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- Season 4 overviewOct 13, 2015-May 17, 201623 episodesSeason 4 episodes23. Superhero May 17, 2016
- Lt. Boden and Jimmy are at odds in the aftermath of recent events; Kidd must deal with her ex.
- 22. Where the Collapse Started May 10, 2016
- A building collapses and leaves dozens trapped; Chief Boden faces a life-or-death decision.
- 21. Kind of a Crazy Idea May 3, 2016
- Dawson risks her life to save a boy from a fire; Severide wants to upgrade the house's fire masks.
- 20. The Last One for Mom Apr 26, 2016
- Holloway testifies in court as part of an undercover operation; an art gallery fire traps a victim.
- 19. I Will Be Walking Apr 19, 2016
- Casey attempts to use political influence to remedy a gang retribution incident.
- 18. On the Warpath Apr 5, 2016
- A call takes a bad turn when Brett witnesses a murder while aiding a victim who has a leg wound.
- 17. What Happened to Courtney Mar 29, 2016
- The remains of a baby's body found inside a home's chimney leads Severide to a case from his past.
- 16. Two Ts Feb 23, 2016
- A propaganda attack causes Casey to reconsider his run for alderman; a kidnapping investigation.
- 15. Bad for the Soul Feb 16, 2016
- Firehouse 51 responds to an unusual call from another firehouse; a new firefighter.
- 14. All Hard Parts Feb 9, 2016
- Chili does not respond well when Severide tries to talk to her about her erratic behavior.
- 13. The Sky Is Falling Feb 2, 2016
- News of a mass shooting brings the members of Firehouse 51 into harrowing territory.
- 12. Not Everyone Makes It Jan 26, 2016
- Herrmann is tormented by a decision; Severide helps with a case regarding homemade explosives.
- 11. The Path of Destruction Jan 19, 2016
- The city prepares for a tornado; Brett is forced to go to Boden about Chili's erratic behavior.
- 10. The Beating Heart Jan 5, 2016
- A member of Firehouse 51 is treated for life-threatening injuries; Cruz searches for Freddie.
- 9. Short and Fat Dec 8, 2015
- Members of Firehouse 51 are unhappy when Patterson fills in for Boden.
- 8. When Tortoises Fly Dec 1, 2015
- Patterson questions Boden's ability to lead the firehouse as the trial approaches.
- 7. Sharp Elbows Nov 24, 2015
- Boden thinks he's being set up by his neighbor; Severide's father pays him an unexpected visit.
- 6. 2112 Nov 17, 2015
- Chief Boden's new neighbor asks him for a favor; tension escalates between Severide and Patterson.
- 5. Regarding This Wedding Nov 10, 2015
- Boden steps up to host a neighborhood wedding that was ruined by a fire.
- 4. Your Day Is Coming Nov 3, 2015
- The members of the firehouse band together to help one of their own.
- 3. I Walk Away Oct 27, 2015
- New evidence appears in the internal affairs investigation that can clear Chief Boden.
- 2. A Taste of Panama City Oct 20, 2015
- Boden's job is on the line in the wake of a complicated call; Severide struggles to adjust.
- 1. Let It Burn Oct 13, 2015
- Casey is in dangerous territory; a protest hinders the firefighters attempt to battle a blaze.