An Indonesian man who doesn't speak English arrives at the hospital with a mysterious illness; Dr. Halstead attends Maggie's family reunion; Dr. Rhodes accepts a complicated heart surgery without consulting Dr. Latham.

The 118 springs into action when a citywide blackout and a record heat wave causes mayhem in Los Angeles; Chimney confides in Hen about Maddie's condition; Athena's worst nightmare comes true.

As Jim plots to take down a corrupt cop, Nina uncovers buried FBI secrets; a shadowy figure in D.C. watches her every move.

The 118 responds to calls dealing with parents and their children, including a disastrous birthday party thrown by a mommy blogger; Athena and Michael talk to May about her past suicide attempt; Chimney and Maddie adjust to life with their newborn.

Daily gossip and celebrity news from home and abroad; roving reporters and Hollywood correspondents provide must-have details on scoops.

In Elyria, Ohio, two neighboring families live in harmony for decades, then their friendly coexistence devolves into acrimony, accusations and violence.

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

When Jules finds herself in the middle of a hostage situation at a restaurant, the SRUs are brought in to take care of the gunman, who believes the establishment's owner is a terrorist.

In Elyria, Ohio, two neighboring families live in harmony for decades, then their friendly coexistence devolves into acrimony, accusations and violence.

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

When Jules finds herself in the middle of a hostage situation at a restaurant, the SRUs are brought in to take care of the gunman, who believes the establishment's owner is a terrorist.

In Elyria, Ohio, two neighboring families live in harmony for decades, then their friendly coexistence devolves into acrimony, accusations and violence.

When Jules finds herself in the middle of a hostage situation at a restaurant, the SRUs are brought in to take care of the gunman, who believes the establishment's owner is a terrorist.

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

The 118 responds to calls dealing with parents and their children, including a disastrous birthday party thrown by a mommy blogger; Athena and Michael talk to May about her past suicide attempt; Chimney and Maddie adjust to life with their newborn.

A car crash at the Chicago Marathon leaves victims in critical condition; April and her medical resident brother must perform an intense operation in the field; an 8-year-old girl experiences sudden hearing loss; Dr. Choi treats a malnourished woman.

The members of the 118 rush to the site of a hit-and-run that leaves a familiar face in critical condition; with Buck's help, Athena investigates the case of a missing woman; Josh recalls an emergency in 2006 that led him to become a first responder.

A young cancer patient struggles to tell her parents about her condition; Dr. Reese turns to Dr. Charles and Detective Lindsay for help with a troubled young man; a teen science geek and her friends impress Dr. Choi and Natalie.

When a famous mystery writer dies, Athena, Bobby and the 118 respond to the chaos caused by a citywide manhunt for buried treasure the author left behind.

Goodwin reunites with her childhood sweetheart; Dr. Halstead gets lured into a concierge doctor app idea; Dr. Rhodes treats a woman with a heart infection against the advice of Dr. Charles; a former patient of Reese's reaches out for help.

The members of the 118 make calls to save a bridezilla at a disastrous wedding; Hen plays medical detective when her mother falls ill; Eddie and Christopher receive a visit from Carla; Athena uncovers a secret Bobby has been hiding.

Halstead and Manning deal with two feuding brothers, one of which is in dire need of a kidney; a patient of Dr. Reese's comes to a crossroad; a 16-year-old with a genetic condition needs surgery, but the overprotective mother gets in the way.

Athena and the 118 are on high alert when a sniper is targeting members of the LAFD; Maddie makes a life decision.

Dr. Charles is tasked with evaluating a patient as a possible heart recipient; Jeff makes a confession to Dr. Manning; two MMA fighters arrive at Chicago Med in bad shape; Dr. Stohl returns from his sabbatical.

A series of ransomware threats leads to emergencies for the 118, including a helicopter crash at a hospital and an air traffic control tower system failure; the case of the realtor serial rapist goes to trial.

A heart transplant patient gets into a car accident, revealing issues that could complicate her surgery; the police officer who arrested Maggie is brought to Chicago Med with a serious injury.

The 118 springs into action when a citywide blackout and a record heat wave causes mayhem in Los Angeles; Chimney confides in Hen about Maddie's condition; Athena's worst nightmare comes true.

A 19-year-old Colorado media major disappears after a night on the town.

