Eddie's journey to rescue a boy from a well turns into a mission to save himself from his past.

The 118 fights an apartment building blaze and attempts a daring rescue of a blind woman trapped inside; Athena discovers a potentially sinister crime; Hen performs a risky medical procedure after an accident at a televised cooking show.

The 118 races to rescue a little girl in a runaway hot air balloon and help with a city power outage caused by a hijacked tree-trimmer truck; Athena's investigation into the serial rapist case puts her life in jeopardy.

The 118 rush to save lives in the aftermath of a massive train derailment.

When the Hollywood Reservoir dam breaks, Bobby and the 118 race into action to save passengers on a city bus that has crashed into a building several stories in the air; the team adjusts to life as first responders during the pandemic.

A Texas playboy is murdered and police uncover x-rated photos, shocking videos and an object hidden inside the victim's body.

Phoenix police are faced with a unique serial killer team who get their thrills stalking and shooting innocent people at night.

Police in Abbotsford, B.C. hunt a stalker who has left one teen dead and another barely alive.

A killer who leaves messages signed "Jack" terrorizes East Point, Ga.

Police discover a murdered teenage girl was involved in a love triangle.

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.

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

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

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.

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

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

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.

Police in Abbotsford, B.C. hunt a stalker who has left one teen dead and another barely alive.

A killer who leaves messages signed "Jack" terrorizes East Point, Ga.

In Oregon, a couple learns their new neighbor has a deadly past, then relations sour, tempers flare and blood is spilled.

Todd Kendhammer claims his wife was killed in a car accident; the forensic evidence doesn't back him up; when a new defense team, known for working on the Steve Avery case is hired, they bring in their own forensic experts who contradict the case.

The SRU is called in when a bank employee whose wife is being held captive hacks into the computer system to steal money to pay off her captors.

In Oregon, a couple learns their new neighbor has a deadly past, then relations sour, tempers flare and blood is spilled.

Todd Kendhammer claims his wife was killed in a car accident; the forensic evidence doesn't back him up; when a new defense team, known for working on the Steve Avery case is hired, they bring in their own forensic experts who contradict the case.

The SRU is called in when a bank employee whose wife is being held captive hacks into the computer system to steal money to pay off her captors.

In Oregon, a couple learns their new neighbor has a deadly past, then relations sour, tempers flare and blood is spilled.

The SRU is called in when a bank employee whose wife is being held captive hacks into the computer system to steal money to pay off her captors.

Todd Kendhammer claims his wife was killed in a car accident; the forensic evidence doesn't back him up; when a new defense team, known for working on the Steve Avery case is hired, they bring in their own forensic experts who contradict the case.

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

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

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

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

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

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

After receiving a mysterious package from her estranged father, L.A. divorce lawyer Fiona Sharpe travels to Ireland to uncover the truth-only to find herself entangled in a web of family secrets, lies, and danger.

Striking back at the Italians, Bumpy exploits Chin's dark past; Mayme and Elise put aside their differences and Bumpy sees his wife and children reunited before his war explodes.

Chin and Bonnano are at war in Harlem; Mayme asks Bumpy to create a will where Bumpy finds out he and Mayme never formally adopted Margaret; Malcolm X and Adam Clayton Powell Jr. go to D.C. for the March on Washington.

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

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

After receiving a mysterious package from her estranged father, L.A. divorce lawyer Fiona Sharpe travels to Ireland to uncover the truth-only to find herself entangled in a web of family secrets, lies, and danger.

Striking back at the Italians, Bumpy exploits Chin's dark past; Mayme and Elise put aside their differences and Bumpy sees his wife and children reunited before his war explodes.

Chin and Bonnano are at war in Harlem; Mayme asks Bumpy to create a will where Bumpy finds out he and Mayme never formally adopted Margaret; Malcolm X and Adam Clayton Powell Jr. go to D.C. for the March on Washington.

In Euclid, Ohio, a teenage boy develops a crush on the girl next door but gets rebuffed, setting the stage for murder.

When Leslie Neulander's death is declared accidental, forensic investigators sound the alarm that it was no accident.

The team must diffuse a volatile situation when a student pushed to the limit by bullies brings a gun to school.

