The episode sets the stage for recurring themes throughout the series:

A dedicated detective whose professional and personal lives collide when his family is targeted by the cartel.

As the unit closes in on Pulpo, the cartel retaliates by kidnapping Detective Antonio Dawson's young son, Diego. Key Character Introductions

" Stepping Stone ," the series premiere of Chicago P.D. , introduces the high-stakes, morally complex world of District 21's Intelligence Unit. Directed by Michael Slovis, the episode establishes the show's gritty tone and the controversial leadership of Sergeant Hank Voight.

Introduced as a "dirty cop" recently released from prison, Voight is a loose cannon who operates by his own rules to protect his city.

Watch the moments that defined Voight's first case in the Intelligence Unit: Voight's First Case | Chicago P.D. One Chicago YouTube• Feb 5, 2026

Recruited directly from the police academy by veteran Detective Alvin Olinsky, Ruzek is the unit's "new guy," bringing a fresh perspective to the seasoned team.

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