<P> "Chicago Crossover" is the seventh episode of the sixteenth season of the American police procedural - legal drama, Law & Order: Special Victims Unit, and the 350th overall episode of the long - running series . It originally aired on National Broadcasting Company (NBC) in the United States on November 12, 2014 . In this episode, the SVU team meets up with the Intelligence Unit of Chicago P.D. to solve a decades - old child pornography ring case, which is personal for CPD's Detective Erin Lindsay (Sophia Bush). </P> <P> The episode was written by Ed Zuckerman, Warren Leight, and Dick Wolf, and directed by Steve Shill . This episode marks an unprecedented crossover in Law & Order franchise history where three shows (all three created by Wolf) crossover with one main storyline . The story began in the 7th episode of season 3 "Nobody Touches Anything" of Chicago Fire where a fire victim was found with child pornography . The Fire Department turn the case over to the Chicago Police, who take on the initial investigation that leads them to Manhattan, where the detectives from Chicago P.D. team up with the SVU in "Chicago Crossover". The story concludes in the CPD episode "They'll Have To Go Through Me", where the main suspect returns to Chicago after leaving behind clues in New York . Filming on "Chicago Crossover" began on October 9, 2014 in New York City . NBC began using the hashtag "#CrossoverWeek" in their on - air promos for the three shows' episodes . </P> <P> "Chicago Crossover" was seen by 10.01 million viewers making the second most viewed program of the night on NBC and the second ranked program in the time slot . Critical response to the SVU episode of the crossover was generally positive, many critics praising the tension - filled scenes and' fireworks' between lead actors Mariska Hargitay and Jason Beghe, who portrayed Sgts . Olivia Benson and Hank Voight, respectively; Lou Taylor Pucci was also praised for his portrayal of Teddy Courtney . </P> <P> The case opens up where the Chicago Fire episode "Nobody Touches Anything", left off; where the CFD firefighters rescued a man from a burning building and in his possession, he held a box full of child pornography, a box which was dropped during Lieutenant Kelly Severide's (Taylor Kinney) attempt to save the man's life . The CFD then turned this evidence over to the Chicago police . Detective Erin Lindsay has a personal stake in the case: her half - brother is involved somehow and in New York City . Benson gets a call from Voight that his team is on a plane to Manhattan to help the SVU solve the case . </P>

Who plays teddy on law and order svu