In Euclid, Ohio, a teenage boy develops a crush on the girl next door but gets rebuffed, setting the stage for murder.

When Leslie Neulander's death is declared accidental, forensic investigators sound the alarm that it was no accident.

The team must diffuse a volatile situation when a student pushed to the limit by bullies brings a gun to school.

In Euclid, Ohio, a teenage boy develops a crush on the girl next door but gets rebuffed, setting the stage for murder.

The team must diffuse a volatile situation when a student pushed to the limit by bullies brings a gun to school.

When Leslie Neulander's death is declared accidental, forensic investigators sound the alarm that it was no accident.

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

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.

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

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.

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

In Alden, N.Y., siblings who live next door to each other get into a conflict when a brother returns home; soon, they are at each other's throats and their family feud comes to a fiery end.

A suitcase filled with unidentified human remains unlocks a missing person's case that has gone unsolved for years; the forensic analysis of a nearly-destroyed cellphone found in the suitcase reveals a mysterious selfie.

The team must track down a young woman dying of a brain disease when she and her fiance go on a crime spree.

In Alden, N.Y., siblings who live next door to each other get into a conflict when a brother returns home; soon, they are at each other's throats and their family feud comes to a fiery end.

A suitcase filled with unidentified human remains unlocks a missing person's case that has gone unsolved for years; the forensic analysis of a nearly-destroyed cellphone found in the suitcase reveals a mysterious selfie.

The team must track down a young woman dying of a brain disease when she and her fiance go on a crime spree.

In Alden, N.Y., siblings who live next door to each other get into a conflict when a brother returns home; soon, they are at each other's throats and their family feud comes to a fiery end.

The team must track down a young woman dying of a brain disease when she and her fiance go on a crime spree.

A suitcase filled with unidentified human remains unlocks a missing person's case that has gone unsolved for years; the forensic analysis of a nearly-destroyed cellphone found in the suitcase reveals a mysterious selfie.

Athena investigates a mysterious murder during a neighborhood block party; the 118 rush to save lives endangered by a bomb threat; Chimney has a hard time keeping secrets when Maddie and Buck's parents come to town.

The 118 races to save the lives of workers trapped in a factory fire; Maddie reveals a painful family secret that causes Buck to confront his childhood and answer why he is the daredevil he is today.

The 118 has a day from hell with a never-ending series of bizarre emergency calls; a man tapes himself to a freeway billboard; a restaurant manager destroys his own business; Eddie feels a spark with Christopher's former teacher.

A man gets pinned under a Humvee; a garage band rocks out too hard; Michael notices strange behavior at a nearby apartment; Hen's mother unexpectedly arrives and announces she is moving to Los Angeles.

The 118 are called to the tarmac when a flight attendant reaches her limit with her flight's passengers; Eddie worries Christopher will not accept him dating; Buck reconnects with an old flame.

Athena and the 118 race to save lives after a drunken driver causes a deadly pileup on the freeway; Maddie goes into labor; Hen and Karen are devastated as they prepare their foster daughter to be reunited with her birth mother.

While conducting a wellness check on the agoraphobic recluse who controls the town power grid, Martin's brusque bedside manner ultimately causes a massive town black out; as the townspeople fight for electricity, Martin befriends a young boy who reminds him of himself; Louisa and Mark share a romantic moment in the dark.

Athena investigates a mysterious murder during a neighborhood block party; the 118 rush to save lives endangered by a bomb threat; Chimney has a hard time keeping secrets when Maddie and Buck's parents come to town.

The 118 races to save the lives of workers trapped in a factory fire; Maddie reveals a painful family secret that causes Buck to confront his childhood and answer why he is the daredevil he is today.

The 118 has a day from hell with a never-ending series of bizarre emergency calls; a man tapes himself to a freeway billboard; a restaurant manager destroys his own business; Eddie feels a spark with Christopher's former teacher.

A man gets pinned under a Humvee; a garage band rocks out too hard; Michael notices strange behavior at a nearby apartment; Hen's mother unexpectedly arrives and announces she is moving to Los Angeles.

The 118 are called to the tarmac when a flight attendant reaches her limit with her flight's passengers; Eddie worries Christopher will not accept him dating; Buck reconnects with an old flame.

