A series of mysterious gas leaks has members of Firehouse 51 puzzled and spread thin. Brett’s conflicted when her birth mother gets serious about tracking her down. Severide misunderstands his role as Cruz’s best man. Mouch bites off more than he can chew.

The episode was rated 7.85 from 731 votes.

When one of 51's own gets injured on a call, Lt. Severide becomes obsessed with helping out. Foster contemplates a big decision. Kidd is concerned for one of her high school trainees.

The episode was rated 7.86 from 668 votes.

Tension builds when a group of rabble-rousers attempt to lock down the firehouse. Brett is faced with a monumental decision. Cruz readies himself for a big day. Gallo and Ritter attempt to launch Firehouse 51 into the social media age.

The episode was rated 7.86 from 695 votes.

A series of false alarms at a private school hinders the firehouse's ability to respond to legitimate emergency calls. Kidd asks for ideas to surprise Severide on his birthday. Cruz and Brett rent out their extra room, but the new tenant is more than they bargained for.

The episode was rated 7.86 from 749 votes.

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 episode was rated 7.87 from 831 votes.

Boden is on edge after starting a new fad diet. Casey and Severide disagree on a call. Brett’s birth mother shares life-altering news. A familiar face has a proposition for Herrmann.

The episode was rated 7.88 from 691 votes.

Severide begins his assignment at the Office of Fire Investigation and gets off on the wrong foot when, despite his orders, he reopens an old case. When the cause of an apartment fire hits close to home, Herrmann is on a mission to get to the bottom of it. Kidd finds herself burning the candle at both ends.

The episode was rated 7.89 from 731 votes.

Brett and Foster question the suspicious circumstances surrounding a brutal attack at a juvenile detention center, which leaves them searching for the truth. A convoluted new technology installed inside Firehouse 51 tests everybody’s patience. Kidd gets chosen to represent the district at a leadership conference.

The episode was rated 7.89 from 845 votes.

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 everyone in the firehouse informed by starting a newsletter, but things quickly get out of hand. Cruz deals with a heartbreak.

The episode was rated 7.89 from 842 votes.

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.

The episode was rated 7.91 from 750 votes.

A pest control problem forces the 51 team to temporarily bunk with Firehouse 20. All under the same roof, Casey clashes with Capt. Delaney while Foster, Kidd and Brett fear Capt. Leone has it out for them. Boden mulls a procedural overhaul.

The episode was rated 7.92 from 770 votes.

Lt. Casey struggles to get Chief Boden to sign off on an energetic new recruit. Against her better judgment, 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.

The episode was rated 7.94 from 898 votes.

The surprising arrival of a new fire truck brings both joy and chaos to members of Firehouse 51. Boden and Severide are asked to make peace with an old foe for the greater good. Brett receives family news while Foster plans a party with friends.

The episode was rated 7.96 from 759 votes.

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. Following a fire at a local university that ties into the outbreak, Severide has suspicions that something bigger is happening. The crossover continues on Chicago Med S05E04 Infection, Part II (II) and Chicago P.D. S07S04 Infection, Part III (III).

The episode was rated 7.98 from 927 votes.

In the latest episode of Chicago Fire, titled "Sacred Ground," the intensity reaches new heights as the team faces a devastating mattress factory fire. As the flames rage on, the situation quickly spirals out of control, putting the lives of numerous individuals at risk. With lives hanging in the balance, Truck and Squad bravely step up, willing to put everything on the line in a desperate attempt to rescue the trapped victims.

The emotional impact of this episode cannot be overstated. Viewers were left misty-eyed and moved by the events that unfolded. The loss of beloved character Otis had fans in tears, mourning his absence and feeling the void he left behind. The sacrifices made by the characters in this episode struck a chord, leaving many speechless and emotionally invested in the show.

Despite the heart-wrenching moments, the enduring love for Chicago Fire remains intact. Fans expressed their continued admiration for the series, even in the face of heartbreaking events. The dedication and passion exhibited by the characters and the compelling storylines are what keep viewers coming back for more, proving that this show still holds a special place in the hearts of its loyal audience.

The episode was rated 8.20 from 952 votes.