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.

The rookies are really put to the test when they are forced to make all decisions while on patrol; officer Nolan tries to prove he has been progressing faster than the other rookies to justify his desire of becoming a detective within five years.

Featuring the designers, as they head to TMU's Design and Technology Lab to create futuristic looks for the year 2125.

The team is on high alert during the most dangerous day of the year, Valentine's Day; officer Nolan invites everyone over for a party now that he is single.

Mixing business with pleasure spells murder for neighboring best friends.

A serial killer in Spokane, Wash. murders prostitutes and leaves a bag with a smiley face on the victim's head.

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

Two brothers become involved with a white supremacy group planning a terrorist attack.

Investigating a series of fires in California's Sam Joaquin Valley that killed four, investigators determine a respected arson investigator may be the arsonist.

Mixing business with pleasure spells murder for neighboring best friends.

Athena and Bobby set off on their honeymoon cruise, but when duty calls, their vacation is put on hold; a fighter jet traps a civilian; an unusual incident leaves a couple stuck together.

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

The disastrous cruise continues when Bobby and Athena respond to the ship's explosion, racing to aid injured passengers; Hen questions her instincts in a life-taking call and grows concerned about Athena and Bobby's whereabouts.

Two brothers become involved with a white supremacy group planning a terrorist attack.

With each moment becoming critical as the ship flips upside down, Athena and Bobby take charge, seeking methods for rescue while navigating efforts to guide survivors to safety; Hen defies protocols in her search for Bobby and Athena.

Mixing business with pleasure spells murder for neighboring best friends.

Upon her return to shore, Athena's son finds himself in trouble with the law; Buck grows envious as Eddie forms a close bond with someone else; the team rescues a woman who's stuck on receiving a rose at an iconic mansion.

Two brothers become involved with a white supremacy group planning a terrorist attack.

Hen and Karen welcome a new addition to their family; a call unfolds involving a person's limb that's taken on a mind of its own; Eddie and Marisol take a closer look at their relationship; Buck navigates his new feelings.

The Duprees, a powerful and prestigious multi-generational family that is the very definition of Black royalty, live, love, work and play in a leafy Maryland suburb just outside of Washington D.C.

After years of anticipation, Maddie and Chimney's long-awaited wedding day arrives; when the groom mysteriously vanishes, the 118 races against time to ensure he doesn't miss the most crucial day of his life.

Officer Nolan and Sgt. Grey are paired up for the day on patrol; Officer Chen is paired up with Capt. Andersen, and Officer Bradford tells Chen to protect her at all costs.

Maddie and Athena investigate a case surrounding an abducted mother and child; Hen and Karen learn more about Mara's family history; Eddie grapples with unresolved feelings for someone from his past.

An unscheduled visit by the vice president of the United States puts the station on high alert; the Secret Service tasks Nolan and Bishop with checking out a possible threat while the rest of the team tries to keep the streets safe for his visit.

Athena and Bobby set off on their honeymoon cruise, but when duty calls, their vacation is put on hold; a fighter jet traps a civilian; an unusual incident leaves a couple stuck together.

The team is on high alert during the most dangerous day of the year, Valentine's Day; officer Nolan invites everyone over for a party now that he is single.

The disastrous cruise continues when Bobby and Athena respond to the ship's explosion, racing to aid injured passengers; Hen questions her instincts in a life-taking call and grows concerned about Athena and Bobby's whereabouts.

A large sum of money used in a drug bust goes missing; the rookies become the prime suspects, as they had previously discussed what they would do with the money.

With each moment becoming critical as the ship flips upside down, Athena and Bobby take charge, seeking methods for rescue while navigating efforts to guide survivors to safety; Hen defies protocols in her search for Bobby and Athena.

The rookies are really put to the test when they are forced to make all decisions while on patrol; officer Nolan tries to prove he has been progressing faster than the other rookies to justify his desire of becoming a detective within five years.

Upon her return to shore, Athena's son finds himself in trouble with the law; Buck grows envious as Eddie forms a close bond with someone else; the team rescues a woman who's stuck on receiving a rose at an iconic mansion.

