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.

Dr. Reese is contacted for help by a troubled teen in a psychiatric facility; Dr. Manning tries to help parents make a decision about their comatose daughter's surprise pregnancy; April begins to deal with repercussions from her personal life.

Doctors and nurses deal with a staff member's suicide; Choi and Halstead face off over how to treat a patient who is experiencing stroke symptoms; Manning treats a boy who fell into the river; Rhodes examines the man who saved Dr. Manning's patient.

Will confronts a moral decision when his former teacher faces a life-threatening disease; Rhodes disagrees with the father of a young patient about a risky procedure; an unusual case causes Sarah to recall Jason Wheeler's suicide.

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.

Dr. Reese is contacted for help by a troubled teen in a psychiatric facility; Dr. Manning tries to help parents make a decision about their comatose daughter's surprise pregnancy; April begins to deal with repercussions from her personal life.

Doctors and nurses deal with a staff member's suicide; Choi and Halstead face off over how to treat a patient who is experiencing stroke symptoms; Manning treats a boy who fell into the river; Rhodes examines the man who saved Dr. Manning's patient.

Will confronts a moral decision when his former teacher faces a life-threatening disease; Rhodes disagrees with the father of a young patient about a risky procedure; an unusual case causes Sarah to recall Jason Wheeler's suicide.

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.

An Army veteran delivers a parcel to his neighbor, but instead of receiving gratitude, he ignites a war between the two military men that spirals out of control, until the feud finally ends in a hail of bullets.

Andy faces a volatile gunman after a high-stakes takedown of a suspect does not go as planned.

Spike finds himself held at gunpoint; the team races to a shots-fired call.

An Army veteran delivers a parcel to his neighbor, but instead of receiving gratitude, he ignites a war between the two military men that spirals out of control, until the feud finally ends in a hail of bullets.

Andy faces a volatile gunman after a high-stakes takedown of a suspect does not go as planned.

Spike finds himself held at gunpoint; the team races to a shots-fired call.

An Army veteran delivers a parcel to his neighbor, but instead of receiving gratitude, he ignites a war between the two military men that spirals out of control, until the feud finally ends in a hail of bullets.

Andy faces a volatile gunman after a high-stakes takedown of a suspect does not go as planned.

Spike finds himself held at gunpoint; the team races to a shots-fired call.

The first responders race to rescue victims trapped in various tight spots; Athena contemplates accepting a promotion that will take her out of the field; Chimney finally deals with the aftermath of his near fatal car crash.

Maddie goes on a ride-along with Athena; Hen must figure out how to save her family from permanently falling apart; the first responders deal with emergencies both at a military funeral and a movie theater.

The first responders unwittingly become the subject of an eager reporter's first on-air assignment; Athena prepares for May's homecoming dance; the team responds to emergencies at an eating contest, a bodybuilding competition and a toddler pageant.

Halloween finds the first responders racing to the rescue at a cemetery, a haunted hayride and a spooky parade; Maddie thinks she has received a "ghost" call from a missing hiker; Hen is in a life-or-death situation with her father.

Buck jumps back into the dating scene but fears he will return to his old ways; a woman goes to great extremes on a freeway overpass to get the attention of her husband; a couple have a car accident on their wedding day.

Hen relives her evolution into the firefighter she is today as she recalls the first times she met Chimney and Athena.

During the holidays, the first responders must deal with a stampede at a toy store, a mistletoe stunt gone awry and neighbors competing in a Christmas light showdown; Bobby contemplates his future with Athena; Chimney and Buck try to help Maddie.

The first responders race to rescue victims trapped in various tight spots; Athena contemplates accepting a promotion that will take her out of the field; Chimney finally deals with the aftermath of his near fatal car crash.

Maddie goes on a ride-along with Athena; Hen must figure out how to save her family from permanently falling apart; the first responders deal with emergencies both at a military funeral and a movie theater.

The first responders unwittingly become the subject of an eager reporter's first on-air assignment; Athena prepares for May's homecoming dance; the team responds to emergencies at an eating contest, a bodybuilding competition and a toddler pageant.

Halloween finds the first responders racing to the rescue at a cemetery, a haunted hayride and a spooky parade; Maddie thinks she has received a "ghost" call from a missing hiker; Hen is in a life-or-death situation with her father.

Buck jumps back into the dating scene but fears he will return to his old ways; a woman goes to great extremes on a freeway overpass to get the attention of her husband; a couple have a car accident on their wedding day.

