S6, E11: After responding to a time sensitive rescue, Casey (Jesse Spencer) and Severide (Taylor Kinney) don't see eye to eye on the best course of action. Herrmann (David Eigenberg) struggles to entertain his daughter on "bring your child to work day." Brett (Kara Killmer) is joined by a surprise guest during a spa getaway, courtesy of Dawson (Monica Raymund), while Kidd's (Miranda Rae Mayo) social life gets a boost.