Katelynn Shennett

Pacal finds himself under intense scrutiny when a member of the firehouse is injured on a call. Herrmann grapples with family issues.

Firehouse 51 deals with the aftermath of the capsized boat rescue; Gallo, Ritter and Violet discuss plans for a side gig.

Kidd and Severide's honeymoon is interrupted by a dangerous person from their past; Kidd's former academy classmate joins Firehouse 51; Brett and Violet reflect on their relationships.

Herrmann investigates the rise in missing fire hydrants and teams up with Kylie to track them down. Kidd’s cousin comes to town, revealing surprising family history. Violet and Novak treat the victim of a birthday cake smash gone awry.

A video of Casey from the roof rescue goes viral; Mouch sets up a Little Free Library at Firehouse 51; Herrmann breaks protocol.

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.