The show follows the lives of the firefighters and paramedics working at the Chicago Fire Department at the firehouse of Engine 51, Truck 81, Squad 3, Ambulance 61 and Battalion 25.
Casey is placed in a dangerous situation while working undercover to bring down a trafficking ring being run out of Nesbitt's club. The squad's high turnover rate results in an unwelcome surprise for Severide. In other events, Dawson recognizes that her life is about to change; a new candidate makes an unusual first impression; and residents band together to protest a drug den in their neighborhood.
Following her pregnancy announcement, Dawson takes a desk job to investigate fires. Severide struggles with his new role, and Casey continues his investigation into Nesbitt. Molly's is threatened with closure following a noise complaint from new neighbors.
51 receives a call in the same troubled neighborhood. A man with a crushed leg leads to his wife giving Boden evidence of the previous incident that could clear Boden's name. Candidate Jimmy Borrelli's (guest star Steven R. McQueen) brother meddles in trying to get him moved into a different house. Dawson looks into an arson investigation that puts Boden in hot water. Brett gets attached to a victim of a previous call. Dawson suddenly suffers from abdominal pain and collapses.
Dawson is rushed into emergency surgery following her collapse. In honor of Dawson, Severide and Boden seek to help close her arson case. Molly's receives a notice of closure following a code violation. Dawson loses the baby leaving her and Matt devastated. Borrelli seeks the help from his cousin who works in construction to help get Molly's back open. Severide, with the help of Patterson, investigates how the OFI files got deleted. Ambo 61 responds to a call at the county morgue. It turns out that Duffy had the files; he jumps off a bridge holding a weight and Kelly goes in after him.
51 receives a call to a fire at a house where a wedding was about to take place but the groom is rushed to the hospital trying to save his bride. Later, Dawson, Brett, and Chili have an idea to host the wedding at the firehouse, which Chief Boden at first doesn't agree with. Meanwhile, Dawson is cleared to return to work as a firefighter, but Riddle tells her he doesn't want her to. Also, Boden's leadership is questioned by Riddle. Severide and Patterson fight both inside and outside the Firehouse, leaving everyone worried about Severide's future at 51.
Tensions only get worse between Patterson and Severide when Severide makes a call at a job without his consent causing Patterson to question Severide's future at 51. Borelli and Chili take their romance to the next level; Cruz receives a visit from one of his brother Leon's old gang members. Mouch receives tickets from one of the members of the rock band Rush and Boden and his wife Donna welcome a new neighbor who turns out to be overly friendly.
Boden could face criminal assault charges following an incident with his neighbor which leads to Voight helping out. Meanwhile, tensions continue with Captain Patterson which leads to Severide's father obtaining information that could bring Patterson down. Chili and Borelli continue their romance; Otis asks out Brett to the Chicago Fire Department gala; and Cruz helps out an old friend.
Boden's situation goes from bad to worse after Donna confronts their neighbor who is later reported missing. Detective Wheeler searches his home. A state attorney stops by 51 to see Boden about the Maddox case. This conversation puts Boden on to the possibility that Maddox is the one setting him up which is later confirmed when Boden confronts him. During a call, Hermann rescues a tortoise that he believed was a "robot". Mouch takes a liking to the animal and they find out it belongs to a John Doe to whom Chili and Brett had been called. Another call has Truck and Squad dealing with a Peeping Tom trapped in the ventilation system at a local gym. He tries to escape from the roof, but is tackled by Severide. Chili is late to shift and given "strike one" by Boden. Jimmy later finds Chili's apartment in disarray and she appears to be intoxicated. When he asks her what is going on, she avoids the issue by seducing him. After shift at Molly's, the crew relax until Wheeler shows up and officially arrests Boden.
Following Boden's arrest, Patterson is promoted to chief of Firehouse 51 much to everyone's dismay. Later on, Patterson sets new rules for the house that makes everyone uncomfortable, especially Chili and Borelli. Meanwhile, Severide continues to help strengthen Boden's case. Also, Dawson receives heat at a previous call when she gets into an outburst with a citizen and the outburst is recorded. Finding the woman who set Boden up, police get her to turn against the builder hoping to ruin the chief and Boden is exonerated. Patterson sees the light, especially after seeing 51's crew disarm a dangerous situation involving a hydrogen tank leak, and willingly restores command of 51 to Boden. He also tells off the meddlesome District Chief Riddle. During a celebratory party at Molly's, Hermann gets stabbed.
Hermann is rushed to Chicago Med after being stabbed at Molly's by the young gangbanger he tried to rescue from that life. After losing a lot of blood, it is determined he needs emergency surgery. Feeling guilty about Hermann's present state, Cruz searches for Freddy to turn him in. Severide is reinstated as Lieutenant while Borelli grows more concerned about Chili's erratic behavior. Mouch considers finally proposing to Platt.
