Rudy Galvan

Two members of the firehouse go missing after a routine call; Casey and Dawson struggle to balance their personal and professional lives; Boden and Donna learn their baby has potential complications.

A string of bombings is targeting members of the media; the team enlists firehouse 51 to help examine the devices and prevent the next attack.

Halstead’s past resurfaces when a former Army colleague is implicated in a deadly blast. As the FBI launches an investigation into Roy’s disappearance, Upton feels the pressure of the secret she and Voight are sharing.