Hen relives her evolution into the firefighter she is today as she recalls the first times she met Chimney and Athena.

During the holidays, the first responders must deal with a stampede at a toy store, a mistletoe stunt gone awry and neighbors competing in a Christmas light showdown; Bobby contemplates his future with Athena; Chimney and Buck try to help Maddie.

The first responders race to rescue victims trapped in various tight spots; Athena contemplates accepting a promotion that will take her out of the field; Chimney finally deals with the aftermath of his near fatal car crash.

The unofficial mayor of an idyllic suburban street locks horns with the new neighbor who shows no respect for local values; disagreements escalate to arguments, threats, and property damage, ending in brutal violence that shatters two families.

The rookies hunt for a violent escaped convict; Andy and her training officer search for a missing informant.

Parker is confronted with devastating news; an explosion traps Jules.

The unofficial mayor of an idyllic suburban street locks horns with the new neighbor who shows no respect for local values; disagreements escalate to arguments, threats, and property damage, ending in brutal violence that shatters two families.

The rookies hunt for a violent escaped convict; Andy and her training officer search for a missing informant.

Parker is confronted with devastating news; an explosion traps Jules.

The unofficial mayor of an idyllic suburban street locks horns with the new neighbor who shows no respect for local values; disagreements escalate to arguments, threats, and property damage, ending in brutal violence that shatters two families.

The rookies hunt for a violent escaped convict; Andy and her training officer search for a missing informant.

Parker is confronted with devastating news; an explosion traps Jules.

Will and Natalie battle for their lives after a car accident; an investigation is launched following the suspicious death of Cornelius Rhodes; Maggie receives life-changing news; Dr. Charles cuts his honeymoon short to tend to a patient.

A power outage at Med puts multiple patients at risk and tests the skills of the staff and their enthusiastic med students; Natalie returns following her traumatic brain injury; Ethan and April wonder if a family is in their future.

Dr. Choi and Dr. Charles have difficult decisions to make as a dying man tries to preserve his life with a controversial scientific method; Dr. Marcel and April clash over how to handle a mysterious patient; Will questions Natalie's capabilities.

An entire apartment complex is forced into quarantine when cases of a deadly virus turn into an epidemic; P.D. chases a lead that could point to a case of bioterrorism, and Will gets dangerously close to the suspect.

Dr. Choi and Dr. Marcel don't see eye to eye over the treatment of a patient's chronic pain; rumors circulate about Maggie; Dr. Manning works to help a young boy, but she is challenged by his parents, who believe in only using holistic remedies.

Dr. Manning's actions with a recent patient lead to serious repercussions; April and Noah disagree over a patient who is injured after a beating; Dr. Charles is visited by a childhood friend.

Dr. Charles and Dr. Halstead sink their teeth into a bloodthirsty case; Dr. Marcel and Maggie throw a traditional crawfish boil for the staff; a new relationship blossoms while another is left on rocky ground.

Will and Natalie battle for their lives after a car accident; an investigation is launched following the suspicious death of Cornelius Rhodes; Maggie receives life-changing news; Dr. Charles cuts his honeymoon short to tend to a patient.

A power outage at Med puts multiple patients at risk and tests the skills of the staff and their enthusiastic med students; Natalie returns following her traumatic brain injury; Ethan and April wonder if a family is in their future.

Dr. Choi and Dr. Charles have difficult decisions to make as a dying man tries to preserve his life with a controversial scientific method; Dr. Marcel and April clash over how to handle a mysterious patient; Will questions Natalie's capabilities.

An entire apartment complex is forced into quarantine when cases of a deadly virus turn into an epidemic; P.D. chases a lead that could point to a case of bioterrorism, and Will gets dangerously close to the suspect.

Dr. Choi and Dr. Marcel don't see eye to eye over the treatment of a patient's chronic pain; rumors circulate about Maggie; Dr. Manning works to help a young boy, but she is challenged by his parents, who believe in only using holistic remedies.

Dr. Manning's actions with a recent patient lead to serious repercussions; April and Noah disagree over a patient who is injured after a beating; Dr. Charles is visited by a childhood friend.

Dr. Charles and Dr. Halstead sink their teeth into a bloodthirsty case; Dr. Marcel and Maggie throw a traditional crawfish boil for the staff; a new relationship blossoms while another is left on rocky ground.

Will and Natalie battle for their lives after a car accident; an investigation is launched following the suspicious death of Cornelius Rhodes; Maggie receives life-changing news; Dr. Charles cuts his honeymoon short to tend to a patient.