The 118 responds to calls dealing with parents and their children, including a disastrous birthday party thrown by a mommy blogger; Athena and Michael talk to May about her past suicide attempt; Chimney and Maddie adjust to life with their newborn.

Advances in DNA science solve the 40-year cold case of a student's murder.

The members of the 118 rush to the site of a hit-and-run that leaves a familiar face in critical condition; with Buck's help, Athena investigates the case of a missing woman; Josh recalls an emergency in 2006 that led him to become a first responder.

A young cancer patient struggles to tell her parents about her condition; Dr. Reese turns to Dr. Charles and Detective Lindsay for help with a troubled young man; a teen science geek and her friends impress Dr. Choi and Natalie.

When a famous mystery writer dies, Athena, Bobby and the 118 respond to the chaos caused by a citywide manhunt for buried treasure the author left behind.

Goodwin reunites with her childhood sweetheart; Dr. Halstead gets lured into a concierge doctor app idea; Dr. Rhodes treats a woman with a heart infection against the advice of Dr. Charles; a former patient of Reese's reaches out for help.

The members of the 118 make calls to save a bridezilla at a disastrous wedding; Hen plays medical detective when her mother falls ill; Eddie and Christopher receive a visit from Carla; Athena uncovers a secret Bobby has been hiding.

Halstead and Manning deal with two feuding brothers, one of which is in dire need of a kidney; a patient of Dr. Reese's comes to a crossroad; a 16-year-old with a genetic condition needs surgery, but the overprotective mother gets in the way.

Athena and the 118 are on high alert when a sniper is targeting members of the LAFD; Maddie makes a life decision.

Dr. Charles is tasked with evaluating a patient as a possible heart recipient; Jeff makes a confession to Dr. Manning; two MMA fighters arrive at Chicago Med in bad shape; Dr. Stohl returns from his sabbatical.

A series of ransomware threats leads to emergencies for the 118, including a helicopter crash at a hospital and an air traffic control tower system failure; the case of the realtor serial rapist goes to trial.

A heart transplant patient gets into a car accident, revealing issues that could complicate her surgery; the police officer who arrested Maggie is brought to Chicago Med with a serious injury.

The 118 springs into action when a citywide blackout and a record heat wave causes mayhem in Los Angeles; Chimney confides in Hen about Maddie's condition; Athena's worst nightmare comes true.

A 19-year-old Colorado media major disappears after a night on the town.

The 118 responds to calls dealing with parents and their children, including a disastrous birthday party thrown by a mommy blogger; Athena and Michael talk to May about her past suicide attempt; Chimney and Maddie adjust to life with their newborn.

Advances in DNA science solve the 40-year cold case of a student's murder.

When family members fall ill from deadly poison found in their soda, investigators turn their attention to the quiet couple who live next door.

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 botched plan leads to a crime boss escaping with his girlfriend, who works for the team as an informant.

When family members fall ill from deadly poison found in their soda, investigators turn their attention to the quiet couple who live next door.

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 botched plan leads to a crime boss escaping with his girlfriend, who works for the team as an informant.

When family members fall ill from deadly poison found in their soda, investigators turn their attention to the quiet couple who live next door.

A botched plan leads to a crime boss escaping with his girlfriend, who works for the team as an informant.

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.

Officers Nolan, Chen and West are squeezed harder than ever before as their training officers evaluate whether they are truly ready for the job; one of the rookie classmates is involved in a shooting.

A car crash at the Chicago Marathon leaves victims in critical condition; April and her medical resident brother must perform an intense operation in the field; an 8-year-old girl experiences sudden hearing loss; Dr. Choi treats a malnourished woman.

Nolan's discovery goes much deeper than he expected and could put his life and career in jeopardy.

A young cancer patient struggles to tell her parents about her condition; Dr. Reese turns to Dr. Charles and Detective Lindsay for help with a troubled young man; a teen science geek and her friends impress Dr. Choi and Natalie.

Goodwin reunites with her childhood sweetheart; Dr. Halstead gets lured into a concierge doctor app idea; Dr. Rhodes treats a woman with a heart infection against the advice of Dr. Charles; a former patient of Reese's reaches out for help.

Nearing the end of his training, Nolan faces his biggest challenge as a police officer yet when he must come to terms with the choices he has made in pursuit of the truth.

