A horrible storm wreaks havoc on Chicago and impacts Firehouse 51 when the power goes off. A little boy mysteriously shows up at the station and everyone works together to uncover who he belongs to and why he ended up there. Foster and Kidd argue about Severide.

It’s a special day for Jamal and Kai, but drama might ruin it when AUSA’s Meghan Conway continues to pursue the Lyons by any means necessary. Meanwhile, Damon shows up, threatening to expose Cookie’s secret. Teri confides in Cookie, sharing a big secret. Andre asks Lucious for help with a life-altering task

With everything that has been going on, Jane reluctantly agrees to let Rogelio throw her a big 30th birthday party. Jane’s mentor gives her some important advice that may help her start writing again. Petra thinks she and JR are finally in a good place, until she realizes that JR might see things differently.

Actress Brie Larson; comic Wyatt Cenac; Wu-Tang Clan performs.

Lazslo, in bat form, is captured by Staten Island Animal Control and must be rescued, while Nadja can no longer resist reconnecting with her reincarnated lover Gregor.