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How Does It End? - Truck and squad clash after a tense call rescuing a doomsday prepper; Herrmann struggles with Cindy's diagnosis; Violet gives Brett and Gallo dating advice.

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A Guy I Used to Know - Firehouse 51 prepares for their semi-annual firehouse inspection. Brett fights to save her paramedicine program. Commander Martin Pearce asks Severide for a favor.

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Something for the Pain - Det. Pryma's case comes to an explosive end with Kidd and Carver's lives in danger. Brett installs an infant Safe Surrender Box at 51. Violet is determined to take Emma down.

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Nemesis - Severide struggles with the cost of helping Det. Pryma with the Martucci case. Gallo campaigns for Herrmann to represent 51 at the National Firefighter's Association's Winter Conference. A familiar face makes a shocking return.

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A Beautiful Life - Detective Pryma asks for Severide's help on a case involving explosives. Gallo and Carver clash after Gallo improvises on a call. Violet encourages Brett to start dating again.

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Angry Is Easier - Herrmann is tasked with fulfilling a man's dying wish. Kidd reflects on her Girls on Fire program after one of her students graduates from the Fire Academy. A heckler harasses Firehouse 51.

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All-Out Mystery - 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.

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