Take a Knee (S05E18)

Casey (Jesse Spencer) discovers a new crack house on the block that is harboring a female junkie and goes to extreme measures to remedy the situation. Dawson (Monica Raymund) and Brett (Kara Killmer) get assigned a new trainee (Will Kiley) for the shift and the newbie gets the two in trouble when he surprises them during a harrowing call. Meanwhile, Severide (Taylor Kinney) gets an unexpected visit from his father, Benny (Treat Williams), and Herrmann (David Eigenberg) deals with family issues when his son Lee Henry (David VonKampen) gets into trouble at school. (iTunes)