Following his stint at the LAPD, Wesley returns to the DA's office where his past connects him to the team's investigation; Bailey and John have conflicting feelings over safety; Lucy grows suspicious of Seth.

A doctor connected to Voight is investigated after four patients with chemo overdoses are sent to Chicago Med; Platt and Burgess work to clear Roman's name.

After a mafia-related mass casualty, the team is tasked to keep the peace at the hospital; Lucy and Celina work together to investigate the suspects behind the attack; Tim and Aaron embark on a metro ops mission.

A teenage girl is violated during a home invasion; Voight helps a former acquaintance; Platt and Mouch receive upsetting news regarding their upcoming wedding.

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

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.

Cruz forms a bond with a young immigrant boy he meets while fighting an apartment fire; Squad makes plans to prank the newest member of their team; Hawkins and Violet struggle to keep their relationship a secret.

Ruzek's future with the unit is in question after a botched undercover job; a corpse is discovered in an SUV; Lindsay and Halstead move forward with their relationship.

Severide and Kidd work with CPD regarding a suspicious car wreck; Hawkins and Violet's relationship is in jeopardy; Chloe and Cruz adjust to a new family dynamic.

Ruzek's future with the unit is in question after a botched undercover job; a corpse is discovered in an SUV; Lindsay and Halstead move forward with their relationship.

Firehouse 51 must band together when one of its own is taken hostage.

Intelligence searches for a missing teen who they believe poses a threat to students at his school; Atwater wants to make a good impression on a police captain.

Firehouse 51 tackles a fire caused by a dropped jet engine, and one of their own is accused of a theft related to the incident; Kidd and Boden disapprove of Kylie's potential new love interest.

When Intelligence follows up on a tip about an upcoming drug trade, the team discovers a man's mutilated body; Burgess helps plan a surprise for Platt.

A family friend asks Herrmann for some advice on opening a bar; tensions run high between Emma and Violet; Kidd struggles to keep her team together.

A decapitated corpse found in Lake Michigan is connected to Voight's social circle; Roman makes a grave error; Antonio makes a decision that could impact Michelle's future -- without consulting Olinsky.

Mouch and Ritter work together to solve a murder mystery; Severide and Cruz tackle a food truck fire; Gallo goes to see Hawkins about Violet.

A doctor connected to Voight is investigated after four patients with chemo overdoses are sent to Chicago Med; Platt and Burgess work to clear Roman's name.

The big wedding day arrives and Firehouse 51 welcomes Casey back to celebrate the joyous occasion; Emma's plans to replace Violet come to a shocking end.

A teenage girl is violated during a home invasion; Voight helps a former acquaintance; Platt and Mouch receive upsetting news regarding their upcoming wedding.

Cruz forms a bond with a young immigrant boy he meets while fighting an apartment fire; Squad makes plans to prank the newest member of their team; Hawkins and Violet struggle to keep their relationship a secret.

Ruzek's future with the unit is in question after a botched undercover job; a corpse is discovered in an SUV; Lindsay and Halstead move forward with their relationship.

Severide and Kidd work with CPD regarding a suspicious car wreck; Hawkins and Violet's relationship is in jeopardy; Chloe and Cruz adjust to a new family dynamic.

Ruzek's future with the unit is in question after a botched undercover job; a corpse is discovered in an SUV; Lindsay and Halstead move forward with their relationship.

Firehouse 51 must band together when one of its own is taken hostage.

Intelligence searches for a missing teen who they believe poses a threat to students at his school; Atwater wants to make a good impression on a police captain.

Firehouse 51 tackles a fire caused by a dropped jet engine, and one of their own is accused of a theft related to the incident; Kidd and Boden disapprove of Kylie's potential new love interest.

When Intelligence follows up on a tip about an upcoming drug trade, the team discovers a man's mutilated body; Burgess helps plan a surprise for Platt.

A family friend asks Herrmann for some advice on opening a bar; tensions run high between Emma and Violet; Kidd struggles to keep her team together.

Colter is hired to find a teen girl who went missing from a friend's house during a tragic triple homicide.

Mouch and Ritter work together to solve a murder mystery; Severide and Cruz tackle a food truck fire; Gallo goes to see Hawkins about Violet.