An unscheduled visit by the vice president of the United States puts the station on high alert; the Secret Service tasks Nolan and Bishop with checking out a possible threat while the rest of the team tries to keep the streets safe for his visit.

Hen and Karen welcome a new addition to their family; a call unfolds involving a person's limb that's taken on a mind of its own; Eddie and Marisol take a closer look at their relationship; Buck navigates his new feelings.

When chasing down leads about his father's past, Colter meets a man desperate to find his daughter who vanished while working a courier route; Colter is pulled into an orbit of a wealthy family and their ruthless fixer.

After years of anticipation, Maddie and Chimney's long-awaited wedding day arrives; when the groom mysteriously vanishes, the 118 races against time to ensure he doesn't miss the most crucial day of his life.

The team is on high alert during the most dangerous day of the year, Valentine's Day; officer Nolan invites everyone over for a party now that he is single.

Maddie and Athena investigate a case surrounding an abducted mother and child; Hen and Karen learn more about Mara's family history; Eddie grapples with unresolved feelings for someone from his past.

An unscheduled visit by the vice president of the United States puts the station on high alert; the Secret Service tasks Nolan and Bishop with checking out a possible threat while the rest of the team tries to keep the streets safe for his visit.

Athena and Bobby set off on their honeymoon cruise, but when duty calls, their vacation is put on hold; a fighter jet traps a civilian; an unusual incident leaves a couple stuck together.

When chasing down leads about his father's past, Colter meets a man desperate to find his daughter who vanished while working a courier route; Colter is pulled into an orbit of a wealthy family and their ruthless fixer.

The disastrous cruise continues when Bobby and Athena respond to the ship's explosion, racing to aid injured passengers; Hen questions her instincts in a life-taking call and grows concerned about Athena and Bobby's whereabouts.

With each moment becoming critical as the ship flips upside down, Athena and Bobby take charge, seeking methods for rescue while navigating efforts to guide survivors to safety; Hen defies protocols in her search for Bobby and Athena.

A large sum of money used in a drug bust goes missing; the rookies become the prime suspects, as they had previously discussed what they would do with the money.

Upon her return to shore, Athena's son finds himself in trouble with the law; Buck grows envious as Eddie forms a close bond with someone else; the team rescues a woman who's stuck on receiving a rose at an iconic mansion.

The rookies are really put to the test when they are forced to make all decisions while on patrol; officer Nolan tries to prove he has been progressing faster than the other rookies to justify his desire of becoming a detective within five years.

A large sum of money used in a drug bust goes missing; the rookies become the prime suspects, as they had previously discussed what they would do with the money.

Hen and Karen welcome a new addition to their family; a call unfolds involving a person's limb that's taken on a mind of its own; Eddie and Marisol take a closer look at their relationship; Buck navigates his new feelings.

The rookies are really put to the test when they are forced to make all decisions while on patrol; officer Nolan tries to prove he has been progressing faster than the other rookies to justify his desire of becoming a detective within five years.

A serial killer in Spokane, Wash. murders prostitutes and leaves a bag with a smiley face on the victim's head.

The team is on high alert during the most dangerous day of the year, Valentine's Day; officer Nolan invites everyone over for a party now that he is single.

Officials look to state-of-the-art DNA analysis to help capture a serial killer in the Louisiana State University area of Baton Rouge.

A serial killer in Spokane, Wash. murders prostitutes and leaves a bag with a smiley face on the victim's head.

Officials look to state-of-the-art DNA analysis to help capture a serial killer in the Louisiana State University area of Baton Rouge.

Investigating a series of fires in California's Sam Joaquin Valley that killed four, investigators determine a respected arson investigator may be the arsonist.

Athena and Bobby set off on their honeymoon cruise, but when duty calls, their vacation is put on hold; a fighter jet traps a civilian; an unusual incident leaves a couple stuck together.

A horrible storm wreaks havoc on Chicago and impacts Firehouse 51 when the power goes off; when a little boy mysteriously shows up at the station, everyone works together to uncover who he belongs to; Foster and Kidd argue about Severide.

