash over the future of the firehouse; Mouch and Greg Sullivan debate on Otis' podcast.

The firehouse crew goes to the scene of a railroad accident; Boden must make a big decision about his future; Severide learns more about the woman he saw with his father; Shay and Dawson continue to butt heads.

Imogen reunites Adilah with her daughter in Paris as truth and lies become further blurred.

Casey struggles with his new responsibilities; Severide dreads the arsonist's next attack; Mouch starts campaigning; Dawson and Shay decide they need to get out more.

A decorated police officer relies on his neighbors to help him take care of his beloved daughter, then she accuses one of them of molesting her, and all hell breaks loose.

A search mission for three women missing in Yosemite Park turns to a murder investigation when two are discovered in the trunk of their burned out car.

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

A decorated police officer relies on his neighbors to help him take care of his beloved daughter, then she accuses one of them of molesting her, and all hell breaks loose.

A search mission for three women missing in Yosemite Park turns to a murder investigation when two are discovered in the trunk of their burned out car.

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

A decorated police officer relies on his neighbors to help him take care of his beloved daughter, then she accuses one of them of molesting her, and all hell breaks loose.

A search mission for three women missing in Yosemite Park turns to a murder investigation when two are discovered in the trunk of their burned out car.

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

Marcel adjusts to his newfound fame when he helps Halstead treat a local restaurant owner; Choi, Charles and Goodwin aid a new mother who is worried about hurting her baby; Maggie and Taylor clash with a patient who is eager to get back to work.

Med runs out of scrubs, forcing the staff to improvise; the life of Archer's son is in danger; Marcel and Charles help a kidney transplant patient experiencing psychosis; Asher and Halstead grow closer.

Halstead and Marcel facilitate a trans-organ exchange; Asher and Cuevas help a sexual assault survivor; Choi and Archer treat a patient whose case could expose a fraudulent doctor; Grant and Maggie take a trip down memory lane.

Halstead relies on Marcel and Med's newly donated OR 2.0 to save his patient; Charles helps an elderly, confused patient who's mourning the loss of his high school sweetheart; as their wedding day approaches, Choi and April run into some roadblocks.

Charles and Cuevas help an elderly patient and her developmentally disabled grandson; Halstead treats a swimmer with a heart condition; Marcel considers using the OR 2.0 for surgery; Asher and Lieu search for a pregnant woman lost in the woods.

Marcel and Charles treat Lieu's gym buddy; Maggie and Halstead help a robbery-homicide suspect; Asher and Archer use Med's new opiate abuse AI program.

Goodwin, Maggie and Marcel help victims of a hit-and-run accident; Halstead struggles to diagnose a patient with seizures; Asher and Archer clash with Jack Dayton.

Marcel adjusts to his newfound fame when he helps Halstead treat a local restaurant owner; Choi, Charles and Goodwin aid a new mother who is worried about hurting her baby; Maggie and Taylor clash with a patient who is eager to get back to work.

Med runs out of scrubs, forcing the staff to improvise; the life of Archer's son is in danger; Marcel and Charles help a kidney transplant patient experiencing psychosis; Asher and Halstead grow closer.

Halstead and Marcel facilitate a trans-organ exchange; Asher and Cuevas help a sexual assault survivor; Choi and Archer treat a patient whose case could expose a fraudulent doctor; Grant and Maggie take a trip down memory lane.

Halstead relies on Marcel and Med's newly donated OR 2.0 to save his patient; Charles helps an elderly, confused patient who's mourning the loss of his high school sweetheart; as their wedding day approaches, Choi and April run into some roadblocks.

Charles and Cuevas help an elderly patient and her developmentally disabled grandson; Halstead treats a swimmer with a heart condition; Marcel considers using the OR 2.0 for surgery; Asher and Lieu search for a pregnant woman lost in the woods.

Marcel and Charles treat Lieu's gym buddy; Maggie and Halstead help a robbery-homicide suspect; Asher and Archer use Med's new opiate abuse AI program.

