S5, E2: Casey (Jesse Spencer) and Dawson (Monica Raymund) find themselves unexpectedly caught in the middle of a potential political mess. Stella (Miranda Rae Mayo) is left to make a serious decision about her ex-boyfriend. While responding to an auto accident, members of truck and squad find themselves in the middle of a dangerous situation. Elsewhere, Severide (Taylor Kinney) befriends a famous socialite (guest star Scott Elrod) that might distract him from his duties at 51, while Brett (Kara Killmer) and Mouch (Christian Stolte) set aside their writing differences for the greater good.