The disastrous cruise continues when Bobby and Athena respond to the ship's explosion, racing to aid injured passengers; Hen questions her instincts in a life-taking call and grows concerned about Athena and Bobby's whereabouts.

Severide and Boden search to uncover whether arson was the cause of a fire at a hair salon; Mouch, Herrmann, Otis and Kidd make a startling discovery while tracking down the missing piercing nozzle from Engine 27.

With each moment becoming critical as the ship flips upside down, Athena and Bobby take charge, seeking methods for rescue while navigating efforts to guide survivors to safety; Hen defies protocols in her search for Bobby and Athena.

A serial arsonist cold case is reopened when Lt. Severide finds a connection to a recent salon fire; Firehouse 51 celebrates a retirement party.

Upon her return to shore, Athena's son finds himself in trouble with the law; Buck grows envious as Eddie forms a close bond with someone else; the team rescues a woman who's stuck on receiving a rose at an iconic mansion.

Severide and Kidd continue to investigate Benny's old arson case; unexpected news leads Brett to ponder a big decision; all hell breaks loose.

Hen and Karen welcome a new addition to their family; a call unfolds involving a person's limb that's taken on a mind of its own; Eddie and Marisol take a closer look at their relationship; Buck navigates his new feelings.

The mattress factory fire spirals out of control; truck and squad lay it on the line in hopes of getting the trapped victims out alive.

After years of anticipation, Maddie and Chimney's long-awaited wedding day arrives; when the groom mysteriously vanishes, the 118 races against time to ensure he doesn't miss the most crucial day of his life.

Casey struggles to get Boden to sign off on an energetic new recruit; Foster extends an olive branch to her irritating new medic; Otis inspires Herrmann to seek new partners at Molly's; Brett realizes life in Fowlerton will take some getting used to.

Maddie and Athena investigate a case surrounding an abducted mother and child; Hen and Karen learn more about Mara's family history; Eddie grapples with unresolved feelings for someone from his past.

Brett and Foster question the suspicious circumstances surrounding an attack at a juvenile detention center; a convoluted new technology at Firehouse 51 tests everybody's patience; Kidd is chosen to represent the district at a leadership conference.

Athena and Bobby set off on their honeymoon cruise, but when duty calls, their vacation is put on hold; a fighter jet traps a civilian; an unusual incident leaves a couple stuck together.

A horrible storm wreaks havoc on Chicago and impacts Firehouse 51 when the power goes off; when a little boy mysteriously shows up at the station, everyone works together to uncover who he belongs to; Foster and Kidd argue about Severide.

The disastrous cruise continues when Bobby and Athena respond to the ship's explosion, racing to aid injured passengers; Hen questions her instincts in a life-taking call and grows concerned about Athena and Bobby's whereabouts.

Severide and Boden search to uncover whether arson was the cause of a fire at a hair salon; Mouch, Herrmann, Otis and Kidd make a startling discovery while tracking down the missing piercing nozzle from Engine 27.

With each moment becoming critical as the ship flips upside down, Athena and Bobby take charge, seeking methods for rescue while navigating efforts to guide survivors to safety; Hen defies protocols in her search for Bobby and Athena.

A serial arsonist cold case is reopened when Lt. Severide finds a connection to a recent salon fire; Firehouse 51 celebrates a retirement party.

Upon her return to shore, Athena's son finds himself in trouble with the law; Buck grows envious as Eddie forms a close bond with someone else; the team rescues a woman who's stuck on receiving a rose at an iconic mansion.

Severide and Kidd continue to investigate Benny's old arson case; unexpected news leads Brett to ponder a big decision; all hell breaks loose.

Hen and Karen welcome a new addition to their family; a call unfolds involving a person's limb that's taken on a mind of its own; Eddie and Marisol take a closer look at their relationship; Buck navigates his new feelings.

The mattress factory fire spirals out of control; truck and squad lay it on the line in hopes of getting the trapped victims out alive.

After years of anticipation, Maddie and Chimney's long-awaited wedding day arrives; when the groom mysteriously vanishes, the 118 races against time to ensure he doesn't miss the most crucial day of his life.

