Original air date: 01/03/2017 Runtime: 42:21 min. Dawson (Monica Raymund) and Casey (Jesse Spencer) deal with legal matters in hopes of remaining Louie's legal guardians. Severide (Taylor Kinney) continues in his efforts for a bone marrow procedure to help Anna (guest star Charlotte Sullivan), but when things don't go as planned, he finds himself slipping back into old habits. Meanwhile, Brett (Kara Killmer) opens up to Dawson and members of Firehouse 51 become competitive, much to the dismay of Chief Boden (Eamonn Walker).
Original air date: 01/24/2017 Runtime: 40:56 min. Dawson (Monica Raymund) finds it hard to keep her emotions in check during an ambo run involving a pregnant teen. Elsewhere, the firehouse is called to the site of a building fire and Casey (Jesse Spencer) is forced to make a split second decision when two victims are each need of life saving assistance. In the aftermath, Casey is left to deal with the repercussions. Meanwhile, Severide (Taylor Kinney) shares a bond with Anna (guest star Charlotte Sullivan), as she makes her recovery.
Original air date: 02/07/2017 Runtime: 41:02 min. The team is on high alert when a previous incident during a fire call leaves a dangerous man on the loose with a vendetta to target Lt. Casey (Jesse Spencer) and Firehouse 51, and prompts CPD to step in. Dennis Mack (guest star Nick Boraine), a buddy firefighter of Severide's (Taylor Kinney) father, comes to town to shadow the squad but may have ulterior motives. Meanwhile, Brett (Kara Killmer) and Antonio's (guest star Jon Seda) relationship hits some bumps in the road when his ex-wife Laura (guest star America Olivo) surfaces and Casey has a present for Dawson (Monica Raymund).
Original air date: 02/14/2017 Runtime: 41:08 min. Chief Anderson feels his authority was undercut after Chief Boden makes a decision that overrides Anderson's when both squads respond to the scene of a dangerous accident; Severide ponders a lifechanging decision; Herrmann does a good deed.
Original air date: 02/21/2017 Runtime: 41:05 min. After exercising his disdain and authority over Chief Boden (Eamonn Walker), Chief Anderson (guest star Michael Hanrahan) reassigns members of 51 to various houses around town, citing the need for improvement. The ramifications are felt by the crew, who are left to make the best of their respective situations in their new surroundings. Boden fights to repair the situation, but it just might be out of his control. Elsewhere, Severide (Taylor Kinney) toils over an important decision.
Original air date: 03/01/2017 Runtime: 42:23 min. Truck and squad are called to aid in a massive all city response when an old, ill equipped factory turned live/work space quickly turns into a firestorm, trapping countless unsuspecting victims. The dire situation quickly turns personal when it is discovered that one of Chicago PD's own has a family member at the scene. With the rescued victims in need of serious medical attention, the doctors and nurses of Chicago Med are tested as the major influx of patients are brought through their doors. Meanwhile, in the aftermath, the building owner steps forward to cooperate with the ongoing investigation, but the situation takes a sudden and unexpected turn.
Original air date: 03/21/2017 Runtime: 41:07 min. When a turf war escalates, members of truck and squad find themselves caught in the middle as unsuspecting hostages when a group of armed gang members take cover and assume control over Firehouse 51. The situation turns even more dire when one of the infiltrators is wounded and in need of serious help.
Original air date: 03/28/2017 Runtime: 40:59 min. When similar car accidents uncover the fact that someone may be targeting innocent people, a determined Dawson (Monica Raymund) takes matters into her own hands to help push things along. Severide (Taylor Kinney) does everything he can to make Anna (guest star Charlotte Sullivan) feel welcome in her new Chicago surroundings. Herrmann (David Eigenberg), Kidd (Miranda Rae Mayo) and Dawson decide to have Molly's included as a stop in this year's pub crawl, despite strong concerns from Otis (Yuri Sardarov), who may have his own reasons for standing alone. Meanwhile, Casey (Jesse Spencer) tends to his Alderman's duties when a persistent constituent asks for his help in resolving an issue.
Original air date: 04/04/2017 Runtime: 41:04 min. Casey (Jesse Spencer) discovers a new crack house on the block that is harboring a female junkie and goes to extreme measures to remedy the situation. Dawson (Monica Raymund) and Brett (Kara Killmer) get assigned a new trainee (guest star Will Kiley) for the shift and the newbie gets the two in trouble when he surprises them during a harrowing call. Meanwhile, Severide (Taylor Kinney) gets an unexpected visit from his father, Benny (Treat Williams), and Herrmann (David Eigenberg) deals with family issues when his son Lee Henry (guest star David VonKampen) gets into trouble at school.
Original air date: 04/25/2017 Runtime: 42:47 min. When the squad's rig breaks down in the field, Casey (Jesse Spencer) reunites with his old friend and colleague Jason Kannell (guest star Kamal Angelo Bolden) from Squad 6, whose crew gets assigned a temporary change of quarters until the rig issue is resolved. Dawson (Monica Raymund) and Brett (Kara Killmer) serve their time in retraining, both tackling the class in unique ways. Severide (Taylor Kinney) tries to remedy what is going on with Anna (Charlotte Sullivan) and finds support from unlikely sources. As Connie (DuShon Monique Brown) returns from her family engagement, the crew lays bets on how long her temporary replacement Marcy (guest star Mia Hulen) will last.
Original air date: 05/02/2017 Runtime: 41:32 min. Casey (Jesse Spencer) goes to drastic measures to help his friend Kannell (guest star Kamal Angelo Bolden). Lt. Severide (Taylor Kinney) helps an old widow come to terms with letting go, but realizes he may be the one needing help. Otis (Yuri Sadarov) and Cruz (Joe Minoso) deal with surprises when they find a new roommate to move in. Dawson (Monica Raymund) and Brett (Kara Killmer) get crafty to save a young girl.
Original air date: 05/09/2017 Runtime: 42:47 min. Cruz (Joe Minoso) finds himself in a bad spot when an off duty incident begins to unravel, prompting Mouch (Christian Stolte) to step in and offer help in hopes of avoiding serious consequences from the CFD. Casey (Jesse Spencer) goes head to head with a big politician to get his measure for first responders passed. Lt. Severide (Taylor Kinney) makes life difficult for newest team member Jason Kannell (guest star Kamal Angelo Bolden) and Dawson (Monica Raymund) gets an unexpected visit from her father (guest star Daniel Zacapa).
Original air date: 05/16/2017 Runtime: 42:10 min. A dangerous warehouse fire puts truck and squad at risk. Tensions are high for Dawson (Monica Raymund) and Casey (Jesse Spencer) when Dawson's father (guest star Daniel Zacapa) overstays his welcome at their home. Meanwhile, Casey continues to fight for his first responders bill, Mouch (Christian Stolte) makes a serious decision regarding his future and Herrmann (David Eigenberg) goes to tremendous lengths to make a young boy smile.