The first season of this police procedural drama follows the men and women of the Chicago Police Department, led by Sgt. Hank Voight (Jason Beghe), who was first introduced in Season 1 of sister series "Chicago Fire." Serving with him are: Det. Antonio Dawson (Jon Seda); patrol officer Kevin Atwater (LaRoyce Hawkins); Det. Erin Lindsay (Sophia Bush); Det. Sheldon Jin (Archie Kao); Det. Alvin Olinksy (Elias Koteas); Det. Jay Halstead (Jesse Lee Soffer); and patrol officer Kim Burgess (Marina Squerciati). As the team go after a Colombian drug cartel that's linked to a series of brutal slayings, rookie officer Adam Ruzek (Patrick John Flueger) joins the team fresh from the police academy. The season includes a crossover episode with "Chicago Fire."

In the drama series' second season, the men and women of Firehouse 51 face an uncertain future after learning that their station may be slated for a shutdown. Meanwhile, Lt. Severide (Taylor Kinney) is targeted by a serial arsonist; Lt. Casey (Jesse Spencer) becomes a temporary guardian to Andy's two young children after their mother is in a drunken-driving accident and arrested for manslaughter; and Mouch (Christian Stolte) runs for union president. In non-firehouse-related events, a shady individual threatens Molly's bar, and Herrmann (David Eisenberg), Dawson (Monica Raymund) and Otis (Yuri Sardarov) fight to keep it in business. The season includes a crossover episode with "Chicago PD."

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