Kris Wolff

Pilot. When a fire claims one of their own, there's plenty of guilt and blame to go around. Lt. Matthew Casey (Jesse Spencer), in charge of the Truck, tries to carry on, but clashes with the brash Lt. Kelly Severide (Taylor Kinney) of the Rescue Squad - and each blames the other for their fallen team member.

Defcon 1. Severide is convinced he knows the arsonist's identity.

Gaffney is thrown into chaos when a prison riot overwhelms the E.D.; Goodwin and Charles prepare for a high-stakes board meeting.

The police department battles escalating violence during record-breaking summer heat; Teresa finds herself back in the field; a boy witnesses his father being killed.