When Clarke first arrived at 51 we smelled a rat. Being wrong felt very right. Instead he proved a loyal friend and firefighter, gracefully removing himself so he didn't steal Hermann's thunder with his promotion to Lieutenant. "McLeod asked me to report on House 51." -- Clarke

After a blaze at a boarding school, Severide begins to question himself on the season finale of Chicago Fire.

Shay prepares to retake the exam on Chicago Fire. "One More Shot" is the 21st episode of the show's second season.

A major explosion takes place during a charity run on Chicago Fire. "A Dark Day" is the 20th episode of the show's second season.

The staff at the firehouse deals with a new tragedy on Chicago Fire.

Severide reaches out to another firefighter who's battling an addiction on Chicago Fire.

Things have been rough on Casey. This is a shot of the character on Chicago Fire.

The stories may be hot on Chicago Fire. But the weather is often cold.

A heroic act has unexpected consequences for the entire squad on Chicago Fire. "When Things Got Rough" is the 17 episode of the show's second season.

Severide ends up as a suspect on Chicago Fire. "A Rocket Blasting Off" is the 16th episode of the show's second season.

The Chicago Fire team is in action in this photo. It's from the episode "Keep Your Mouth Shut."

The squad battles a blaze in a highrise on Chicago Fire. "Keep Your Mouth Shut" is the 15th episode of the show's second season.