The One Chicago franchise launched in 2012 with Chicago Fire. Starring
Taylor Kinney, Kara Killmer, and Miranda Rae Mayo, it follows the lives of the firefighters and paramedics of Firehouse 51. Chicago PD launched the following year and followed the crew of the Intelligence Unit and starred Jason Beghe, Jesse Lee Soffer and Marina Squerciati. In 2015 Chicago Med began airing, focusing on the doctors and nurses of the fictional Gaffney Medical Center in Chicago. The three shows often crossover with each other, and characters appear on each other's shows