A decapitated corpse found in Lake Michigan is connected to Voight's social circle; Roman makes a grave error; Antonio makes a decision that could impact Michelle's future -- without consulting Olinsky.

The big wedding day arrives and Firehouse 51 welcomes Casey back to celebrate the joyous occasion; Emma's plans to replace Violet come to a shocking end.

A concerned colleague discovers the remains of 28-year-old finance manager Cathy Marlow in an office bathroom.

Cruz forms a bond with a young immigrant boy he meets while fighting an apartment fire; Squad makes plans to prank the newest member of their team; Hawkins and Violet struggle to keep their relationship a secret.

Ruzek's future with the unit is in question after a botched undercover job; a corpse is discovered in an SUV; Lindsay and Halstead move forward with their relationship.

Severide and Kidd work with CPD regarding a suspicious car wreck; Hawkins and Violet's relationship is in jeopardy; Chloe and Cruz adjust to a new family dynamic.

Ruzek's future with the unit is in question after a botched undercover job; a corpse is discovered in an SUV; Lindsay and Halstead move forward with their relationship.

Firehouse 51 must band together when one of its own is taken hostage.

Intelligence searches for a missing teen who they believe poses a threat to students at his school; Atwater wants to make a good impression on a police captain.

Firehouse 51 tackles a fire caused by a dropped jet engine, and one of their own is accused of a theft related to the incident; Kidd and Boden disapprove of Kylie's potential new love interest.

When Intelligence follows up on a tip about an upcoming drug trade, the team discovers a man's mutilated body; Burgess helps plan a surprise for Platt.

A family friend asks Herrmann for some advice on opening a bar; tensions run high between Emma and Violet; Kidd struggles to keep her team together.

A decapitated corpse found in Lake Michigan is connected to Voight's social circle; Roman makes a grave error; Antonio makes a decision that could impact Michelle's future -- without consulting Olinsky.

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

A doctor connected to Voight is investigated after four patients with chemo overdoses are sent to Chicago Med; Platt and Burgess work to clear Roman's name.

A teenage girl is violated during a home invasion; Voight helps a former acquaintance; Platt and Mouch receive upsetting news regarding their upcoming wedding.

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

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

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

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

Sgt. Parker faces one of his toughest negotiations yet when the SRU tries to resolve a hostage situation at a bank, then finds that the suspect doesn't fit the original profile.

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

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

Cruz forms a bond with a young immigrant boy he meets while fighting an apartment fire; Squad makes plans to prank the newest member of their team; Hawkins and Violet struggle to keep their relationship a secret.

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

Severide and Kidd work with CPD regarding a suspicious car wreck; Hawkins and Violet's relationship is in jeopardy; Chloe and Cruz adjust to a new family dynamic.

Sgt. Parker faces one of his toughest negotiations yet when the SRU tries to resolve a hostage situation at a bank, then finds that the suspect doesn't fit the original profile.

Firehouse 51 must band together when one of its own is taken hostage.

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

Firehouse 51 tackles a fire caused by a dropped jet engine, and one of their own is accused of a theft related to the incident; Kidd and Boden disapprove of Kylie's potential new love interest.

Sgt. Parker faces one of his toughest negotiations yet when the SRU tries to resolve a hostage situation at a bank, then finds that the suspect doesn't fit the original profile.

A family friend asks Herrmann for some advice on opening a bar; tensions run high between Emma and Violet; Kidd struggles to keep her team together.

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

Mouch and Ritter work together to solve a murder mystery; Severide and Cruz tackle a food truck fire; Gallo goes to see Hawkins about Violet.

The big wedding day arrives and Firehouse 51 welcomes Casey back to celebrate the joyous occasion; Emma's plans to replace Violet come to a shocking end.

Cruz forms a bond with a young immigrant boy he meets while fighting an apartment fire; Squad makes plans to prank the newest member of their team; Hawkins and Violet struggle to keep their relationship a secret.

Severide and Kidd work with CPD regarding a suspicious car wreck; Hawkins and Violet's relationship is in jeopardy; Chloe and Cruz adjust to a new family dynamic.

Firehouse 51 must band together when one of its own is taken hostage.