Halstead and Manning deal with two feuding brothers, one of which is in dire need of a kidney; a patient of Dr. Reese's comes to a crossroad; a 16-year-old with a genetic condition needs surgery, but the overprotective mother gets in the way.

Officer John Nolan and Officer Nyla Harper are assigned to a community policing center in an attempt to rebuild their station's reputation in the community.

Dr. Charles is tasked with evaluating a patient as a possible heart recipient; Jeff makes a confession to Dr. Manning; two MMA fighters arrive at Chicago Med in bad shape; Dr. Stohl returns from his sabbatical.

Officer John Nolan's mom makes an unannounced visit, which complicates his life; Sgt. Grey considers retiring.

A heart transplant patient gets into a car accident, revealing issues that could complicate her surgery; the police officer who arrested Maggie is brought to Chicago Med with a serious injury.

Officer Jackson West's relationship with his new training officer, Stanton, escalates, and he begins to work with Sgt. Grey to find a solution.

A 19-year-old Colorado media major disappears after a night on the town.

Officer Nolan is taken hostage by a man with nothing to lose; Officer Jackson and his training officer, Officer Doug Stanton, reach a tipping point in their relationship that could end Jackson's career.

Advances in DNA science solve the 40-year cold case of a student's murder.

Officers Nolan, Chen and West are squeezed harder than ever before as their training officers evaluate whether they are truly ready for the job; one of the rookie classmates is involved in a shooting.

A young cancer patient struggles to tell her parents about her condition; Dr. Reese turns to Dr. Charles and Detective Lindsay for help with a troubled young man; a teen science geek and her friends impress Dr. Choi and Natalie.

Nolan's discovery goes much deeper than he expected and could put his life and career in jeopardy.

Goodwin reunites with her childhood sweetheart; Dr. Halstead gets lured into a concierge doctor app idea; Dr. Rhodes treats a woman with a heart infection against the advice of Dr. Charles; a former patient of Reese's reaches out for help.

Nearing the end of his training, Nolan faces his biggest challenge as a police officer yet when he must come to terms with the choices he has made in pursuit of the truth.

Halstead and Manning deal with two feuding brothers, one of which is in dire need of a kidney; a patient of Dr. Reese's comes to a crossroad; a 16-year-old with a genetic condition needs surgery, but the overprotective mother gets in the way.

Officer John Nolan and Officer Nyla Harper are assigned to a community policing center in an attempt to rebuild their station's reputation in the community.

Dr. Charles is tasked with evaluating a patient as a possible heart recipient; Jeff makes a confession to Dr. Manning; two MMA fighters arrive at Chicago Med in bad shape; Dr. Stohl returns from his sabbatical.

Officer John Nolan's mom makes an unannounced visit, which complicates his life; Sgt. Grey considers retiring.

A heart transplant patient gets into a car accident, revealing issues that could complicate her surgery; the police officer who arrested Maggie is brought to Chicago Med with a serious injury.

Officer Jackson West's relationship with his new training officer, Stanton, escalates, and he begins to work with Sgt. Grey to find a solution.

A 19-year-old Colorado media major disappears after a night on the town.

Officer Nolan is taken hostage by a man with nothing to lose; Officer Jackson and his training officer, Officer Doug Stanton, reach a tipping point in their relationship that could end Jackson's career.

Advances in DNA science solve the 40-year cold case of a student's murder.

Officers Nolan, Chen and West are squeezed harder than ever before as their training officers evaluate whether they are truly ready for the job; one of the rookie classmates is involved in a shooting.

A couple moves to an idyllic California beach town and hits it off with their new neighbors, then one of the wives descends into drugs and madness, terrorizing the other.

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

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

Team One members must undergo intense psychological testing; Ed, on his way to the hospital for the birth of his child, gets shot.

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

A couple moves to an idyllic California beach town and hits it off with their new neighbors, then one of the wives descends into drugs and madness, terrorizing the other.

The team works with a visiting detective to put an end to a gang's brutal tactics; Antonio learns that the detective has a hidden motive for being in Chicago; Voight learns that the body of his son's killer has been found.

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

A basketball star is found murdered after an anti-police rally; a politically charged environment must be navigated while tracking down the killer; complicating matters further, Woods' daughter Brianna is tangled up in the case.

