Chicago Fire - Season 4 (2015)

A member of Firehouse 51 requires the support of the whole team to recover from a near disaster.

Boden offers to host a wedding at the firehouse after a fire ruins the ceremony, but Chief Riddle is against it and his political aspirations cause friction among the firefighters.

Severide and Patterson's differences reach a boiling point, while a visitor from Cruz's past asks for a favor.

Boden finds himself in the middle of a fiasco concerning a female neighbor he believes is setting him up.

Patterson confronts Boden about his ability to lead the firehouse.

Clues to Serena's possible whereabouts are uncovered, while Captain Patterson has news for everyone.

While a member of Firehouse 51 falls victim to a near-fatal stabbing, the other firefighters rescue a woman who attempted to commit suicide.

The city of Chicago braces for a tornado.

Herrmann goes to court to testify against Freddie but when the perpetrators father reaches out to beg forgiveness for his sons malicious attack, a tormented Herrmann is left to figure out what to do. Following the aftermath of the recent tornado, Lt. Casey learns the makeshift shelter housing victims is on the brink of shutting down. At the request of Alderman Colin Becks Casey attends a fundraiser and is thrown into the spotlight, only to quickly discover that his good intentions might not have the impact he was hoping for. Dawson and Brett feel the repercussions ...

Mysterious threats begin to emerge throughout Chicago and the situation gets worse when news of a mass shooting brings Firehouse 51 into a dangerous scene.

Severide confronts Chili about her behavior, while Jimmy faces Antonio in the first annual "Battle of the Badges".

Severide and Cruz take matters into their own hands when Firehouse 51 responds to a suspicious call from a neighboring firehouse.

A citywide propaganda attack against Casey's run for alderman makes him reconsider his candidacy.

Severide and Cruz discover the remains of a case that may be connected to a case Severide worked on years ago.

Sylvie is threatened when she witnesses a murder.

Casey tries to use his political influence when a high school student is almost killed by a street gang.

Severide watches over Detective Holloway's son while she testifies in court as part of an undercover operation, but he's left to deal with the situation due to an unexpected turn of events.

Dawson risks her life to save a young boy from an apartment fire.

Firehouse 51 heads to the scene of a building collapse where dozens of lives are on the line.

Dawson hopes to foster Louie while a dangerous structure fire puts a member of Firehouse 51 in a dangerous situation.