Daniel Kyri

Following the subway tunnel collapse, Ruzek and Kidd treat injured passengers and track down the missing offender; Archer and Frost perform a life-saving amputation; Lenox feels the weight of the CPD's hopes as she fights to save one of their own.

The mattress factory fire spirals out of control. The truck and squad lay it on the line in hopes of getting the trapped victims out alive.

Casey struggles to get Boden to sign off on an energetic new recruit; Foster extends an olive branch to her irritating new medic; Otis inspires Herrmann to seek new partners at Molly's; Brett realises life in Fowlerton will take some getting used to.

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.

Severide and Kidd continue to investigate Benny's old arson case; unexpected news leads Brett to ponder a big decision and all hell breaks loose.

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.