Team One members must undergo intense psychological testing; Ed, on his way to the hospital for the birth of his child, gets shot.

Intelligence tracks down a vigilante who is killing rapists; Burgess begins to question if the men who attacked her sister truly paid for their actions.

A couple moves to an idyllic California beach town and hits it off with their new neighbors, then one of the wives descends into drugs and madness, terrorizing the other.

A string of bombings is targeting members of the media; the team enlists firehouse 51 to help examine the devices and prevent the next attack.

When a prominent alderman who is known for his urban revitalization efforts is killed, Intelligence looks into the corruption haunting his neighborhood; Olinsky feels pressure after receiving an ultimatum from Woods.

Team One members must undergo intense psychological testing; Ed, on his way to the hospital for the birth of his child, gets shot.

Upton brings back an old undercover identity to help take down a meth ring spearheaded by a former contact; with pressure from Woods mounting, Voight calls in a favor for Olinsky.

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

A string of robberies leads back to an unlikely individual; Voight confronts a key witness in the Bingham investigation.

Officers Nolan, Chen and West are squeezed harder than ever before as their training officers evaluate whether they are truly ready for the job; one of the rookie classmates is involved in a shooting.

The team works with a visiting detective to put an end to a gang's brutal tactics; Antonio learns that the detective has a hidden motive for being in Chicago; Voight learns that the body of his son's killer has been found.

Nolan's discovery goes much deeper than he expected and could put his life and career in jeopardy.

A basketball star is found murdered after an anti-police rally; a politically charged environment must be navigated while tracking down the killer; complicating matters further, Woods' daughter Brianna is tangled up in the case.

Nearing the end of his training, Nolan faces his biggest challenge as a police officer yet when he must come to terms with the choices he has made in pursuit of the truth.

Intelligence tracks down a vigilante who is killing rapists; Burgess begins to question if the men who attacked her sister truly paid for their actions.

Officer John Nolan and Officer Nyla Harper are assigned to a community policing center in an attempt to rebuild their station's reputation in the community.

A string of bombings is targeting members of the media; the team enlists firehouse 51 to help examine the devices and prevent the next attack.

Officer John Nolan's mom makes an unannounced visit, which complicates his life; Sgt. Grey considers retiring.

When a prominent alderman who is known for his urban revitalization efforts is killed, Intelligence looks into the corruption haunting his neighborhood; Olinsky feels pressure after receiving an ultimatum from Woods.

Officer Jackson West's relationship with his new training officer, Stanton, escalates, and he begins to work with Sgt. Grey to find a solution.

A 19-year-old Colorado media major disappears after a night on the town.

Officer Nolan is taken hostage by a man with nothing to lose; Officer Jackson and his training officer, Officer Doug Stanton, reach a tipping point in their relationship that could end Jackson's career.

Advances in DNA science solve the 40-year cold case of a student's murder.

Officers Nolan, Chen and West are squeezed harder than ever before as their training officers evaluate whether they are truly ready for the job; one of the rookie classmates is involved in a shooting.

The team works with a visiting detective to put an end to a gang's brutal tactics; Antonio learns that the detective has a hidden motive for being in Chicago; Voight learns that the body of his son's killer has been found.

Nolan's discovery goes much deeper than he expected and could put his life and career in jeopardy.

A basketball star is found murdered after an anti-police rally; a politically charged environment must be navigated while tracking down the killer; complicating matters further, Woods' daughter Brianna is tangled up in the case.

Nearing the end of his training, Nolan faces his biggest challenge as a police officer yet when he must come to terms with the choices he has made in pursuit of the truth.

Intelligence tracks down a vigilante who is killing rapists; Burgess begins to question if the men who attacked her sister truly paid for their actions.

Officer John Nolan and Officer Nyla Harper are assigned to a community policing center in an attempt to rebuild their station's reputation in the community.

A string of bombings is targeting members of the media; the team enlists firehouse 51 to help examine the devices and prevent the next attack.

Officer John Nolan's mom makes an unannounced visit, which complicates his life; Sgt. Grey considers retiring.

Officer Jackson West's relationship with his new training officer, Stanton, escalates, and he begins to work with Sgt. Grey to find a solution.

When a prominent alderman who is known for his urban revitalization efforts is killed, Intelligence looks into the corruption haunting his neighborhood; Olinsky feels pressure after receiving an ultimatum from Woods.

