DuShon Monique Brown

Kelly is a law unto himself in his pursuit of Katie's kidnapper, while Dawson's grudge against Rebecca grows when she joins Firehouse 51.

Severide springs into action when gunmen open fire on the subway. Gabby Dawson learns a harsh lesson on her first day as a firefighter.

Cruz comes under investigation when Firehouse 51 and Truck 66 collide, placing Molina in a critical condition.

Casey finds himself in dangerous territory when working undercover to bring down a trafficking ring. Also, Dawson realises that her life is about to change, and a new candidate makes an unusual first impression.

A call to the field may throw a wrench in Dawson's plan to retake the firefighter exam; the firehouse welcomes a new addition; Boden makes a bold move.

Tension between Severide and Captain Patterson finally reaches boiling point, meanwhile Cruz is visited by an old friend of his brother.