Firehouse 51 tackles a fire caused by a dropped jet engine, and one of their own is accused of a theft related to the incident; Kidd and Boden disapprove of Kylie's potential new love interest.

A family friend asks Herrmann for some advice on opening a bar; tensions run high between Emma and Violet; Kidd struggles to keep her team together.

Natalie's plan to secure her daughter Jessica a spot on the national tumbling gymnastics team comes to fruition, at Kelly's expense; as Natalie's single-minded pursuit of success pushes Jessica into Adam's arms, Jessica is forced to make a decision.

Mouch and Ritter work together to solve a murder mystery; Severide and Cruz tackle a food truck fire; Gallo goes to see Hawkins about Violet.

The big wedding day arrives and Firehouse 51 welcomes Casey back to celebrate the joyous occasion; Emma's plans to replace Violet come to a shocking end.

Bumpy plans to build a new club in Harlem but must find a way to finance it without the heroin business; Elise testifies in the Malcolm X murder trial when three innocent men are accused; Stella negotiates a business deal between Colombo and Chin.

Cruz forms a bond with a young immigrant boy he meets while fighting an apartment fire; Squad makes plans to prank the newest member of their team; Hawkins and Violet struggle to keep their relationship a secret.

Bumpy must turn the Five Families against Chin when he violates their peace agreement; he tasks newcomer Frank Lucas with robbing a shipment of Gigante heroin; Elise learns of a plot to kill Omar; Stella makes a play to become boss of the family.

Severide and Kidd work with CPD regarding a suspicious car wreck; Hawkins and Violet's relationship is in jeopardy; Chloe and Cruz adjust to a new family dynamic.

Kidd recruits Carver, Capp and Tony to help prepare her new lieutenant's quarters; Severide and Detective Pryma reluctantly pair up to work a police investigation; Firehouse 51 comes together to fight a movie theater fire.

Firehouse 51 must band together when one of its own is taken hostage.

Kidd gets a glimpse into Carver's chaotic personal life; Mouch and Herrmann receive an unexpected gift.

Firehouse 51 tackles a fire caused by a dropped jet engine, and one of their own is accused of a theft related to the incident; Kidd and Boden disapprove of Kylie's potential new love interest.

Natalie's plan to secure her daughter Jessica a spot on the national tumbling gymnastics team comes to fruition, at Kelly's expense; as Natalie's single-minded pursuit of success pushes Jessica into Adam's arms, Jessica is forced to make a decision.

A family friend asks Herrmann for some advice on opening a bar; tensions run high between Emma and Violet; Kidd struggles to keep her team together.

Bumpy plans to build a new club in Harlem but must find a way to finance it without the heroin business; Elise testifies in the Malcolm X murder trial when three innocent men are accused; Stella negotiates a business deal between Colombo and Chin.

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

Bumpy must turn the Five Families against Chin when he violates their peace agreement; he tasks newcomer Frank Lucas with robbing a shipment of Gigante heroin; Elise learns of a plot to kill Omar; Stella makes a play to become boss of the family.

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

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

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

Sgt. Parker faces one of his toughest negotiations yet when the SRU tries to resolve a hostage situation at a bank, then finds that the suspect doesn't fit the original profile.

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

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

Sgt. Parker faces one of his toughest negotiations yet when the SRU tries to resolve a hostage situation at a bank, then finds that the suspect doesn't fit the original profile.

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

Sgt. Parker faces one of his toughest negotiations yet when the SRU tries to resolve a hostage situation at a bank, then finds that the suspect doesn't fit the original profile.

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

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.

Kidd and Severide's honeymoon is interrupted by a dangerous person from their past; Kidd's former academy classmate joins Firehouse 51; Brett and Violet reflect on their relationships.

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.

Javi spends a couple of shifts at Firehouse 51; Kidd and Carver work together to help Carver's former boss; as Hawkins and Violet's relationship blossoms, Gallo turns his attention elsewhere.

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.

Kidd recruits Carver, Capp and Tony to help prepare her new lieutenant's quarters; Severide and Detective Pryma reluctantly pair up to work a police investigation; Firehouse 51 comes together to fight a movie theater fire.

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.

Kidd gets a glimpse into Carver's chaotic personal life; Mouch and Herrmann receive an unexpected gift.