This episode begins a crossover with Chicago Med and Chicago P.D. that continues on "Malignant" and concludes on "Now I'm God". It is included on the Chicago Med Season 1 and Chicago P.D. Season 3 DVD sets.
The city of Chicago prepares for a dangerous tornado. Meanwhile, Hermann returns to 51 after his health scare, but his wife thinks it is too early for him to return. Chili's erratic behavior continues, and she calls out Borelli and almost kills a victim while at a call. Later on, the tornado hits a Chicago neighborhood. It is Hermann's neighborhood and concern grows for his family's safety. Also, Dawson helps Otis on how to find a date.
Brett turns to Boden for Chili's erratic behavior which could cost her job. Meanwhile, Hermann testifies against Freddy about his near fatal stabbing. Also, Casey helps out at the homeless shelter following the tornado devastation. Severide helps out an agent with a homicide case.
Chili's erratic behavior reaches another level when she asks Chief Boden to transfer Brett to another house after Brett discovers that Chili's behavior affected her in another house. Meanwhile, Firehouse 51 prepares for a terrorist threat in Chicago. Chili reveals the root of her drinking problem: her grief over her missing sister's overdose death. Elsewhere, Hermann signs Borelli up for a charity boxing match with the police and Casey investigates the missing money from the fundraiser that was supposed to help the citizens from the tornado.
Severide confronts Chili about her erratic behavior and drinking problem which leads to Boden forcing her out of 51. Meanwhile, Borelli and Antonio battle it out in the boxing ring. Casey considers running for alderman.
Note: Last appearance of Jessica "Chili" Chilton (Dora Madison)
Severide and Cruz investigate a call at a firehouse that might not be an accident. Meanwhile, following Chili's termination, Borelli is reassigned to ambulance 61 after a union rule pushes him out. Casey officially runs for alderman and asks everyone at 51 for their help. A new firefighter, Stella Kidd (Miranda Rae Mayo) is introduced as the new member of Truck 81.
Note: First appearance of Stella Kidd (Miranda Rae Mayo)
Casey's run for alderman takes a bad turn when billboards about his personal life go up. Meanwhile, Brett and Borelli investigate a possible kidnapping case with the help of Officer Sean Roman and Nurse Maggie Lockwood. Also, the guys at 51 try to throw Mouch a bachelor party, but Trudy's half brother takes charge of it. It is revealed that Severide and Kidd had an awkward past.
A decomposed body is found stuck in a chimney and Severide suspects that it might be a missing child. Meanwhile, Casey's campaign hits a minor snag when his opponent criticizes him for wanting to be both a fireman and an alderman at the same time, and Dawson throws a party for Casey at Molly's.
Brett gets mugged and her identity stolen while at a call. Meanwhile, Casey has his first week as elected Alderman, Mouch begins to get cold feet when his wedding nears. Also, Otis begins to regret not asking Brett out.
Casey deals with Alderman issues relating to a boy taking the heat for his brother's gang activities. Kidd and Hermann have a Bar Olympics to see who is the better bar manager. Also, Otis has bad bruising on his back and hip and goes to Dr. Halstead to get it checked out. Also, Severide deals with Detective Holloway's son who she keeps dropping off at the house, despite his apparent disinterest in fire fighters. Later, The house responds to a distillery fire. Also, Jimmy has an awkward situation with a patient.
Severide is forced into a difficult situation when he watches Detective Holloway's son while his mother is shot and killed. Meanwhile, Casey receives a bribe in the mail and immediately turns it into the police but then later faces the Board of Ethics. Also, Brett finds out that Otis doesn't want to know his diagnosis and Cruz feels guilty at a call.
Dawson begins to get attached to a foster child after saving him after a last call. Meanwhile, Severide looks into upgrades for Firehouse 51, but is hitting walls and asks Casey for his political help. Also, Brett and Cruz bring in Otis' grandmother in order to convince him to go to the hospital fearing the worst and Kidd pitches ideas for Molly's.
Boden makes a life or death call at a building collapse scene when Jimmy returns to rescue his brother. Later, Members of 51 and other first responders salute Jimmy's brother. Meanwhile, Dawson continues to pursue fostering Louie. While on medical leave, Otis meets his temporary replacement fearing that it might be permanent. Also, Casey and Antonio butt heads when he finds out that Casey is not helping Dawson out.
92
23
"Superhero"
Michael Brandt
Story by : Ian McCulloch & Michael A. O'Shea Teleplay by : Michael Brandt & Derek Haas
Borelli deals with the fallout of the death of his brother Danny and takes it out on Boden. Meanwhile, Dawson is forced to find an apartment so she can foster Louie, Kidd continues to deal with her ex-husband. Also, Casey travels to an Alderman conference and Otis returns to 51. At the end of the episode, Severide and Kidd return to her apartment, but do not notice that Kidd's ex-husband is hiding there with a knife.
Ratings
Viewership and ratings per episode of Chicago Fire season 4
