One Chicago & The FBIs Wiki
I Am the Apocalypse
Season: 3
Episode: 19
Original airdate: April 7, 2015
Teleplay by: Derek Haas
Michael Brandt
Story by: Dick Wolf
Matt Olmstead
Directed by: Joe Chappelle
Episode chronology
Previous episode: Forgiving, Relentless, Unconditional
Next episode: You Know Where to Find Me


It's all hands on deck when Firehouse 51 races to the scene of a deadly chemical leak inside an industrial building. With squad and truck tested like never before, scores of workers are rescued but many are experiencing respiratory distress. This prompts truck 81, squad 3 and ambulance 61 to spring into action to transport the victims to nearby Chicago Med. The situation takes a turn from bad to worse in the midst of the chaos when a "patient" planted inside the hospital goes on a suicide mission armed with a grenade and claiming to be the carrier of a deadly airborne disease. Trying to stop the madman from engaging the explosive device, a member of the firehouse team is severely wounded in the blast and left to face life-threatening injuries. With no other choice, Chicago Med is forced into lockdown until doctors and the Hazmat team can determine the severity of the airborne virus.


Main Cast

Special Guest Stars

Guest Stars


  • Anthony Ferraris as Squad 3 Driver Tony Ferraris
  • Cayne Collier as Lowe
  • Ray Frewen as Jim
  • James Rana as Ali Mahmoud
  • Sarab Kamoo as Noor Mahmoud
  • Andy Nagraj as Aleem Mahmoud
  • Carisa Barreca as Registrar
  • Jennifer Weigel as Melissa Brosh-McKenna
  • Ada Grey as Ruby
  • Leslie Handelman as Ruby's Mother
  • Cole Millette as Melanie
  • Alanna Rogers as Female Patient
  • Paul Dunckel as Factory Supervisor


Background information and Notes

Chicago Fire season 3
Episodes AlwaysWow MeJust Drive the TruckApologies Are DangerousThe Nuclear OptionMadmen and FoolsNobody Touches AnythingChopperArrest in TransitSanta BitesLet Him DieAmbush PredatorThree BellsCall It ParadiseHeadlong Toward DisasterRed Rag the BullForgive You AnythingForgiving, Relentless, UnconditionalI Am the ApocalypseYou Know Where to Find MeWe Called Her JellybeanCategory 5Spartacus
Other Seasons Season 1Season 2Season 4Season 5Season 6Season 7Season 8Season 9Season 10