Officer Nolan is taken hostage by a man with nothing to lose; Officer Jackson and his training officer, Officer Doug Stanton, reach a tipping point in their relationship that could end Jackson's career.

Upton brings back an old undercover identity to help take down a meth ring spearheaded by a former contact; with pressure from Woods mounting, Voight calls in a favor for Olinsky.

Officers Nolan, Chen and West are squeezed harder than ever before as their training officers evaluate whether they are truly ready for the job; one of the rookie classmates is involved in a shooting.

A string of robberies leads back to an unlikely individual; Voight confronts a key witness in the Bingham investigation.

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

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

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

The team works with a visiting detective to put an end to a gang's brutal tactics; Antonio learns that the detective has a hidden motive for being in Chicago; Voight learns that the body of his son's killer has been found.

Herrmann is tormented by a difficult decision; Casey is thrown into the spotlight at a fundraiser; Dawson and Brett are faced with the repercussions of their actions; Severide helps with a case regarding homemade explosives; Otis is surprised.

A basketball star is found murdered after an anti-police rally; a politically charged environment must be navigated while tracking down the killer; complicating matters further, Woods' daughter Brianna is tangled up in the case.

News of a mass shooting brings the members of Firehouse 51 into harrowing territory; Casey investigates the missing money from the fundraiser; Jimmy participates in a boxing match; Chili's erratic behavior continues to be a major issue for Brett.

Intelligence tracks down a vigilante who is killing rapists; Burgess begins to question if the men who attacked her sister truly paid for their actions.

Chili does not respond well when Severide tries to talk to her about her erratic behavior; members of the firehouse think Casey should run for the position of alderman; Jimmy and Antonio face off in a boxing match.

A string of bombings is targeting members of the media; the team enlists firehouse 51 to help examine the devices and prevent the next attack.

Firehouse 51 responds to an unusual call from another firehouse; the addition of a new firefighter (Miranda Rae Mayo) has repercussions; Casey realizes that certain voters have personal agendas for wanting him elected.

When a prominent alderman who is known for his urban revitalization efforts is killed, Intelligence looks into the corruption haunting his neighborhood; Olinsky feels pressure after receiving an ultimatum from Woods.

A propaganda attack causes Casey to reconsider his run for alderman; when a man is trapped inside a burning car, it seems the fire may have been set intentionally; Trudy's nerdy brother plans Mouch's bachelor party; a kidnapping investigation.

Upton brings back an old undercover identity to help take down a meth ring spearheaded by a former contact; with pressure from Woods mounting, Voight calls in a favor for Olinsky.

Severide is led to reexamine a case from the past while he investigates the discovery of a baby's body in a chimney; with election day nearing, Casey prepares for another confrontation with Alderman.

A string of robberies leads back to an unlikely individual; Voight confronts a key witness in the Bingham investigation.

A call takes a bad turn when Brett witnesses a murder while aiding a victim who has a leg wound; a restaurant fire has people trapped inside a vault; Mouch gets cold feet about his upcoming wedding.

The team works with a visiting detective to put an end to a gang's brutal tactics; Antonio learns that the detective has a hidden motive for being in Chicago; Voight learns that the body of his son's killer has been found.

Herrmann is tormented by a difficult decision; Casey is thrown into the spotlight at a fundraiser; Dawson and Brett are faced with the repercussions of their actions; Severide helps with a case regarding homemade explosives; Otis is surprised.

A basketball star is found murdered after an anti-police rally; a politically charged environment must be navigated while tracking down the killer; complicating matters further, Woods' daughter Brianna is tangled up in the case.

News of a mass shooting brings the members of Firehouse 51 into harrowing territory; Casey investigates the missing money from the fundraiser; Jimmy participates in a boxing match; Chili's erratic behavior continues to be a major issue for Brett.

Intelligence tracks down a vigilante who is killing rapists; Burgess begins to question if the men who attacked her sister truly paid for their actions.

Chili does not respond well when Severide tries to talk to her about her erratic behavior; members of the firehouse think Casey should run for the position of alderman; Jimmy and Antonio face off in a boxing match.

A string of bombings is targeting members of the media; the team enlists firehouse 51 to help examine the devices and prevent the next attack.

