Anthony Ferraris

Dawson and Casey's relationship becomes all the more strained when Dawson breaks protocol during a call-out to a dangerous chemical spill.

Kelly is a law unto himself in his pursuit of Katie's kidnapper, while Dawson's grudge against Rebecca grows when she joins Firehouse 51.

Carver deals with the fallout of his arrest. Brett searches for closure with the baby she rescued. Capp weasels his way into the Firehouse 51 group chat.

The big wedding day arrives and Firehouse 51 welcomes Casey back to celebrate the joyous occasion; Emma's plans to replace Violet come to a shocking end.

Brett waits for life-changing news; Herrmann encounters a psychic with a grave warning on a call; Kidd finds a new lead on the Homeland Security case.

A warehouse blaze puts the fire and rescue squad at risk, Dawson's father overstays his welcome at Dawson and Casey's home, Casey fights for his first responders bill, Mouch makes a serious decision, and Herrmann tries to make a young boy smile.