Alison Severide is the twin sister of Kelly Severide. Being a firefighter is in their blood. And being a female firefighter hasn't been easy. Once they became friends with the police department Alison instantly fell for Detective Jay Halstead. They had a connection but there was only one thing, Jay is engaged.

Stella and Kelly have had an on-again-off-again relationship for awhile now. What will happen when Stella ends up pregnant? Will they finally admit their feelings for each other and come together to raise their child?

What happens when the flu hits? Will they admit to being sick? Who spread it? All these wonderful characters belong to Dick Wolf. Couples included: Manstead, Linstead, Dawsey, And Staldez.