Firehouse 51 responds to an unusual call from another firehouse; the addition of a new firefighter (Miranda Rae Mayo) has repercussions; Casey realizes that certain voters have personal agendas for wanting him elected.

When a prominent alderman who is known for his urban revitalization efforts is killed, Intelligence looks into the corruption haunting his neighborhood; Olinsky feels pressure after receiving an ultimatum from Woods.

A propaganda attack causes Casey to reconsider his run for alderman; when a man is trapped inside a burning car, it seems the fire may have been set intentionally; Trudy's nerdy brother plans Mouch's bachelor party; a kidnapping investigation.

A 19-year-old Colorado media major disappears after a night on the town.

Severide is led to reexamine a case from the past while he investigates the discovery of a baby's body in a chimney; with election day nearing, Casey prepares for another confrontation with Alderman.

Advances in DNA science solve the 40-year cold case of a student's murder.

A call takes a bad turn when Brett witnesses a murder while aiding a victim who has a leg wound; a restaurant fire has people trapped inside a vault; Mouch gets cold feet about his upcoming wedding.

The team works with a visiting detective to put an end to a gang's brutal tactics; Antonio learns that the detective has a hidden motive for being in Chicago; Voight learns that the body of his son's killer has been found.

Herrmann is tormented by a difficult decision; Casey is thrown into the spotlight at a fundraiser; Dawson and Brett are faced with the repercussions of their actions; Severide helps with a case regarding homemade explosives; Otis is surprised.

A basketball star is found murdered after an anti-police rally; a politically charged environment must be navigated while tracking down the killer; complicating matters further, Woods' daughter Brianna is tangled up in the case.

News of a mass shooting brings the members of Firehouse 51 into harrowing territory; Casey investigates the missing money from the fundraiser; Jimmy participates in a boxing match; Chili's erratic behavior continues to be a major issue for Brett.

Intelligence tracks down a vigilante who is killing rapists; Burgess begins to question if the men who attacked her sister truly paid for their actions.

Chili does not respond well when Severide tries to talk to her about her erratic behavior; members of the firehouse think Casey should run for the position of alderman; Jimmy and Antonio face off in a boxing match.

A string of bombings is targeting members of the media; the team enlists firehouse 51 to help examine the devices and prevent the next attack.

Firehouse 51 responds to an unusual call from another firehouse; the addition of a new firefighter (Miranda Rae Mayo) has repercussions; Casey realizes that certain voters have personal agendas for wanting him elected.

When a prominent alderman who is known for his urban revitalization efforts is killed, Intelligence looks into the corruption haunting his neighborhood; Olinsky feels pressure after receiving an ultimatum from Woods.

A propaganda attack causes Casey to reconsider his run for alderman; when a man is trapped inside a burning car, it seems the fire may have been set intentionally; Trudy's nerdy brother plans Mouch's bachelor party; a kidnapping investigation.

Upton brings back an old undercover identity to help take down a meth ring spearheaded by a former contact; with pressure from Woods mounting, Voight calls in a favor for Olinsky.

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

A string of robberies leads back to an unlikely individual; Voight confronts a key witness in the Bingham investigation.

A small town encounters satanic rituals and a savage killer.

When neighbors stand up to a bully after his dog bites their son, a grudge he's been nursing for decades finally explodes into a frenzy of violence.

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

A small town encounters satanic rituals and a savage killer.

There is a connection discovered between Ed's shooter and a drug kingpin; Ed is rushed to surgery, as his wife experiences problems delivering their baby.

Top criminal investigators, forensic scientists and behavioral analysts track three serial killers.

When neighbors stand up to a bully after his dog bites their son, a grudge he's been nursing for decades finally explodes into a frenzy of violence.

Herrmann is tormented by a difficult decision; Casey is thrown into the spotlight at a fundraiser; Dawson and Brett are faced with the repercussions of their actions; Severide helps with a case regarding homemade explosives; Otis is surprised.

Knowledge of insects by a forensic entomologist leads police to the killer of a wife and mother of two.

News of a mass shooting brings the members of Firehouse 51 into harrowing territory; Casey investigates the missing money from the fundraiser; Jimmy participates in a boxing match; Chili's erratic behavior continues to be a major issue for Brett.

