Severide steps in as ranking officer at 51. Kidd fights to save her Girls on Fire program. Cruz’s family is threatened when someone from Javi’s past resurfaces.

Firehouse 51 welcomes back some familiar faces and says goodbye to Brett. Violet scrambles to decorate Brett’s wedding venue. A call at the expo center takes a shocking turn.

Mouch builds a classic firetruck model for the Deputy District Chief but needs some assistance from Gallo and Ritter. Brett and Violet encounter multiple victims with a strange set of…

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…

Javi spends a couple of shifts at Firehouse 51. Kidd and Carver work together to help Carver’s former boss. As Hawkins and Violet’s relationship blossoms, Gallo turns his attention elsewhere.

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…

Severide steps in as ranking officer at 51. Kidd fights to save her Girls on Fire program. Cruz’s family is threatened when someone from Javi’s past resurfaces.

Firehouse 51 welcomes back some familiar faces and says goodbye to Brett. Violet scrambles to decorate Brett’s wedding venue. A call at the expo center takes a shocking turn.

Cruz forms a bond with a young immigrant boy he meets while fighting an apartment fire. Squad makes plans to prank the newest member of their team.

Severide and Kidd work with CPD regarding a suspicious car wreck. Hawkins and Violet’s relationship is in jeopardy. Chloe and Cruz adjust to a new family dynamic.

The big wedding day arrives and Firehouse 51 welcomes Casey back to celebrate the joyous occasion. Emma’s plans to replace Violet come to a shocking end.