Casey struggles to get Boden to sign off on an energetic new recruit; Foster extends an olive branch to her irritating new medic; Otis inspires Herrmann to seek new partners at Molly's; Brett realizes life in Fowlerton will take some getting used to.

Maddie and Athena investigate a case surrounding an abducted mother and child; Hen and Karen learn more about Mara's family history; Eddie grapples with unresolved feelings for someone from his past.

Brett and Foster question the suspicious circumstances surrounding an attack at a juvenile detention center; a convoluted new technology at Firehouse 51 tests everybody's patience; Kidd is chosen to represent the district at a leadership conference.

Athena and Bobby set off on their honeymoon cruise, but when duty calls, their vacation is put on hold; a fighter jet traps a civilian; an unusual incident leaves a couple stuck together.

A horrible storm wreaks havoc on Chicago and impacts Firehouse 51 when the power goes off; when a little boy mysteriously shows up at the station, everyone works together to uncover who he belongs to; Foster and Kidd argue about Severide.

The disastrous cruise continues when Bobby and Athena respond to the ship's explosion, racing to aid injured passengers; Hen questions her instincts in a life-taking call and grows concerned about Athena and Bobby's whereabouts.

Severide and Boden search to uncover whether arson was the cause of a fire at a hair salon; Mouch, Herrmann, Otis and Kidd make a startling discovery while tracking down the missing piercing nozzle from Engine 27.

With each moment becoming critical as the ship flips upside down, Athena and Bobby take charge, seeking methods for rescue while navigating efforts to guide survivors to safety; Hen defies protocols in her search for Bobby and Athena.

A serial arsonist cold case is reopened when Lt. Severide finds a connection to a recent salon fire; Firehouse 51 celebrates a retirement party.

Upon her return to shore, Athena's son finds himself in trouble with the law; Buck grows envious as Eddie forms a close bond with someone else; the team rescues a woman who's stuck on receiving a rose at an iconic mansion.

Severide and Kidd continue to investigate Benny's old arson case; unexpected news leads Brett to ponder a big decision; all hell breaks loose.

Hen and Karen welcome a new addition to their family; a call unfolds involving a person's limb that's taken on a mind of its own; Eddie and Marisol take a closer look at their relationship; Buck navigates his new feelings.

The mattress factory fire spirals out of control; truck and squad lay it on the line in hopes of getting the trapped victims out alive.

A serial killer in Spokane, Wash. murders prostitutes and leaves a bag with a smiley face on the victim's head.

Officials look to state-of-the-art DNA analysis to help capture a serial killer in the Louisiana State University area of Baton Rouge.

On a quiet cul de sac, a contractor helps his neighbor rent the home beside him; unwittingly trapping himself between an increasingly unhinged presence on one side and the man's hostile parents on the other.

Investigators work to solve a double homicide in the small town of Hudson, Wisc.

Police must use forensic science to solve the mystery of a prominent businessman whose burnt body is discovered.

A high school athlete threatens suicide after being kidnapped and beaten.

A phantom white supremacist sect takes credits for bombings and bank robberies in Spokane, Wash., but FBI forensic photo analysts clears the picture.

On a quiet cul de sac, a contractor helps his neighbor rent the home beside him; unwittingly trapping himself between an increasingly unhinged presence on one side and the man's hostile parents on the other.

A horrible storm wreaks havoc on Chicago and impacts Firehouse 51 when the power goes off; when a little boy mysteriously shows up at the station, everyone works together to uncover who he belongs to; Foster and Kidd argue about Severide.

When the prime subject for four factory deaths has a perfect alibi, investigators use video analysis, timeline reconstruction and a 3-year old fingerprint to solve the crime.

Severide and Boden search to uncover whether arson was the cause of a fire at a hair salon; Mouch, Herrmann, Otis and Kidd make a startling discovery while tracking down the missing piercing nozzle from Engine 27.

A high school athlete threatens suicide after being kidnapped and beaten.

A serial arsonist cold case is reopened when Lt. Severide finds a connection to a recent salon fire; Firehouse 51 celebrates a retirement party.

On a quiet cul de sac, a contractor helps his neighbor rent the home beside him; unwittingly trapping himself between an increasingly unhinged presence on one side and the man's hostile parents on the other.

