to solve a decades-old child pornography ring case, which is personal for CPD's Detective Erin Lindsay (Sophia Bush).

The episode was written by Ed Zuckerman, Warren Leight, and Dick Wolf, and directed by Steve Shill.

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.

Olivia Benson and Hank Voight, respectively; Lou Taylor Pucci was also praised for his portrayal of Teddy Courtney.

The episode starts 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 that was dropped during Lieutenant Kelly Severide's (Taylor Kinney) attempt to save the man's life.

Lindsay explains to the SVU about how her half-brother Teddy Courtney (Lou Taylor Pucci) went missing when they were younger and how her mother thought that somehow he ran away to New York.

Benson tells Lindsay that the National Center for Missing and Exploited Children (NCMEC) ran Teddy’s face through their system and they found more images, and concluded that he was connected to a pedophile ring.

While searching for Teddy, they learn from the NCMEC that another young boy, Henry Thorne (Christian Goodwin), is being victimized on a live stream—although at the time, no one could track down where the feed was originating from.

Security guard George Turner (Danny Mastrogiorgio) doesn't remember Teddy, but Miss Bagley (Donnetta Lavinia Grays) recommends that the detectives talk to Jocelyn Cerpaski (Isabel Shill), who left the center to start a better life.

Jocelyn initially doesn't want to talk to the detectives, but she directs them to the piers where Teddy solicits.

Turner tells them some details involving toll fees that their prime suspect had to pay in order to get back into the city.

Voight and Benson go to Teddy, who still refuses to remember that part of his life, so they go back to Jocelyn, undercover as Henry's parents in order to get her to talk.

At the squad room, Rollins comes up with a laptop, showing video of another child who had been abducted by the ring, this time a young girl.

Voight was told by Linsday that in Chicago, Andrew Llewellyn (the fire victim who had the child porn photos), and the officer guarding him were shot and killed.

In this episode, Raúl Esparza (Assistant District Attorney Rafael Barba) and newcomer Peter Scanavino (Detective Sonny Carisi) were absent.

[1] On September 29, creator Dick Wolf said of the crossover, "Warren Leight and Matt Olmstead are two of the best writers in the business.

"[3][4] Olmstead said of crafting the crossover, "What Warren and I did was jump in, I knew what I was going to hand off to him at the end of [Chicago] Fire and he told me what he was going to hand back over to me at PD and then we fine-tuned and figured out the logistics.” Leight explained that each show's writers wrote for their own show and said that he and Olmstead were on the phone a lot for the plotting stages.

Those kind of fireworks take place in both episodes and they are among the most fun scenes in SVU and CPD.” Olmstead added with Leight, “When the Benson character shows up the first time during a pretty grim investigation there’s a smile on [Voight’s] face, he’s happy to see her.

"[3] There is a slow-burning relationship between Detectives Lindsay and Halstead, Olmstead teased, "[There will be] further slow burning, because, as has been made clear to them by Voight, he doesn't tolerate in house romances."

And showrunner Leight teased about sexual tension in TV Guide on November 11, "Lindsay and Halstead have this unrequited crush on each other, and you have Rollins and Amaro with a down-low affair going on.

[9] SVU cast members Hargitay, Pino, and Giddish shot the CPD conclusion episode starting October 22 in Chicago.

[2] On November 10, 2014, TV Guide noted that Lou Taylor Pucci would be portraying Lindsay's estranged half-brother, Teddy Courtney.

Pucci guest starred in a Warren Leight written episode of Law & Order: Criminal Intent, "Cruise to Nowhere" as Joey Frost.

"The most unexpected and rewarding development in filming the crossover episodes was seeing how close the actors from the different shows became," says CPD's Olmstead, "Between set-ups they stuck together as a group and they socialized after wrap.

Prior to that, Mastrogiorgio has worked with SVU show runner Warren Leight, guest starring on Law & Order: CI as a murderous drug lord named Testarossa in the episode "Purgatory".

In its original American broadcast on November 12, 2014, "Chicago Crossover" was viewed by 10.01 million viewers and acquired a 2.4 rating/7% share in the age 18–49 demographic.

"Chicago Crossover" was the second ranked program in that timeslot, under ABC's Modern Family, but above Criminal Minds on CBS by 0.1 in the 18-49 age demo.

Narsimha Chintaluri of TV Fanatic said in a positive review, "It was a bold, and probably complicated, move to tie these three shows together, but the premise definitely delivered a strong episode of SVU."

"[12] Matt Carter of cartermatt.com gave the episode a "B+" rating, commenting "This story was about chasing a criminal ring doing unspeakable things to New York City, and there were a number of memorable moments that we saw throughout this.

[14] Easton continued, "While the intermingling of established SVU and CPD characters was great to watch, it would be a huge oversight not to give a commendation of some sort to actor Lou Taylor Pucci whose performance as Lindsay’s extremely damaged brother, Teddy, really tied the two shows together.