DuShon Monique Brown

Cruz comes under investigation when Firehouse 51 and Truck 66 collide, placing Molina in a critical condition.

Chief Boden unwillingly agrees to let Dawson and Brett go undercover; Kidd and Zach's relationship hits a bump; Cruz has a hard time expressing his true feelings for Brett.

Casey finds himself in dangerous territory when working undercover to bring down a trafficking ring. Also, Dawson realises that her life is about to change, and a new candidate makes an unusual first impression.

Detective Lindsay calls in suspects in the disappearance of Katie's kidnapper, Jones struggles to fit in, and Herrmann celebrates his 20th wedding anniversary.

Evidence found at a fire points towards an arsonist who has evaded capture for a decade. Dawson puts her life on the line.

After responding to a car accident, Casey and Dawson become sceptical of a domineering husband's treatment of his injured wife.