Boden makes a decision that impacts the race for Deputy Commissioner.
Severide and Violet risk clashing with Paramedic Chief Robinson after Lennox makes a dangerous decision on a call.
Severide goes for an unexpected ride on Truck 81. Ritter's worlds collide when his secret cop boyfriend helps 51 track down Severide and the missing rig.
Severide steps in as ranking officer at 51. Kidd fights to save her Girls on Fire program.
Firehouse 51 is forced to share its space with Firehouse 17. Kidd and Herrmann fight over Ritter. An arson case tests Kidd and Severide's relationship. Firehouse 51 says goodbye to one of its own.