Watch Chicago Fire Online: Season 4 Episode 1

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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.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.

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Chicago Fire Season 4 Episode 1 Quotes

Otis: Candidate's late on his first day?
Mouch: Now that takes gumption.

Patterson: I'd like you to remain with the company. Your reputation as a firefighter is not in question.
Severide: No, just my ability to lead.