There is a connection discovered between Ed's shooter and a drug kingpin; Ed is rushed to surgery, as his wife experiences problems delivering their baby.

Chili does not respond well when Severide tries to talk to her about her erratic behavior; members of the firehouse think Casey should run for the position of alderman; Jimmy and Antonio face off in a boxing match.

When neighbors stand up to a bully after his dog bites their son, a grudge he's been nursing for decades finally explodes into a frenzy of violence.

Firehouse 51 responds to an unusual call from another firehouse; the addition of a new firefighter (Miranda Rae Mayo) has repercussions; Casey realizes that certain voters have personal agendas for wanting him elected.

A propaganda attack causes Casey to reconsider his run for alderman; when a man is trapped inside a burning car, it seems the fire may have been set intentionally; Trudy's nerdy brother plans Mouch's bachelor party; a kidnapping investigation.

There is a connection discovered between Ed's shooter and a drug kingpin; Ed is rushed to surgery, as his wife experiences problems delivering their baby.

Severide is led to reexamine a case from the past while he investigates the discovery of a baby's body in a chimney; with election day nearing, Casey prepares for another confrontation with Alderman.

Knowledge of insects by a forensic entomologist leads police to the killer of a wife and mother of two.

A call takes a bad turn when Brett witnesses a murder while aiding a victim who has a leg wound; a restaurant fire has people trapped inside a vault; Mouch gets cold feet about his upcoming wedding.

Herrmann is tormented by a difficult decision; Casey is thrown into the spotlight at a fundraiser; Dawson and Brett are faced with the repercussions of their actions; Severide helps with a case regarding homemade explosives; Otis is surprised.

News of a mass shooting brings the members of Firehouse 51 into harrowing territory; Casey investigates the missing money from the fundraiser; Jimmy participates in a boxing match; Chili's erratic behavior continues to be a major issue for Brett.

Chili does not respond well when Severide tries to talk to her about her erratic behavior; members of the firehouse think Casey should run for the position of alderman; Jimmy and Antonio face off in a boxing match.

Firehouse 51 responds to an unusual call from another firehouse; the addition of a new firefighter (Miranda Rae Mayo) has repercussions; Casey realizes that certain voters have personal agendas for wanting him elected.

A propaganda attack causes Casey to reconsider his run for alderman; when a man is trapped inside a burning car, it seems the fire may have been set intentionally; Trudy's nerdy brother plans Mouch's bachelor party; a kidnapping investigation.

Severide is led to reexamine a case from the past while he investigates the discovery of a baby's body in a chimney; with election day nearing, Casey prepares for another confrontation with Alderman.

There's no escape from the past; Skinhead Tyro seeks out Dante to avenge his beating, and Special Branch target Bardon and see an opportunity to use Gregory.

A call takes a bad turn when Brett witnesses a murder while aiding a victim who has a leg wound; a restaurant fire has people trapped inside a vault; Mouch gets cold feet about his upcoming wedding.

Casey attempts to use political influence to remedy a gang retribution incident; Severide helps Holloway in a dangerous undercover investigation.

Herrmann is tormented by a difficult decision; Casey is thrown into the spotlight at a fundraiser; Dawson and Brett are faced with the repercussions of their actions; Severide helps with a case regarding homemade explosives; Otis is surprised.

Detective Holloway testifies in court as part of an undercover operation, leaving Severide to watch her young son; a fire at an art gallery with a victim trapped inside leads Cruz to make a rash decision.

News of a mass shooting brings the members of Firehouse 51 into harrowing territory; Casey investigates the missing money from the fundraiser; Jimmy participates in a boxing match; Chili's erratic behavior continues to be a major issue for Brett.

Dawson risks her life to save a boy in an apartment fire; Severide pushes for an upgrade on the house's fire masks; Cruz and Brett have an idea to get Otis to take a blood test.

Chili does not respond well when Severide tries to talk to her about her erratic behavior; members of the firehouse think Casey should run for the position of alderman; Jimmy and Antonio face off in a boxing match.

There's no escape from the past; Skinhead Tyro seeks out Dante to avenge his beating, and Special Branch target Bardon and see an opportunity to use Gregory.

Firehouse 51 responds to an unusual call from another firehouse; the addition of a new firefighter (Miranda Rae Mayo) has repercussions; Casey realizes that certain voters have personal agendas for wanting him elected.

