1 — Chicago P.d. - Season

The series premiere where the unit hunts a Colombian drug cartel. Adam Ruzek joins the team.

as Detective Jay Halstead: An ex-Army Ranger and Lindsay's partner.

as Detective Alvin Olinsky: A seasoned undercover veteran and Voight’s right-hand man. Chicago P.D. - Season 1

as Detective Sheldon Jin: The unit's tech and surveillance expert.

The first season features a mix of seasoned detectives and eager patrol officers: The series premiere where the unit hunts a

A gun-smuggling case involves high-caliber rounds; Halstead faces a ghost from his past.

as Trudy Platt: The sarcastic, no-nonsense desk sergeant (recurring in Season 1, later a main cast member). Episode Guide Summary focusing on a hospital bombing investigation.

The second half of a crossover with Chicago Fire , focusing on a hospital bombing investigation.