Chicago P.D. officially premiered on NBC, launching the series and introducing viewers to the characters and setting of the Chicago Police Department's Intelligence Unit.
The first season concluded, setting the foundation for future storylines and character development in the series.
Brian Geraghty joined the cast, but the character Hank Voight, played by Jason Beghe, remained central to the storyline, solidifying his role as the complex lead character.
Initiated several crossover episodes with Chicago Fire and Chicago Med, creating a shared universe and expanding storytelling possibilities.