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.

Firehouse 51 hosts a Halloween open house; Kidd and Severide help a young girl after she gets kicked out of her home.

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.

Severide and Kidd investigate an explosion at a jewelry store; Cruz and Chloe take steps to make Javi a permanent part of their family; Gallo, Ritter and Mouch try to bond with Carver.

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.

Natalie's plan to secure her daughter Jessica a spot on the national tumbling gymnastics team comes to fruition, at Kelly's expense; as Natalie's single-minded pursuit of success pushes Jessica into Adam's arms, Jessica is forced to make a decision.

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.

Bumpy plans to build a new club in Harlem but must find a way to finance it without the heroin business; Elise testifies in the Malcolm X murder trial when three innocent men are accused; Stella negotiates a business deal between Colombo and Chin.

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.

Bumpy must turn the Five Families against Chin when he violates their peace agreement; he tasks newcomer Frank Lucas with robbing a shipment of Gigante heroin; Elise learns of a plot to kill Omar; Stella makes a play to become boss of the family.

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.

Kidd recruits Carver, Capp and Tony to help prepare her new lieutenant's quarters; Severide and Detective Pryma reluctantly pair up to work a police investigation; Firehouse 51 comes together to fight a movie theater fire.

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.

Kidd gets a glimpse into Carver's chaotic personal life; Mouch and Herrmann receive an unexpected gift.

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.

Natalie's plan to secure her daughter Jessica a spot on the national tumbling gymnastics team comes to fruition, at Kelly's expense; as Natalie's single-minded pursuit of success pushes Jessica into Adam's arms, Jessica is forced to make a decision.

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.

Bumpy plans to build a new club in Harlem but must find a way to finance it without the heroin business; Elise testifies in the Malcolm X murder trial when three innocent men are accused; Stella negotiates a business deal between Colombo and Chin.

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.

Bumpy must turn the Five Families against Chin when he violates their peace agreement; he tasks newcomer Frank Lucas with robbing a shipment of Gigante heroin; Elise learns of a plot to kill Omar; Stella makes a play to become boss of the family.

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.

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

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 a violent altercation with his father, a young man flees the police and runs into the woods, sending the team on a manhunt.

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

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 a violent altercation with his father, a young man flees the police and runs into the woods, sending the team on a manhunt.

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

After a violent altercation with his father, a young man flees the police and runs into the woods, sending the team on a manhunt.

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.

On Valentine's Day, a surprise marriage proposal goes awry with dangerous consequences; Athena attempts to help a desperate woman; Bobby and Chimney pull holiday duty; Abby and Buck go on their first official date.

A full moon keeps the crew busy with crazy calls; Athena investigates a potential home invasion; Abby helps investigate a caller's murder; Bobby and Buck have their hands full at a yoga studio for pregnant women; Hen's past may become her future.

Bobby gets a surprising phone call from his doctor after donating at Chimney's blood drive; Athena confronts Michael after having a heart-to-heart with their kids.

The first responders race to help a homeless man crushed in a garbage truck, a mother and son in a crashed elevator, and extreme hoarders trapped in their house; Athena starts dating; the situation with Abby's mother tests her relationship with Buck.

The first responders take calls involving an unusual domestic disturbance, a "death" at a psychic's place, and a motorcycle crash; Bobby dips his toes into the dating pool; Abby walks down memory lane, and Buck is confronted by his past actions.

On one of the hottest days of the year, the first responders must deal with harrowing incidents all around the city; Buck gets a surprise visit from his sister; Athena questions her relationship with Bobby; Buck worries about a handsome new hire.

After learning the truth, Maggie struggles to reconcile her unresolved feelings for Liam while helping Cal look for Ben and Tracy.

A massive earthquake rocks Los Angeles; the first responders rush to rescue victims from a crumbling high-rise hotel; Athena must deal with wreckage from a collapsed freeway overpass; Maddie faces her first crisis as a 911 dispatcher.

A full moon keeps the crew busy with crazy calls; Athena investigates a potential home invasion; Abby helps investigate a caller's murder; Bobby and Buck have their hands full at a yoga studio for pregnant women; Hen's past may become her future.