Goodwin, Maggie and Marcel help victims of a hit-and-run accident; Halstead struggles to diagnose a patient with seizures; Asher and Archer clash with Jack Dayton.

Marcel adjusts to his newfound fame when he helps Halstead treat a local restaurant owner; Choi, Charles and Goodwin aid a new mother who is worried about hurting her baby; Maggie and Taylor clash with a patient who is eager to get back to work.

In New Brighton, Minn., two neighbors get along great until one of them catches Lyme Disease from the deer the other feeds on his property, then the ensuing blame game leads to rising hostility and ends in gunfire.

Police search for the killer of an elderly upscale Toronto couple.

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

In New Brighton, Minn., two neighbors get along great until one of them catches Lyme Disease from the deer the other feeds on his property, then the ensuing blame game leads to rising hostility and ends in gunfire.

Police search for the killer of an elderly upscale Toronto couple.

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

In New Brighton, Minn., two neighbors get along great until one of them catches Lyme Disease from the deer the other feeds on his property, then the ensuing blame game leads to rising hostility and ends in gunfire.

Police search for the killer of an elderly upscale Toronto couple.

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

Responding to a fire at a prison, Bobby and the 118 find themselves trapped in a deadly riot.

A man claims he was carjacked, shot and buried alive; a homeowner thinks her roommate is a ghost; Hen receives a visit from the past; Athena and family are concerned that Harry is still haunted by visions of Jeffrey.

Bobby and the 118 race to save lives after an explosion rocks the hospital where Dr. David Hale is performing surgery; Michael makes a life-changing decision.

An abandoned oil well erupts and causes a massive sinkhole in downtown LA; Athena investigates a 30-year-old cold case involving a casino robbery; Buck fears his relationship with Taylor might be ending.

The members of the 118 are called to a series of emergencies around Christmas Eve; Eddie struggles with an emotional Christopher.

Cal believes that Maggie's missing her career, while relationships come to a head at the opening of Rob's restaurant.

Chimney is determined to find a missing Maddie amongst the chaos of St. Patrick's Day.

Responding to a fire at a prison, Bobby and the 118 find themselves trapped in a deadly riot.

A man claims he was carjacked, shot and buried alive; a homeowner thinks her roommate is a ghost; Hen receives a visit from the past; Athena and family are concerned that Harry is still haunted by visions of Jeffrey.

Bobby and the 118 race to save lives after an explosion rocks the hospital where Dr. David Hale is performing surgery; Michael makes a life-changing decision.

An abandoned oil well erupts and causes a massive sinkhole in downtown LA; Athena investigates a 30-year-old cold case involving a casino robbery; Buck fears his relationship with Taylor might be ending.

The members of the 118 are called to a series of emergencies around Christmas Eve; Eddie struggles with an emotional Christopher.

Cal believes that Maggie's missing her career, while relationships come to a head at the opening of Rob's restaurant.

Chimney is determined to find a missing Maddie amongst the chaos of St. Patrick's Day.

Responding to a fire at a prison, Bobby and the 118 find themselves trapped in a deadly riot.

In an apartment building, two young couples walk around on eggshells because of a neighbor who can't stand one couple's music and the other's dog, then all hell breaks loose, and a violent rampage ensues.

The largest police investigation of the decade lasted 23 days to catch a sniper who terrorized Washington, D. C. residents.

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

In an apartment building, two young couples walk around on eggshells because of a neighbor who can't stand one couple's music and the other's dog, then all hell breaks loose, and a violent rampage ensues.

The largest police investigation of the decade lasted 23 days to catch a sniper who terrorized Washington, D. C. residents.

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

In an apartment building, two young couples walk around on eggshells because of a neighbor who can't stand one couple's music and the other's dog, then all hell breaks loose, and a violent rampage ensues.

The largest police investigation of the decade lasted 23 days to catch a sniper who terrorized Washington, D. C. residents.

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

A brutal storm rocks Chicago; Halstead encourages Dr. Grace Song to go against her own findings for the benefit of their patient; Asher rushes to the hospital to help Archer's pregnant patient; Maggie's concern for Ben consumes her.