Athena and the 118 race to save lives after a drunken driver causes a deadly pileup on the freeway; Maddie goes into labor; Hen and Karen are devastated as they prepare their foster daughter to be reunited with her birth mother.

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.

While conducting a wellness check on the agoraphobic recluse who controls the town power grid, Martin's brusque bedside manner ultimately causes a massive town black out; as the townspeople fight for electricity, Martin befriends a young boy who reminds him of himself; Louisa and Mark share a romantic moment in the dark.

In Longboat Key, Fla., a psychologist discovers her neighbor may be a violent criminal and vows to protect herself - with devastating consequences.

When Lanell Barsock is found murdered, it seems obvious to all that her boyfriend did it; when the forensic evidence comes in, investigators are astonished to learn they've arrested the wrong person.

The team tries to end a standoff at a hospital between gang members and a man trying to protect his injured brother.

In Longboat Key, Fla., a psychologist discovers her neighbor may be a violent criminal and vows to protect herself - with devastating consequences.

When Lanell Barsock is found murdered, it seems obvious to all that her boyfriend did it; when the forensic evidence comes in, investigators are astonished to learn they've arrested the wrong person.

The team tries to end a standoff at a hospital between gang members and a man trying to protect his injured brother.

In Longboat Key, Fla., a psychologist discovers her neighbor may be a violent criminal and vows to protect herself - with devastating consequences.

The team tries to end a standoff at a hospital between gang members and a man trying to protect his injured brother.

When Lanell Barsock is found murdered, it seems obvious to all that her boyfriend did it; when the forensic evidence comes in, investigators are astonished to learn they've arrested the wrong person.

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 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 case; Dr. Marcel and Maggie throw a traditional crawfish boil for the staff; a new relationship blossoms while another is left on rocky ground.

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 International Airport, 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.

It's finale day and the three finalists unveil their collections which showcase their unique vision and artistry; with ten models each and $100,000 on the line, every detail matters; guest judge Jason Wu returns as the judges make their final decision and crown the winner.

Dr. Manning's actions with a 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 case; Dr. Marcel and Maggie throw a traditional crawfish boil for the staff; a new relationship blossoms while another is left on rocky ground.

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 International Airport, 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.

It's finale day and the three finalists unveil their collections which showcase their unique vision and artistry; with ten models each and $100,000 on the line, every detail matters; guest judge Jason Wu returns as the judges make their final decision and crown the winner.

In Tamarac, Fla., a new boy becomes friends with the most unruly youngsters in his neighborhood, leading to bad blood that boils over on Halloween and comes to a horrific end.

Homicide investigators are convinced an apparent murder-suicide was staged but the experienced CSI on the scene disagrees; only the instincts of the cops, coupled with an outside forensic expert's opinion, convince authorities who the real killer is.

While broadcasting live, a notorious radio-show host holds a prominent politician hostage.

In Tamarac, Fla., a new boy becomes friends with the most unruly youngsters in his neighborhood, leading to bad blood that boils over on Halloween and comes to a horrific end.

Homicide investigators are convinced an apparent murder-suicide was staged but the experienced CSI on the scene disagrees; only the instincts of the cops, coupled with an outside forensic expert's opinion, convince authorities who the real killer is.

While broadcasting live, a notorious radio-show host holds a prominent politician hostage.

In Tamarac, Fla., a new boy becomes friends with the most unruly youngsters in his neighborhood, leading to bad blood that boils over on Halloween and comes to a horrific end.

While broadcasting live, a notorious radio-show host holds a prominent politician hostage.

Homicide investigators are convinced an apparent murder-suicide was staged but the experienced CSI on the scene disagrees; only the instincts of the cops, coupled with an outside forensic expert's opinion, convince authorities who the real killer is.

Officer Nolan's trust is tested when he tries to help the previous owner of his home reconnect with his family; Officer Harper's overnight visit with her daughter is put into jeopardy when her past undercover life resurfaces again.

Officer Nolan and the team are charged with escorting a notorious female serial killer to the graves of her victims; Officer Chen meets a seemingly perfect man who sparks her interest; Officer Lopez worries about Wesley.

