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

Chicago Fire

51's Original Bell

Tension builds when a group of rabble-rousers attempts 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.

Light Things Up

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Severide teams up with Seager and the OFI when a motel structure fire turns suspicious; Firehouse 51 members become amateur sleuths following a Reddit post involving one of their own; Brett continues to get invested in her birth mother, Julie.

I'll Cover You

Things get personal for Casey and Gallo in the aftermath of a suburban house fire involving a mother and her young son; Herrmann campaigns for more respect; Kidd has an idea for giving back to her community.

Protect a Child

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 Tendency of a Drowning Victim

A series of teen opioid overdoses sees Severide partner with Sean Roman, but he begins to suspect there's more to the story than his old friend is telling him; Casey tries to be there for Brett as she considers her birth mother's offer to meet.

Off the Grid

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 finding her; Severide misunderstands his role as Cruz's best man; Mouch bites off more than he can chew.

Shut It Down

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.

A Chicago Welcome

A series of false alarms at a private school hinders 51's ability to respond to legitimate emergencies; Kidd asks for ideas to surprise Severide on his birthday; Cruz and Brett rent out their extra room but get more than they bargained for.

Then Nick Porter Happened

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.

Where We End Up

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.

Hold Our Ground

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.

Best Friend Magic

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As the courageous firefighters, rescue squad and paramedics of Chicago Firehouse 51 head first into danger, bravely fighting to save the people of their city from peril, they also forge deep, unbreakable bonds with each other.

S8 E16 | The Tendency of a Drowning Victim

E20 | 51's Original Bell

E19 | Light Things Up

E18 | I'll Cover You

E17 | Protect a Child

E16 | The Tendency of a Drowning Victim

E15 | Off the Grid

E14 | Shut It Down

E13 | A Chicago Welcome

E12 | Then Nick Porter Happened

E11 | Where We End Up

E10 | Hold Our Ground

E9 | Best Friend Magic