Severide and Kidd continue to investigate Benny's old arson case; unexpected news leads Brett to ponder a big decision; all hell breaks loose.

A high school athlete threatens suicide after being kidnapped and beaten.

The mattress factory fire spirals out of control; truck and squad lay it on the line in hopes of getting the trapped victims out alive.

Keke Wyatt sings at WinterFest; Nicole's date takes her by surprise; Vanessa's troubled by Joey's lack of support, while Kat thanks him for his unexpected help; Leslie tells Marcel there's a looming scandal that could rock Fairmont Crest.

Casey struggles to get Boden to sign off on an energetic new recruit; Foster extends an olive branch to her irritating new medic; Otis inspires Herrmann to seek new partners at Molly's; Brett realizes life in Fowlerton will take some getting used to.

Brett and Foster question the suspicious circumstances surrounding an attack at a juvenile detention center; a convoluted new technology at Firehouse 51 tests everybody's patience; Kidd is chosen to represent the district at a leadership conference.

A horrible storm wreaks havoc on Chicago and impacts Firehouse 51 when the power goes off; when a little boy mysteriously shows up at the station, everyone works together to uncover who he belongs to; Foster and Kidd argue about Severide.

Severide and Boden search to uncover whether arson was the cause of a fire at a hair salon; Mouch, Herrmann, Otis and Kidd make a startling discovery while tracking down the missing piercing nozzle from Engine 27.

A serial arsonist cold case is reopened when Lt. Severide finds a connection to a recent salon fire; Firehouse 51 celebrates a retirement party.

Severide and Kidd continue to investigate Benny's old arson case; unexpected news leads Brett to ponder a big decision; all hell breaks loose.

The mattress factory fire spirals out of control; truck and squad lay it on the line in hopes of getting the trapped victims out alive.

Casey struggles to get Boden to sign off on an energetic new recruit; Foster extends an olive branch to her irritating new medic; Otis inspires Herrmann to seek new partners at Molly's; Brett realizes life in Fowlerton will take some getting used to.

Brett and Foster question the suspicious circumstances surrounding an attack at a juvenile detention center; a convoluted new technology at Firehouse 51 tests everybody's patience; Kidd is chosen to represent the district at a leadership conference.

A horrible storm wreaks havoc on Chicago and impacts Firehouse 51 when the power goes off; when a little boy mysteriously shows up at the station, everyone works together to uncover who he belongs to; Foster and Kidd argue about Severide.

Severide and Boden search to uncover whether arson was the cause of a fire at a hair salon; Mouch, Herrmann, Otis and Kidd make a startling discovery while tracking down the missing piercing nozzle from Engine 27.

A serial arsonist cold case is reopened when Lt. Severide finds a connection to a recent salon fire; Firehouse 51 celebrates a retirement party.

Severide and Kidd continue to investigate Benny's old arson case; unexpected news leads Brett to ponder a big decision; all hell breaks loose.

The mattress factory fire spirals out of control; truck and squad lay it on the line in hopes of getting the trapped victims out alive.

Investigators work to solve a double homicide in the small town of Hudson, Wisc.

Members of Firehouse 51 are dismayed to learn their boundaries have been redrawn to overlap with an adjacent station, and problems quickly arise; Casey and Gallo hunt a missing piece of equipment; Brett and Foster find themselves at odds.

Police must use forensic science to solve the mystery of a prominent businessman whose burnt body is discovered.

A rare but deadly bacteria takes its toll on numerous victims around the city, leaving Chicago's finest first responders to work together alongside the CDC to resolve the dangerous situation; Severide suspects something bigger is happening.

On a quiet cul de sac, a contractor helps his neighbor rent the home beside him; unwittingly trapping himself between an increasingly unhinged presence on one side and the man's hostile parents on the other.

When the prime subject for four factory deaths has a perfect alibi, investigators use video analysis, timeline reconstruction and a 3-year old fingerprint to solve the crime.

A high school athlete threatens suicide after being kidnapped and beaten.

On a quiet cul de sac, a contractor helps his neighbor rent the home beside him; unwittingly trapping himself between an increasingly unhinged presence on one side and the man's hostile parents on the other.

