S6, E14: After responding to a car accident, Casey (Jesse Spencer) and Dawson (Monica Raymund) become skeptical when a domineering husband continues to answer for his injured wife. Cruz (Joe Minoso) becomes frustrated with Herrmann (David Eigenberg) and Mouch (Christian Stolte) when he discovers they have contacted people regarding his "Slamigan" invention without his knowledge. Kidd (Miranda Rae Mayo) uncovers something meaningful and important to Severide (Taylor Kinney) while Brett (Kara Killmer) discovers some potentially unsettling news.