Goodwin and Charles clash as negotiations drag on between the administration and the custodial workers' union; Asher fights to keep a mother and her newborn baby together.

The hospital is in disarray when the janitors go on strike; Marcel treats a young girl injured on her family's farm; Charles and Cuevas' schizophrenic patient returns to Med; Archer encounters a patient with foreign material in her stomach.

Halstead and Cuevas struggle to diagnose a patient with a rare disorder; CFD and Med staff work to free a paranoid father trapped in the MRI suite; Tanaka-Reed gets an ego check.

A documentary crew visits Med to film Marcel and Abrams' groundbreaking surgery; Archer refuses to ask for help for his kidney issues despite the staff's unrelenting kindness; Halstead starts to develop feelings for a co-worker.

Dr. Grace Song launches her pilot program, giving the E.D. a technological facelift; as his health worsens, Archer clashes with Charles on a patient faking paralysis; Archer helps a pregnant mother with a heart condition.

A brutal storm rocks Chicago; Halstead encourages Dr. Grace Song to go against her own findings for the benefit of their patient; Asher rushes to the hospital to help Archer's pregnant patient; Maggie's concern for Ben consumes her.

A billionaire couple is found murdered in their home and Toronto's premier investigative reporter is on the case.

Goodwin and Charles clash as negotiations drag on between the administration and the custodial workers' union; Asher fights to keep a mother and her newborn baby together.

The hospital is in disarray when the janitors go on strike; Marcel treats a young girl injured on her family's farm; Charles and Cuevas' schizophrenic patient returns to Med; Archer encounters a patient with foreign material in her stomach.

Halstead and Cuevas struggle to diagnose a patient with a rare disorder; CFD and Med staff work to free a paranoid father trapped in the MRI suite; Tanaka-Reed gets an ego check.

A documentary crew visits Med to film Marcel and Abrams' groundbreaking surgery; Archer refuses to ask for help for his kidney issues despite the staff's unrelenting kindness; Halstead starts to develop feelings for a co-worker.

Dr. Grace Song launches her pilot program, giving the E.D. a technological facelift; as his health worsens, Archer clashes with Charles on a patient faking paralysis; Archer helps a pregnant mother with a heart condition.

A brutal storm rocks Chicago; Halstead encourages Dr. Grace Song to go against her own findings for the benefit of their patient; Asher rushes to the hospital to help Archer's pregnant patient; Maggie's concern for Ben consumes her.

A billionaire couple is found murdered in their home and Toronto's premier investigative reporter is on the case.

Two California men are at each other's throats over access to a disputed road, and things progress from intimidation and property damage to one of the most shocking murders the area has ever seen.

When an unidentified burned corpse is found in a field, state-of-the-art forensics is turned to.

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

Two California men are at each other's throats over access to a disputed road, and things progress from intimidation and property damage to one of the most shocking murders the area has ever seen.

When an unidentified burned corpse is found in a field, state-of-the-art forensics is turned to.

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

Two California men are at each other's throats over access to a disputed road, and things progress from intimidation and property damage to one of the most shocking murders the area has ever seen.

When an unidentified burned corpse is found in a field, state-of-the-art forensics is turned to.

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

The intelligence team works to find those responsible for Burgess' wounds; a search of the house provides valuable information.

Lindsay calls on Voight and his unit for help with her first case on the federal task force; Burgess is relegated to desk duty.

Ruzek's father (Jack Coleman) is first on the scene of a double murder; Lindsay prepares for an undercover investigation in Bolivia; Roman and Burgess try to move forward.

Antonio and his sister talk to Elliot Gish about the person they think is responsible for the fire that killed Shay; Lindsay has second thoughts about the task force; Platt's new, sunny demeanor results in curiosity.

Bunny comes to Lindsay with a concern that leads the team to a case that robbery-homicide has been investigating; Voight is suspicious of Bunny's motives.

When the magic door reroutes Charlie, Lysa and Connor to a bizarre manor where a series of Agatha Christie-style murders take place, they must figure out whodunit, while Vikram tries to track them down with the help of a mysterious tarot card reader.