Officer Nolan and the entire team are in a desperate search to rescue Officer Chen after her abduction; Officer Lopez discovers Wesley unconscious from a dangerous cocktail of alcohol and pills.

Nolan takes his son's fiancée, Abigail, on a ride-along after she shows interest in becoming a police officer; Jackson's relationship becomes increasingly complicated.

Nolan is given some life-changing news and invites Grace over for a home-cooked meal in his newly remodeled kitchen; each unit is tasked with following up on dormant cases in hopes of uncovering new leads.

Officers Nolan and Harper investigate a murder which may have national security implications; Officer Bradford must confront his past when he crosses paths with a homeless veteran.

Officer Nolan learns his identity has been stolen and could jeopardize his position as an officer; Sgt. Grey must testify at the parole hearing of the man who shot him and murdered his partner.

Dutch assigns Angelo to kill an Internal Affairs agent who threatens to take down their whole operation; still rattled by the shooting, Maria seeks Dave's help in procuring a gun; agent Grant runs into Angelo, who suspects she may see him as more than just the father of a victim.

Officer Nolan and the team are charged with escorting a notorious female serial killer to the graves of her victims; Officer Chen meets a seemingly perfect man who sparks her interest; Officer Lopez worries about Wesley.

Officer Nolan and the entire team are in a desperate search to rescue Officer Chen after her abduction; Officer Lopez discovers Wesley unconscious from a dangerous cocktail of alcohol and pills.

Dutch assigns Angelo to kill an Internal Affairs agent who threatens to take down their whole operation; still rattled by the shooting, Maria seeks Dave's help in procuring a gun; agent Grant runs into Angelo, who suspects she may see him as more than just the father of a victim.

Nolan is given some life-changing news and invites Grace over for a home-cooked meal in his newly remodeled kitchen; each unit is tasked with following up on dormant cases in hopes of uncovering new leads.

Officers Nolan and Harper investigate a murder which may have national security implications; Officer Bradford must confront his past when he crosses paths with a homeless veteran.

Officer Nolan learns his identity has been stolen and could jeopardize his position as an officer; Sgt. Grey must testify at the parole hearing of the man who shot him and murdered his partner.

Officer Nolan's trust is tested when he tries to help the previous owner of his home reconnect with his family; Officer Harper's overnight visit with her daughter is put into jeopardy when her past undercover life resurfaces again.

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

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

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

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.

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.

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.

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

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.

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 the citywide blackout continues to cause mayhem in Los Angeles, Athena races to save her family from a tragedy; Eddie must make a difficult choice about his future; Maddie makes a life-changing decision.

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.

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.

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.

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

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.

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 the citywide blackout continues to cause mayhem in Los Angeles, Athena races to save her family from a tragedy; Eddie must make a difficult choice about his future; Maddie makes a life-changing decision.

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.

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.

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.

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

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.

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

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

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Using technology to solve crime.

Fire, water, earth - killers call on all the elements in their attempt to cover up their crimes.

A wave of terrorist bombs shuts down the city; a member of the team makes a sacrifice.

In Dayton, Ohio, a woman welcomes a young family when they move into the long-derelict house next door, then escalating fights over pets and children lead to a deadly confrontation.

Fire, water, earth - killers call on all the elements in their attempt to cover up their crimes.

A wave of terrorist bombs shuts down the city; a member of the team makes a sacrifice.

In Dayton, Ohio, a woman welcomes a young family when they move into the long-derelict house next door, then escalating fights over pets and children lead to a deadly confrontation.

A wave of terrorist bombs shuts down the city; a member of the team makes a sacrifice.

Fire, water, earth - killers call on all the elements in their attempt to cover up their crimes.

Herrmann tries to rescue a toddler from a structure fire; Mills discovers unexpected news; Brett and Cruz's relationship reaches a critical juncture; Otis is surprised by some feelings that develop.

Members of Firehouse 51 transport victims of a gas leak to nearby Chicago Med; an armed patient claiming to be carrying a deadly airborne disease forces Chicago Med into lockdown.

Mills works to save the life of a driver injured in a car wreck; Casey harbors doubts about Jack Nesbitt; Hermann, Otis, Cruz and Chaplain Orlovsky ready their team for the peewee hockey championship.