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Severide pushes to have the serial arsonist charge while Clarke is under suspicion for being a mole inside the firehouse on Chicago Fire.
Severide must find proof to confirm his theory on the arsonist's identity while Casey must get used to a whole new lifestyle on Chicago Fire.
Severide tries to anticipate the next attack from the serial arsonist while Casey attempts to deal with the after effects of Heather's accident on Chicago Fire.
Chicago Fire starts its second season with Severide being targeted by an arsonist and Firehouse 51 faces the possibility of being closed for good.
On the season finale of Chicago Fire, the squad is faced with an unexpected and unstable situation at the Cook County Jail.
The House supports Molly's grand opening while Casey must deal with an unrepentant Voight on Chicago Fire
The squad must deal with an apartment building collapse while Severide fights the allegations against him, gaining him new enemies and allies on Chicago Fire.
Severide is accused of sexual misconduct on the job by a former paramedic while Dawson is asked to payback a favor on Chicago Fire.
Despite Severide's assistance, Mills must still overcome the resentment of the team when he decides to transfer to the squad on Chicago Fire.
When the team attempts a rescue at a tenement fire leads to a tragedy. Shay and Dawson have to handle a junkie while the rest of the team must deal with a local drug dealer on Chicago Fire.