|I Am The Apocalypse|
|Season 0, Episode 0|
|Air date||April 7, 2015|
|Story by||Dick Wolf & Matt Olmstead|
|Teleplay by||Michael Brandt & Derek Haas|
|Directed by||Joe Chappelle|
"The team transports victims of a chemical leak to Chicago Memorial, where the bad situation turns even worse due to a grenade-carrying madman who claims to have a deadly airborne disease. After the explosion everybody starts to panic and begin to flee with the doctors telling everyone to stay put and puts Chicago Memorial on lock down. Also, Severide is seriously injured and is forced to have emergency surgery, during the surgery Severide has flashbacks about his days with Shay. "
Photos source: NBC