Erik Hellman

Just as Voight's crew get their hands on drugs' kingpin, his cartel hit back by kidnapping Dawson's young son.

Sergeant Hank Voight and his team of officers find themselves in a race against time as they try to locate the kidnapper who has taken the son of one of their own, detective Antonio Dawson.

A devastating fire lands the crew with a lawsuit, while Dawson takes action when a colleague makes inappropriate advances towards her.

Firehouse 51 joins forces with the Chicago Police Department to combat a massive explosion that leaves the city in carnage and one of the crew missing.

This episode concludes a story that began on 'Chicago Fire' in which a huge charity run is targeted by bombers.

Ruzek's future with the unit is in question after a botched undercover job, a corpse is discovered in an SUV, and Lindsay and Halstead move forward with their relationship.