When the prime subject for four factory deaths has a perfect alibi, investigators use video analysis, timeline reconstruction and a 3-year old fingerprint to solve the crime.

A high school athlete threatens suicide after being kidnapped and beaten.

On a quiet cul de sac, a contractor helps his neighbor rent the home beside him; unwittingly trapping himself between an increasingly unhinged presence on one side and the man's hostile parents on the other.

A high school athlete threatens suicide after being kidnapped and beaten.

Keke Wyatt sings at WinterFest; Nicole's date takes her by surprise; Vanessa's troubled by Joey's lack of support, while Kat thanks him for his unexpected help; Leslie tells Marcel there's a looming scandal that could rock Fairmont Crest.

A rare but deadly bacteria takes its toll on numerous victims around the city, leaving Chicago's finest first responders to work together alongside the CDC to resolve the dangerous situation; Severide suspects something bigger is happening.

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.

Kidd must prove herself at the National Firefighter Leadership Conference, while the rest of Firehouse 51 is called to two eerily similar car wrecks; Mouch tries to keep the firehouse informed by starting a newsletter; Cruz deals with a heartbreak.

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.

Cruz and Severide suspect foul play when a fire started by an elderly woman turns deadly. Kidd, Foster and Brett create a women's-only lounge. Firehouse 51 celebrates some good news.

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.

Severide must make a tough decision about the future of his career at Firehouse 51; Herrmann deals with the consequences of his temper; Cruz is excited to demonstrate the Slamigan at the Firefighting Expo; Commissioner Grissom returns.

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.

Severide starts off on the wrong foot at his Office of Fire Investigation assignment when, despite orders, he reopens an old case; Herrmann is on a mission to discover what caused an apartment fire; Kidd finds herself burning the candle at both ends.

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.

An unexpected visit throws Casey for a loop; Severide sets out to exonerate a wrongly convicted arsonist; Kidd pays the price for burning the candle at both ends; Cruz goes on a mission to fix one of Otis's old toys.

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.

Members of Firehouse 51 are dismayed to learn their boundaries have been redrawn to overlap with an adjacent station, and problems quickly arise; Casey and Gallo hunt a missing piece of equipment; Brett and Foster find themselves at odds.

Dr. Charles and Dr. Manning treat a patient who is fully invested in pretending to be someone other than himself; Noah doubts his abilities as a doctor; Dr. Marcel and Dr. Choi face a tough ethical decision; Dr. Halstead puts his faith in an addict.

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.

A rare but deadly bacteria takes its toll on numerous victims around the city, leaving Chicago's finest first responders to work together alongside the CDC to resolve the dangerous situation; Severide suspects something bigger is happening.

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.

Kidd must prove herself at the National Firefighter Leadership Conference, while the rest of Firehouse 51 is called to two eerily similar car wrecks; Mouch tries to keep the firehouse informed by starting a newsletter; Cruz deals with a heartbreak.

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.

Cruz and Severide suspect foul play when a fire started by an elderly woman turns deadly. Kidd, Foster and Brett create a women's-only lounge. Firehouse 51 celebrates some good news.

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.

Severide must make a tough decision about the future of his career at Firehouse 51; Herrmann deals with the consequences of his temper; Cruz is excited to demonstrate the Slamigan at the Firefighting Expo; Commissioner Grissom returns.

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.

Severide starts off on the wrong foot at his Office of Fire Investigation assignment when, despite orders, he reopens an old case; Herrmann is on a mission to discover what caused an apartment fire; Kidd finds herself burning the candle at both ends.

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.

An unexpected visit throws Casey for a loop; Severide sets out to exonerate a wrongly convicted arsonist; Kidd pays the price for burning the candle at both ends; Cruz goes on a mission to fix one of Otis's old toys.

Dr. Charles and Dr. Manning treat a patient who is fully invested in pretending to be someone other than himself; Noah doubts his abilities as a doctor; Dr. Marcel and Dr. Choi face a tough ethical decision; Dr. Halstead puts his faith in an addict.

