Here’s a summary and key details for (“Stepping Stone”), written as a recap or introductory text: "Chicago P.D." – Season 1, Episode 1: "Stepping Stone" Original Air Date: January 8, 2014

The series premiere throws viewers straight into the gritty world of the Chicago Police Department’s Intelligence Unit, led by the relentless and morally complex Sergeant Hank Voight. After being vilified as a corrupt cop on Chicago Fire , Voight is repositioned as a brutal but effective leader who plays outside the rules to catch the city’s worst criminals.

The episode follows the hunt for a drug cartel leader responsible for multiple murders. When a key witness is killed and a young boy goes missing, the unit races against time. Detective Antonio Dawson (Jon Seda) struggles with his conscience as he works under Voight, a man he once tried to bring down. Meanwhile, rookie detective Erin Lindsay (Sophia Bush) – Voight’s protégée with a troubled past – proves her sharp instincts but clashes with Voight’s methods.