Daniel Kyri

Vasquez fights to prove himself at 51. Violet and Novak pursue a troubling mystery. Herrmann is on a quest to keep Molly’s profitable.

Cruz leads the charge in getting the firehouse to gear up for the Polar Plunge, and Herrmann has a hard time bouncing back after dealing with a tough call. Plus, Foster's personal relationships begin to interfere with her job.

Brett, Foster and Kidd take a road trip to Indiana and encounter an accident involving a boys' hockey team that leaves them relying on their instincts to save the injured. Plus, the rest of Firehouse 51 competes in the annual chili cook-off.

Casey further investigates a motorcycle accident at the request of the victim's son. Meanwhile, Kidd, Foster, and Brett bond while helping Kidd fix a mistake, and Mouch and Otis have a falling out after Otis' teasing hits a sore spot.

Foster faces blowback after pointing out a doctor's oversight, Brett helps Casey look for a new apartment, and Kidd prepares Tuesday the Dalmatian for the Fire Safety Dog Competition. Plus, a serious accusation is levelled against Severide.

Firehouse 51 is thrown into chaos due to a series of mysterious gas leaks. Meanwhile, Brett struggles with feelings about her birth mother. Severide misunderstands his role as Cruz's best man and Mouch bites off more than he can chew.