Members of Firehouse 51 are dismayed to learn their boundaries have been redrawn to overlap with an adjacent station, and problems quickly arise; Casey and Gallo hunt a missing piece of equipment; Brett and Foster find themselves at odds.

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.

A rare but deadly bacteria takes its toll on numerous victims around the city, leaving Chicago's finest first responders to work together alongside the CDC to resolve the dangerous situation; Severide suspects something bigger is happening.

In Harlem, N.Y., a couple discovers it's not better to have the upstairs apartment.

Sixteen years after a college student is found raped and strangled on a buffalo bike path, DNA technology and other clues help catch the killer.

After his escape from a prison transport, the unit pursues a man accused of killing his child.

In Harlem, N.Y., a couple discovers it's not better to have the upstairs apartment.

Sixteen years after a college student is found raped and strangled on a buffalo bike path, DNA technology and other clues help catch the killer.

After his escape from a prison transport, the unit pursues a man accused of killing his child.

In Harlem, N.Y., a couple discovers it's not better to have the upstairs apartment.

After his escape from a prison transport, the unit pursues a man accused of killing his child.

Anita reluctantly shows Bill some grace; Hayley worries her husband's bloodwork could reveal her deadly scheme; Chelsea and Kat discuss their rocky romantic relationships, while Joey and Vanessa clash over theirs.

After a victim of the apartment fire that changed Bobby's life resurfaces, he searches to make amends; driven by his need to right past wrongs, Bobby delves deep into memories of his childhood, unearthing moments from his fractured past.

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.

The 118 and Tommy are presented with the Medal of Valor for their work on the cruise ship rescue; Hen and Karen encounter an unforeseen hurdle in their foster care journey; Eddie's emotional affair develops further.

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.

Following the devastating fire at the Nash home, Bobby's fate remains uncertain; Athena embarks on a mission to uncover the truth; Hen and Karin engage in a heated custody battle; Christopher grapples with forgiving Eddie.

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.

Emergency response providers put their lives at risk to save others.

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.

A night at an amusement park takes a deadly turn when a roller coaster malfunction leaves lives hanging in the balance; Abby reaches out to Buck; Athena and Hen respond to an unusual home invasion.

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.

Bobby and his team respond to an emergency at a children's birthday party; the crew jumps into action after one of their own is involved in a devastating accident; Athena tries to cope with a tragedy that hits way too close to home.

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.

Bobby and the team race to help the survivors of a deadly plane crash; Athena deals with chaos at the airport; Bobby confronts his past demons; Athena is out for revenge against teen bullies; Abby delivers an important message from a 9-1-1 caller.

Dr. Charles and Dr. Manning treat a patient who is fully invested in pretending to be someone other than himself; Noah doubts his abilities as a doctor; Dr. Marcel and Dr. Choi face a tough ethical decision; Dr. Halstead puts his faith in an addict.

After a victim of the apartment fire that changed Bobby's life resurfaces, he searches to make amends; driven by his need to right past wrongs, Bobby delves deep into memories of his childhood, unearthing moments from his fractured past.

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.

The 118 and Tommy are presented with the Medal of Valor for their work on the cruise ship rescue; Hen and Karen encounter an unforeseen hurdle in their foster care journey; Eddie's emotional affair develops further.

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.

Following the devastating fire at the Nash home, Bobby's fate remains uncertain; Athena embarks on a mission to uncover the truth; Hen and Karin engage in a heated custody battle; Christopher grapples with forgiving Eddie.

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.

Emergency response providers put their lives at risk to save others.

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.

A night at an amusement park takes a deadly turn when a roller coaster malfunction leaves lives hanging in the balance; Abby reaches out to Buck; Athena and Hen respond to an unusual home invasion.

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.

Bobby and his team respond to an emergency at a children's birthday party; the crew jumps into action after one of their own is involved in a devastating accident; Athena tries to cope with a tragedy that hits way too close to home.

Dr. Charles and Dr. Manning treat a patient who is fully invested in pretending to be someone other than himself; Noah doubts his abilities as a doctor; Dr. Marcel and Dr. Choi face a tough ethical decision; Dr. Halstead puts his faith in an addict.