Sophie's return to dating goes awry when her newest flame is a billionaire, swindling men and women to fund his lavish lifestyle; to dismantle his million dollar scheme, the team must create the perfect romantic specimen and bait the catfish.

Roman seeks owner Burton Greenberg's help with a landing spot for the cocaine; Zulio works with a corrupt banker to return Henao and Yolanda to the negotiating table; Nestor reveals a secret.

When an undercover narcotics officer goes missing, Antonio is asked to help find him; Burgess and Roman ask Mouch (Christian Stolte) for help with a squatter situation.

Lindsay calls on Voight and his unit for help with her first case on the federal task force; Burgess is relegated to desk duty.

Ruzek's father (Jack Coleman) is first on the scene of a double murder; Lindsay prepares for an undercover investigation in Bolivia; Roman and Burgess try to move forward.

Antonio and his sister talk to Elliot Gish about the person they think is responsible for the fire that killed Shay; Lindsay has second thoughts about the task force; Platt's new, sunny demeanor results in curiosity.

When the magic door reroutes Charlie, Lysa and Connor to a bizarre manor where a series of Agatha Christie-style murders take place, they must figure out whodunit, while Vikram tries to track them down with the help of a mysterious tarot card reader.

Sophie's return to dating goes awry when her newest flame is a billionaire, swindling men and women to fund his lavish lifestyle; to dismantle his million dollar scheme, the team must create the perfect romantic specimen and bait the catfish.

Roman seeks owner Burton Greenberg's help with a landing spot for the cocaine; Zulio works with a corrupt banker to return Henao and Yolanda to the negotiating table; Nestor reveals a secret.

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

Criminals are betrayed by the clues their own bodies leave behind.

Using technology to solve crime.

The members of intelligence go under cover at a World Trade conference to assess political threats; Halstead's brother immediately stirs up trouble when he shows up in town.

An investigation into a drug robbery gone wrong reveals Voight has ties to a teen linked to a double murder; Desk Sgt. Platt cares for a young girl.

A case involving one of Chicago's most wanted fugitives hits close to home with Olinsky; an altercation with another officer lands Sean Roman in hot water; Platt helps Nadia prepare for her polygraph test.

After arriving in Chicago to assist Voight and the team with a rape/murder case that has distinct similarities to a decade-old case from New York, Sgt. Benson asks Fin and Amaro to help; the prime suspect asks for a meeting with Lindsay.

Still struggling with a loss, the team must put feelings aside when a cafe is bombed; Atwater winds up in hot water after making a mistake.

A mass shooting takes place in an athletic club; Atwater deals with his new assignment; Halstead and Platt try to check up on Lindsay.

Voight and the team help retired Cmdr. Perry extract his nephew from a corrupt unit; Lindsay struggles to stay clean; a woman from Olinsky's past contacts him.

The members of intelligence go under cover at a World Trade conference to assess political threats; Halstead's brother immediately stirs up trouble when he shows up in town.

An investigation into a drug robbery gone wrong reveals Voight has ties to a teen linked to a double murder; Desk Sgt. Platt cares for a young girl.

A case involving one of Chicago's most wanted fugitives hits close to home with Olinsky; an altercation with another officer lands Sean Roman in hot water; Platt helps Nadia prepare for her polygraph test.

After arriving in Chicago to assist Voight and the team with a rape/murder case that has distinct similarities to a decade-old case from New York, Sgt. Benson asks Fin and Amaro to help; the prime suspect asks for a meeting with Lindsay.

Still struggling with a loss, the team must put feelings aside when a cafe is bombed; Atwater winds up in hot water after making a mistake.

A mass shooting takes place in an athletic club; Atwater deals with his new assignment; Halstead and Platt try to check up on Lindsay.

Voight and the team help retired Cmdr. Perry extract his nephew from a corrupt unit; Lindsay struggles to stay clean; a woman from Olinsky's past contacts him.

The members of intelligence go under cover at a World Trade conference to assess political threats; Halstead's brother immediately stirs up trouble when he shows up in town.

