S4, E12: Herrmann (David Eigenberg) goes to court to testify against Freddie (guest star Ralph Rodriguez), but when the perpetrator's father (guest star Ski Carr) reaches out to beg forgiveness for his son's malicious attack, a tormented Herrmann is left to figure out what to do. Following the aftermath of the recent tornado, Lt. Casey (Jesse Spencer) learns the makeshift shelter housing victims is on the brink of shutting down. At the request of Alderman Colin Becks (guest star Armand Schultz), Casey attends a fundraiser and is thrown into the spotlight, only to quickly discover that his good intentions might not have the impact he was hoping for. Dawson (Monica Raymund) and Brett (Kara Killmer) feel the repercussions after telling Boden (Eamonn Walker) about Chili's (Dora Madison) recent erratic behavior. Meanwhile, Severide (Taylor Kinney) helps Agent Alex Ward (guest star Liza Bennett) solve a homemade explosives case, and Otis (Yuri Sardarov) receives a welcome surprise.