Bobby and the team race to help the survivors of a deadly plane crash; Athena deals with chaos at the airport; Bobby confronts his past demons; Athena is out for revenge against teen bullies; Abby delivers an important message from a 9-1-1 caller.

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.

After a victim of the apartment fire that changed Bobby's life resurfaces, he searches to make amends; driven by his need to right past wrongs, Bobby delves deep into memories of his childhood, unearthing moments from his fractured past.

The building of a backyard shed destroys a yearslong, close relationship between two neighbors and ignites a vicious conflict that sees property destroyed, pets killed, and finally two people shot to death in cold blood.

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

While investigating gunshots in a fancy neighborhood, the team is confronted by a group of dangerous gun runners.

The building of a backyard shed destroys a yearslong, close relationship between two neighbors and ignites a vicious conflict that sees property destroyed, pets killed, and finally two people shot to death in cold blood.

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

While investigating gunshots in a fancy neighborhood, the team is confronted by a group of dangerous gun runners.

The building of a backyard shed destroys a yearslong, close relationship between two neighbors and ignites a vicious conflict that sees property destroyed, pets killed, and finally two people shot to death in cold blood.

While investigating gunshots in a fancy neighborhood, the team is confronted by a group of dangerous gun runners.

Bill's sudden collapse grips Hayley with fear; an impromptu massage leaves Nicole more tempted than she expected; Dani serves as a much-needed sounding board for her niece; Ashley and Derek reach an agreement.

After a victim of the apartment fire that changed Bobby's life resurfaces, he searches to make amends; driven by his need to right past wrongs, Bobby delves deep into memories of his childhood, unearthing moments from his fractured past.

The 118 and Tommy are presented with the Medal of Valor for their work on the cruise ship rescue; Hen and Karen encounter an unforeseen hurdle in their foster care journey; Eddie's emotional affair develops further.

Following the devastating fire at the Nash home, Bobby's fate remains uncertain; Athena embarks on a mission to uncover the truth; Hen and Karin engage in a heated custody battle; Christopher grapples with forgiving Eddie.

Emergency response providers put their lives at risk to save others.

A night at an amusement park takes a deadly turn when a roller coaster malfunction leaves lives hanging in the balance; Abby reaches out to Buck; Athena and Hen respond to an unusual home invasion.

Bobby and his team respond to an emergency at a children's birthday party; the crew jumps into action after one of their own is involved in a devastating accident; Athena tries to cope with a tragedy that hits way too close to home.

Bobby and the team race to help the survivors of a deadly plane crash; Athena deals with chaos at the airport; Bobby confronts his past demons; Athena is out for revenge against teen bullies; Abby delivers an important message from a 9-1-1 caller.

After a victim of the apartment fire that changed Bobby's life resurfaces, he searches to make amends; driven by his need to right past wrongs, Bobby delves deep into memories of his childhood, unearthing moments from his fractured past.

The 118 and Tommy are presented with the Medal of Valor for their work on the cruise ship rescue; Hen and Karen encounter an unforeseen hurdle in their foster care journey; Eddie's emotional affair develops further.

Following the devastating fire at the Nash home, Bobby's fate remains uncertain; Athena embarks on a mission to uncover the truth; Hen and Karin engage in a heated custody battle; Christopher grapples with forgiving Eddie.

Emergency response providers put their lives at risk to save others.

A night at an amusement park takes a deadly turn when a roller coaster malfunction leaves lives hanging in the balance; Abby reaches out to Buck; Athena and Hen respond to an unusual home invasion.

Bobby and his team respond to an emergency at a children's birthday party; the crew jumps into action after one of their own is involved in a devastating accident; Athena tries to cope with a tragedy that hits way too close to home.

Bobby and the team race to help the survivors of a deadly plane crash; Athena deals with chaos at the airport; Bobby confronts his past demons; Athena is out for revenge against teen bullies; Abby delivers an important message from a 9-1-1 caller.

After a victim of the apartment fire that changed Bobby's life resurfaces, he searches to make amends; driven by his need to right past wrongs, Bobby delves deep into memories of his childhood, unearthing moments from his fractured past.