Defcon 1

Lt. Severide has his strong ideas on who the serial arsonist is, but first needs to find proof to back up his suspicions. Meanwhile, Lt. Casey adjusts to his new lifestyle in the wake of recent events and Molly's bar is failing, much to the dismay of owners Hermann, Dawson and Otis. Elsewhere, Dawson goes out on a date with Jay Halstead, one of the bar regulars, and Mouch's campaign trail starts to get on track with the aid of Isabella, an old friend of Dawson's.

Chaon Cross

Heather Darden

Larisa Polonsky

Zoya

Michelle Forbes

Gail McLeod

John Hoogenakker

Lt. Spellman

Mike Starr

Arthur

Mena Suvari

Isabella

William Smillie

Hadley

Jeff Hephner

Jeff Clarke

Jesse Lee Soffer

Jay Halstead

Treat Williams

Benny Severide

Randy Flagler

Harold Capp