Lt. Boden and Jimmy are at odds in the aftermath of recent events; Kidd must deal with her volatile ex; Dawson puts on her best face in the pursuit of fostering Louie; Casey leaves town to attend a three-day summit.

A propaganda attack causes Casey to reconsider his run for alderman; when a man is trapped inside a burning car, it seems the fire may have been set intentionally; Trudy's nerdy brother plans Mouch's bachelor party; a kidnapping investigation.

Severide and Stella keep an eye out for Grant; Louie has Dawson questioning her dangerous career path; Casey's relationship with Susan Weller cools down; tensions between Borrelli and Boden reach a boiling point.

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

There's no escape from the past; Skinhead Tyro seeks out Dante to avenge his beating, and Special Branch target Bardon and see an opportunity to use Gregory.

A small town encounters satanic rituals and a savage killer.

When neighbors stand up to a bully after his dog bites their son, a grudge he's been nursing for decades finally explodes into a frenzy of violence.

Knowledge of insects by a forensic entomologist leads police to the killer of a wife and mother of two.

There is a connection discovered between Ed's shooter and a drug kingpin; Ed is rushed to surgery, as his wife experiences problems delivering their baby.

When neighbors stand up to a bully after his dog bites their son, a grudge he's been nursing for decades finally explodes into a frenzy of violence.

Knowledge of insects by a forensic entomologist leads police to the killer of a wife and mother of two.

There is a connection discovered between Ed's shooter and a drug kingpin; Ed is rushed to surgery, as his wife experiences problems delivering their baby.

When neighbors stand up to a bully after his dog bites their son, a grudge he's been nursing for decades finally explodes into a frenzy of violence.

There is a connection discovered between Ed's shooter and a drug kingpin; Ed is rushed to surgery, as his wife experiences problems delivering their baby.

Knowledge of insects by a forensic entomologist leads police to the killer of a wife and mother of two.

Casey attempts to use political influence to remedy a gang retribution incident; Severide helps Holloway in a dangerous undercover investigation.

Detective Holloway testifies in court as part of an undercover operation, leaving Severide to watch her young son; a fire at an art gallery with a victim trapped inside leads Cruz to make a rash decision.

Dawson risks her life to save a boy in an apartment fire; Severide pushes for an upgrade on the house's fire masks; Cruz and Brett have an idea to get Otis to take a blood test.

A building collapses and leaves dozens of people trapped and injured; Chief Boden faces a life-or-death decision in the rescue plan; Dawson continues her quest to foster Louie; tensions flare between Casey and Antonio.

Lt. Boden and Jimmy are at odds in the aftermath of recent events; Kidd must deal with her volatile ex; Dawson puts on her best face in the pursuit of fostering Louie; Casey leaves town to attend a three-day summit.

Severide and Stella keep an eye out for Grant; Louie has Dawson questioning her dangerous career path; Casey's relationship with Susan Weller cools down; tensions between Borrelli and Boden reach a boiling point.

There's no escape from the past; Skinhead Tyro seeks out Dante to avenge his beating, and Special Branch target Bardon and see an opportunity to use Gregory.

Casey attempts to use political influence to remedy a gang retribution incident; Severide helps Holloway in a dangerous undercover investigation.

Detective Holloway testifies in court as part of an undercover operation, leaving Severide to watch her young son; a fire at an art gallery with a victim trapped inside leads Cruz to make a rash decision.

Dawson risks her life to save a boy in an apartment fire; Severide pushes for an upgrade on the house's fire masks; Cruz and Brett have an idea to get Otis to take a blood test.

There's no escape from the past; Skinhead Tyro seeks out Dante to avenge his beating, and Special Branch target Bardon and see an opportunity to use Gregory.

Lt. Boden and Jimmy are at odds in the aftermath of recent events; Kidd must deal with her volatile ex; Dawson puts on her best face in the pursuit of fostering Louie; Casey leaves town to attend a three-day summit.

Severide and Stella keep an eye out for Grant; Louie has Dawson questioning her dangerous career path; Casey's relationship with Susan Weller cools down; tensions between Borrelli and Boden reach a boiling point.

There's no escape from the past; Skinhead Tyro seeks out Dante to avenge his beating, and Special Branch target Bardon and see an opportunity to use Gregory.