The mountain road between them fails to keep two long-time neighbors from tormenting each other; seemingly small events bring their decadeslong hostility to a bloody boil, and property lines become battle lines in a fight to the death.

Andy wrestles with a dilemma, while the other rookies are ready to duke it out at a charity event.

A firefighter is rushed to the hospital; Simon is forced to make a choice.

The mountain road between them fails to keep two long-time neighbors from tormenting each other; seemingly small events bring their decadeslong hostility to a bloody boil, and property lines become battle lines in a fight to the death.

Andy wrestles with a dilemma, while the other rookies are ready to duke it out at a charity event.

A firefighter is rushed to the hospital; Simon is forced to make a choice.

The mountain road between them fails to keep two long-time neighbors from tormenting each other; seemingly small events bring their decadeslong hostility to a bloody boil, and property lines become battle lines in a fight to the death.

Andy wrestles with a dilemma, while the other rookies are ready to duke it out at a charity event.

A firefighter is rushed to the hospital; Simon is forced to make a choice.

When Burgess realizes that her sister, Nicole, never made it home after a night out with friends, the members of the intelligence team make finding Nicole their top priority.

The murder weapon in the killing of a teenage boy is linked to a case Voight worked on 17 years ago; the victim's father wants Area Central Homicide to take the case.

Intelligence investigates armed bank robberies, which point to some surprising suspects; Lindsay is forced to make a decision in the heat of the moment.

A vigilante posts a video online of a man, previously locked up for statutory rape, being beaten and burned alive; Lindsay encounters some personal and professional problems.

Lindsay's mother, Bunny, becomes a murder suspect when her boyfriend is shot; high school students overdose on drugs; Lindsay finds herself up against the review board.

The 126 race to save a man crushed under a vending machine; Owen finally faces the truth of his brother's death; Tommy is concerned that Nancy may be facing a possible health scare.

Reenie gets Colter to take a case involving a woman missing from a high-end wellness retreat.

When a wealthy family charters The Odyssey for a weeklong wedding cruise, all eyes are on the "bridezilla" as she wreaks havoc; love and lust manage to find their way through the air with sparks flying among the crew.

The murder weapon in the killing of a teenage boy is linked to a case Voight worked on 17 years ago; the victim's father wants Area Central Homicide to take the case.

Intelligence investigates armed bank robberies, which point to some surprising suspects; Lindsay is forced to make a decision in the heat of the moment.

A vigilante posts a video online of a man, previously locked up for statutory rape, being beaten and burned alive; Lindsay encounters some personal and professional problems.

Lindsay's mother, Bunny, becomes a murder suspect when her boyfriend is shot; high school students overdose on drugs; Lindsay finds herself up against the review board.

The 126 race to save a man crushed under a vending machine; Owen finally faces the truth of his brother's death; Tommy is concerned that Nancy may be facing a possible health scare.

Reenie gets Colter to take a case involving a woman missing from a high-end wellness retreat.

When a wealthy family charters The Odyssey for a weeklong wedding cruise, all eyes are on the "bridezilla" as she wreaks havoc; love and lust manage to find their way through the air with sparks flying among the crew.

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

Using technology to solve crime.

Murder weapons often hold several critical forensic clues about the crime.

The investigation into a murder of an illegal immigrant is hampered by the perception of police among the city's immigrant population.

The investigation into a drug-related homicide is hampered by the neighborhood's no-snitch culture; Upton is asked about Ruzek's rough altercation with a suspect.

A meth lab bust uncovers a scam in which children adopted from foreign countries are abandoned, then sold online; Atwater struggles with decisions about moving his siblings to a safer environment.

A family is killed, and the team searches for a drug dealer with a likely connection; Voight asks Vice Sgt. Sean McGrady for help.

Halstead goes under cover to stop an ex-military kidnapping crew from killing an innocent child.

When one of Voight's friends is found passed out in his hotel room with a dead Ukranian girl, Intelligence discovers the murder is connected to a sting and Burgess' boyfriend.

The death of Judge Tommy Wells' daughter puts Intelligence on the track of a pill mill spreading into the suburbs of Chicago and the doctor enabling it; Voight discovers who's been leaking information from the 21st.

The investigation into a murder of an illegal immigrant is hampered by the perception of police among the city's immigrant population.

The investigation into a drug-related homicide is hampered by the neighborhood's no-snitch culture; Upton is asked about Ruzek's rough altercation with a suspect.

A meth lab bust uncovers a scam in which children adopted from foreign countries are abandoned, then sold online; Atwater struggles with decisions about moving his siblings to a safer environment.

