Welcome back to The Windy City, folks.
On Chicago Fire Season 4 Episode 1, Casey found himself in a dangerous situation while working undercover to bring down a trafficking ring that was being run out of Nesbitt's club.
Elsewhere, the squad's high turnover rate resulted in a surprise for Severide... one he wasn't exactly a fan of.
Meanwhile, Dawson became aware that that her life was about to change; a new candidate made an unusual first impression; and residents came together to protest a drug den in their neighborhood.
Click on the above video to watch Chicago Fire online and to see how this all transpired now.