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They'll Have to Go Through Me is the seventh episode of the second season and the 22nd overall episode of Chicago P.D.
Summary
The intelligence unit is joined by SVU detectives Benson, Rollins and Amaro to solve the case of a pedophile ring. This episode concludes a crossover with Chicago Fire and Law & Order: Special Victims Unit that begins on "Nobody Touches Anything" and continues on "Chicago Crossover". It is included on the Chicago Fire Season 3 and Law & Order: Special Victims Unit Season 16 DVD sets.