A family is killed, and the team searches for a drug dealer with a likely connection; Voight asks Vice Sgt. Sean McGrady for help.

Halstead goes under cover to stop an ex-military kidnapping crew from killing an innocent child.

When one of Voight's friends is found passed out in his hotel room with a dead Ukranian girl, Intelligence discovers the murder is connected to a sting and Burgess' boyfriend.

The death of Judge Tommy Wells' daughter puts Intelligence on the track of a pill mill spreading into the suburbs of Chicago and the doctor enabling it; Voight discovers who's been leaking information from the 21st.

The investigation into a murder of an illegal immigrant is hampered by the perception of police among the city's immigrant population.

The investigation into a drug-related homicide is hampered by the neighborhood's no-snitch culture; Upton is asked about Ruzek's rough altercation with a suspect.

A meth lab bust uncovers a scam in which children adopted from foreign countries are abandoned, then sold online; Atwater struggles with decisions about moving his siblings to a safer environment.

A family is killed, and the team searches for a drug dealer with a likely connection; Voight asks Vice Sgt. Sean McGrady for help.

Halstead goes under cover to stop an ex-military kidnapping crew from killing an innocent child.

When one of Voight's friends is found passed out in his hotel room with a dead Ukranian girl, Intelligence discovers the murder is connected to a sting and Burgess' boyfriend.

The death of Judge Tommy Wells' daughter puts Intelligence on the track of a pill mill spreading into the suburbs of Chicago and the doctor enabling it; Voight discovers who's been leaking information from the 21st.

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.

An apartment-dwelling family finds their peace and quiet shattered when a loud neighbor moves into the unit directly overhead; the conflict engulfs both sides resulting in flying fists, drawn weapons, and a man left bleeding out in the hallway.

Andy goes under cover as a prostitute during a citywide sting operation; Dov and Andy's attempt to impress Sgt. Boyko backfires.

Team One is in pursuit of James Mitchell, an armed man hunting for his ex-wife.

An apartment-dwelling family finds their peace and quiet shattered when a loud neighbor moves into the unit directly overhead; the conflict engulfs both sides resulting in flying fists, drawn weapons, and a man left bleeding out in the hallway.

Andy goes under cover as a prostitute during a citywide sting operation; Dov and Andy's attempt to impress Sgt. Boyko backfires.

Team One is in pursuit of James Mitchell, an armed man hunting for his ex-wife.

An apartment-dwelling family finds their peace and quiet shattered when a loud neighbor moves into the unit directly overhead; the conflict engulfs both sides resulting in flying fists, drawn weapons, and a man left bleeding out in the hallway.

Andy goes under cover as a prostitute during a citywide sting operation; Dov and Andy's attempt to impress Sgt. Boyko backfires.

Team One is in pursuit of James Mitchell, an armed man hunting for his ex-wife.

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.

With Jacob Pearce's plan in motion, and the bomb's detonation imminent, Zara, Vincent and Juliette fear they must surrender to his ultimatum; but the time is against them and Pearce is hellbent on revenge; they must save Paris.

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.

With Jacob Pearce's plan in motion, and the bomb's detonation imminent, Zara, Vincent and Juliette fear they must surrender to his ultimatum; but the time is against them and Pearce is hellbent on revenge; they must save Paris.

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 long-time resident of a suburban street descends into a morass of delusion, anger and paranoia that turns him against innocent neighbors; he eventually becomes wholly unhinged and unleashes his violent wrath upon his small Baltimore community.

Andy and Traci are among the first responders to a home invasion at an upscale address; when the crisis appears to be over, Traci hurries away to handle a personal emergency; Andy must confront the armed suspect alone.

An abduction at a doctor's office leads to the team facing a desperate felon.

A long-time resident of a suburban street descends into a morass of delusion, anger and paranoia that turns him against innocent neighbors; he eventually becomes wholly unhinged and unleashes his violent wrath upon his small Baltimore community.

Andy and Traci are among the first responders to a home invasion at an upscale address; when the crisis appears to be over, Traci hurries away to handle a personal emergency; Andy must confront the armed suspect alone.

An abduction at a doctor's office leads to the team facing a desperate felon.

A long-time resident of a suburban street descends into a morass of delusion, anger and paranoia that turns him against innocent neighbors; he eventually becomes wholly unhinged and unleashes his violent wrath upon his small Baltimore community.

