Brett is reeling from the news that Casey will be relocating and they'll be apart from one another for at least three years.

Casey and Severide work with on what could be their last call together on Chicago Season 10 Episode 5.

It's a car pile-up that leads to a harrowing accident that the squad responds to on Chicago Fire Season 10 Episode 5.

Severide and the gang have to pull out the jaws of life to rescue someone during a car accident on the 200th episode.

It's all laughs with all of the gang when Chicago Fire celebrates its 200th episode with Chicago Fire Season 10 Episode 5.

It's an emotional celebration when Chicago Fire celebrates its 200th episode with Chicago Fire Season 10 Episode 5.

It's an emotional celebration when Chicago Fire celebrates its 200th episode with Chicago Fire Season 10 Episode 5.

Will it be Lieutenant Casey's last call with his unit and close friends? The 200th episode will address this.

Will it be Lieutenant Casey's last call with his unit and close friends? The 200th episode will address this.

Will Matt Casey sign off and leave Chicago Fire for good? The 200th episode of the series will address this.

It's the 200th episode of Chicago Fire and Matt Casey makes a huge, life-altering decision that can affect his relationship with Brett.

Casey makes a life-altering decision on Chicago Fire. "Two Hundred" is the fifth episode of the show's tenth season.