Instagram/Nick Gehlfuss & Monica Ra Celebrity Which One Chicago stars are open to returning? Get the latest on potential comebacks from Chicago Fire, P.D., and Med favorites. April 21, 2026 AceShowbiz - The One Chicago franchise, created by Dick Wolf, has been a staple of television since 2012, beginning with Chicago Fire. The franchise expanded with Chicago P.D. in 2014 and Chicago Med in 2015, providing viewers with an immersive look into the interconnected lives of firefighters, police officers, and medical professionals in the Windy City.