Andy and Traci are among the first responders to a home invasion at an upscale address; when the crisis appears to be over, Traci hurries away to handle a personal emergency; Andy must confront the armed suspect alone.

An abduction at a doctor's office leads to the team facing a desperate felon.

Maggie gets unsettling news about a new friend and breaks protocol to support him; one of the doctors from the Med family is rushed into emergency surgery after a violent assault; a social media influencer lets his users vote on medical advice.

April receives unfortunate news that makes her question her future with Ethan; Dr. Charles and Maggie see tough times on the horizon; Natalie's memory from the accident starts to return.

Dr. Halstead's world is thrown into turmoil when a former patient resurfaces; April has a secret she considers confessing to Ethan; Dr. Charles tries to maintain his focus during a difficult time.

After a major accident at O'Hare, the E.D. is concerned one of their own is in mortal danger; Will's proposal for a safe injection site goes to the board for consideration; Natalie and Goodwin become concerned for Gwen.

The team deals with the aftermath of a school bus crash; Dr. Charles worries Dr. Halstead is putting his medical license in jeopardy; Maggie helps a friend in need.

Two brothers in critical condition are rushed into the hospital by their parents, leaving Dr. Choi, April and Dr. Charles to piece together what actually transpired; Dr. Manning becomes suspicious of a new mother entering the E.D.

Dr. Manning and Dr. Marcel disagree over an abusive husband; Dr. Halstead struggles with ethics and his decision to work at the safe injection site; Dr. Charles and Elsa reveal a misdiagnosis that may change a family's life.

Maggie gets unsettling news about a new friend and breaks protocol to support him; one of the doctors from the Med family is rushed into emergency surgery after a violent assault; a social media influencer lets his users vote on medical advice.

April receives unfortunate news that makes her question her future with Ethan; Dr. Charles and Maggie see tough times on the horizon; Natalie's memory from the accident starts to return.

Dr. Halstead's world is thrown into turmoil when a former patient resurfaces; April has a secret she considers confessing to Ethan; Dr. Charles tries to maintain his focus during a difficult time.

After a major accident at O'Hare, the E.D. is concerned one of their own is in mortal danger; Will's proposal for a safe injection site goes to the board for consideration; Natalie and Goodwin become concerned for Gwen.

The team deals with the aftermath of a school bus crash; Dr. Charles worries Dr. Halstead is putting his medical license in jeopardy; Maggie helps a friend in need.

Two brothers in critical condition are rushed into the hospital by their parents, leaving Dr. Choi, April and Dr. Charles to piece together what actually transpired; Dr. Manning becomes suspicious of a new mother entering the E.D.

Dr. Manning and Dr. Marcel disagree over an abusive husband; Dr. Halstead struggles with ethics and his decision to work at the safe injection site; Dr. Charles and Elsa reveal a misdiagnosis that may change a family's life.

Maggie gets unsettling news about a new friend and breaks protocol to support him; one of the doctors from the Med family is rushed into emergency surgery after a violent assault; a social media influencer lets his users vote on medical advice.

A friendly retired couple delights a family with young children when they move in next door. Then the new neighbors' dog attacks the children's mother, setting off a vicious conflict that ends in two shocking murders.

The investigation into a fatal traffic accident leads to the discovery of a darker crime; Andy objects to how Luke handles a young murder witness.

Team One discovers two young con artists who have ties to Pete Joris at a bank robbery.

A friendly retired couple delights a family with young children when they move in next door. Then the new neighbors' dog attacks the children's mother, setting off a vicious conflict that ends in two shocking murders.

The investigation into a fatal traffic accident leads to the discovery of a darker crime; Andy objects to how Luke handles a young murder witness.

Team One discovers two young con artists who have ties to Pete Joris at a bank robbery.

A friendly retired couple delights a family with young children when they move in next door. Then the new neighbors' dog attacks the children's mother, setting off a vicious conflict that ends in two shocking murders.

The investigation into a fatal traffic accident leads to the discovery of a darker crime; Andy objects to how Luke handles a young murder witness.

Team One discovers two young con artists who have ties to Pete Joris at a bank robbery.

Bobby meets Athena's parents for the first time; Maddie attempts to end her marriage for good, causing Doug to insinuate himself even deeper into Chimney's life.

Looking back at how Chimney joined Station 118 and became the firefighter and paramedic he is today.

The first responders rally together to search for a missing Maddie.

The call center is hit with a system-wide power outage and must go old school to respond to emergencies; the first responders must deal with explosions in multiple homes and a difficult child birth; Michael confronts Bobby about parenting his kids.