Bobby gets a surprising phone call from his doctor after donating at Chimney's blood drive; Athena confronts Michael after having a heart-to-heart with their kids.

The first responders race to help a homeless man crushed in a garbage truck, a mother and son in a crashed elevator, and extreme hoarders trapped in their house; Athena starts dating; the situation with Abby's mother tests her relationship with Buck.

The first responders take calls involving an unusual domestic disturbance, a "death" at a psychic's place, and a motorcycle crash; Bobby dips his toes into the dating pool; Abby walks down memory lane, and Buck is confronted by his past actions.

On one of the hottest days of the year, the first responders must deal with harrowing incidents all around the city; Buck gets a surprise visit from his sister; Athena questions her relationship with Bobby; Buck worries about a handsome new hire.

After learning the truth, Maggie struggles to reconcile her unresolved feelings for Liam while helping Cal look for Ben and Tracy.

On Valentine's Day, a surprise marriage proposal goes awry with dangerous consequences; Athena attempts to help a desperate woman; Bobby and Chimney pull holiday duty; Abby and Buck go on their first official date.

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

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 a violent altercation with his father, a young man flees the police and runs into the woods, sending the team on a manhunt.

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

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 a violent altercation with his father, a young man flees the police and runs into the woods, sending the team on a manhunt.

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

After a violent altercation with his father, a young man flees the police and runs into the woods, sending the team on a manhunt.

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.

On Valentine's Day, a surprise marriage proposal goes awry with dangerous consequences; Athena attempts to help a desperate woman; Bobby and Chimney pull holiday duty; Abby and Buck go on their first official date.

A full moon keeps the crew busy with crazy calls; Athena investigates a potential home invasion; Abby helps investigate a caller's murder; Bobby and Buck have their hands full at a yoga studio for pregnant women; Hen's past may become her future.

Bobby gets a surprising phone call from his doctor after donating at Chimney's blood drive; Athena confronts Michael after having a heart-to-heart with their kids.

The first responders race to help a homeless man crushed in a garbage truck, a mother and son in a crashed elevator, and extreme hoarders trapped in their house; Athena starts dating; the situation with Abby's mother tests her relationship with Buck.

The first responders take calls involving an unusual domestic disturbance, a "death" at a psychic's place, and a motorcycle crash; Bobby dips his toes into the dating pool; Abby walks down memory lane, and Buck is confronted by his past actions.

On one of the hottest days of the year, the first responders must deal with harrowing incidents all around the city; Buck gets a surprise visit from his sister; Athena questions her relationship with Bobby; Buck worries about a handsome new hire.

After learning the truth, Maggie struggles to reconcile her unresolved feelings for Liam while helping Cal look for Ben and Tracy.

A massive earthquake rocks Los Angeles; the first responders rush to rescue victims from a crumbling high-rise hotel; Athena must deal with wreckage from a collapsed freeway overpass; Maddie faces her first crisis as a 911 dispatcher.

A full moon keeps the crew busy with crazy calls; Athena investigates a potential home invasion; Abby helps investigate a caller's murder; Bobby and Buck have their hands full at a yoga studio for pregnant women; Hen's past may become her future.

Bobby gets a surprising phone call from his doctor after donating at Chimney's blood drive; Athena confronts Michael after having a heart-to-heart with their kids.

The first responders race to help a homeless man crushed in a garbage truck, a mother and son in a crashed elevator, and extreme hoarders trapped in their house; Athena starts dating; the situation with Abby's mother tests her relationship with Buck.

The first responders take calls involving an unusual domestic disturbance, a "death" at a psychic's place, and a motorcycle crash; Bobby dips his toes into the dating pool; Abby walks down memory lane, and Buck is confronted by his past actions.

On one of the hottest days of the year, the first responders must deal with harrowing incidents all around the city; Buck gets a surprise visit from his sister; Athena questions her relationship with Bobby; Buck worries about a handsome new hire.

After learning the truth, Maggie struggles to reconcile her unresolved feelings for Liam while helping Cal look for Ben and Tracy.

On Valentine's Day, a surprise marriage proposal goes awry with dangerous consequences; Athena attempts to help a desperate woman; Bobby and Chimney pull holiday duty; Abby and Buck go on their first official date.