The first episode of Chicago Fire aired on NBC, introducing viewers to the lives of firefighters and paramedics at Firehouse 51 in Chicago.
NBC announced a spin-off series called Chicago P.D., expanding the Chicago franchise to focus on the city's police department.
NBC introduced Chicago Med, further expanding the interconnected universe of Chicago-based shows.
The series reached the milestone of airing its 200th episode, showcasing its enduring presence on television.