An investigation into a drug robbery gone wrong reveals Voight has ties to a teen linked to a double murder; Desk Sgt. Platt cares for a young girl.

A case involving one of Chicago's most wanted fugitives hits close to home with Olinsky; an altercation with another officer lands Sean Roman in hot water; Platt helps Nadia prepare for her polygraph test.

After arriving in Chicago to assist Voight and the team with a rape/murder case that has distinct similarities to a decade-old case from New York, Sgt. Benson asks Fin and Amaro to help; the prime suspect asks for a meeting with Lindsay.

Still struggling with a loss, the team must put feelings aside when a cafe is bombed; Atwater winds up in hot water after making a mistake.

A mass shooting takes place in an athletic club; Atwater deals with his new assignment; Halstead and Platt try to check up on Lindsay.

Voight and the team help retired Cmdr. Perry extract his nephew from a corrupt unit; Lindsay struggles to stay clean; a woman from Olinsky's past contacts him.

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.

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.

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.

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.

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.

Bereaved over the loss of their son, a couple is thrilled when a family with two boys moves in across the street; however, the relationship soon sours, engulfing all of them in a conflict that ends in a deadly shooting.

A serial rapist stalks elderly women for nearly 20 years before escalating to murder.

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

Bereaved over the loss of their son, a couple is thrilled when a family with two boys moves in across the street; however, the relationship soon sours, engulfing all of them in a conflict that ends in a deadly shooting.

A serial rapist stalks elderly women for nearly 20 years before escalating to murder.

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

Bereaved over the loss of their son, a couple is thrilled when a family with two boys moves in across the street; however, the relationship soon sours, engulfing all of them in a conflict that ends in a deadly shooting.

A serial rapist stalks elderly women for nearly 20 years before escalating to murder.

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

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.

Amid the increased threat on her daughter's life, Adilah reveals a secret to Imogen; Max must deal with the consequences of Emir's arrival in Paris.

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.

Amid the increased threat on her daughter's life, Adilah reveals a secret to Imogen; Max must deal with the consequences of Emir's arrival in Paris.

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.

An Appalachian couple is delighted when their neighbors return home after disappearing for 10 years, but they've changed for the worse, unleashing a campaign of endless intimidation and harassment that ultimately ends in a bloodbath.

A sniper targeting abortion doctors turns murderous and a DNA "needle in a haystack" identifies the gunman.

Team One attempts to contain a radioactive threat with the help of firefighters, paramedics and the military.

An Appalachian couple is delighted when their neighbors return home after disappearing for 10 years, but they've changed for the worse, unleashing a campaign of endless intimidation and harassment that ultimately ends in a bloodbath.

A sniper targeting abortion doctors turns murderous and a DNA "needle in a haystack" identifies the gunman.

Team One attempts to contain a radioactive threat with the help of firefighters, paramedics and the military.

An Appalachian couple is delighted when their neighbors return home after disappearing for 10 years, but they've changed for the worse, unleashing a campaign of endless intimidation and harassment that ultimately ends in a bloodbath.

A sniper targeting abortion doctors turns murderous and a DNA "needle in a haystack" identifies the gunman.

Team One attempts to contain a radioactive threat with the help of firefighters, paramedics and the military.

Maggie clashes with Charles over a patient who is distrustful of hospitals; Marcel and Halstead fight against Med's new policies to save their cancer patient; Asher and Archer pull surprising things out of their unsuspecting patients.

As Jack Dayton prepares to launch OR 2.0's IPO, Marcel and Grace search for data that may put a wrench in his plans; Charles helps a schizophrenic patient who is anxious about prom; Asher clashes with Abrams when his wife becomes her patient.

Shocking information threatens Jack Dayton's surgery and the future of OR 2.0; Archer goes rogue to save a patient in need; Maggie questions her future at Med.

An elevated train crash interrupts the grand opening of the emergency department when an influx of crash victims arrive at Chicago Med.

Ethan finds himself at odds with Natalie and Sharon when it comes to the treatment of a troubled teenager who's just given birth; Dr. Halstead treats a hypochondriac with an overbearing wife.