
Firehouse 51 faces the fallout of the warehouse fire and the team welcomes a new crop of probies into the fold.

Violet and Novak grow suspicious of a mental health facility after treating an escaped patient. Severide feels heat coming down from HQ.

A mistake in the field lands a firefighter in the hospital. Herrmann looks to get one of their own back on track.

The FBI recruits Severide when an arson is staged to cover up the kidnapping of a judge's daughter.

In the milestone 300th episode of the series, Firehouse 51 responds to a complex hostage situation. Cruz continues to make strides. Chief Tomlin gives Severide an impossible task.
The probies take on their last day at Firehouse 51 when Kidd receives shocking news; Violet and Novak begin fundraising for the Joint Duty Program and receive a surprising donation.