NBC airs three-drama — ‘Chicago Fire,’ ‘Law & Order: Special Victims Unit’ and ‘Chicago P.D.,’ — crossover story line

This photo provided by NBC shows Sophia Bush as Erin Lindsay, left, and Taylor Kinney as Kelly Severide, in the episode "Nobody Touches Anything"  of season 3 on NBC's "Chicago Fire." A story arc about a child pornography ring will be featured on three NBC shows Tuesday and Wednesday, Nov. 11-12, 2014, including "Chicago Fire," "Chicago P.D." and "Law and Order: SVU."  (AP Photo/NBC, Elizabeth Morris)

This photo provided by NBC shows Sophia Bush as Erin Lindsay, left, and Taylor Kinney as Kelly Severide, in the episode "Nobody Touches Anything" of season 3 on NBC's "Chicago Fire." A story arc about a child pornography ring will be featured on three NBC shows Tuesday and Wednesday, Nov. 11-12, 2014, including "Chicago Fire," "Chicago P.D." and "Law and Order: SVU." (AP Photo/NBC, Elizabeth Morris)

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LOS ANGELES — NBC is airing an unusual hat-trick series crossover.

Episodes of three of the network’s dramas, “Chicago Fire,” “Law & Order: Special Victims Unit” and “Chicago P.D.,” will share a story line about an effort to crack a child pornography ring.

The three-parter begins at 10 p.m. EST Tuesday on “Chicago Fire” and wraps up Wednesday on the two other NBC dramas airing back to back from 9-11 p.m. EST.

Making the ambitious crossover feasible: All the shows are produced by Wolf Films in association with Universal Television.

Producer Dick Wolf said linking the two Chicago-based shows made sense, while drawing in New York-based “Law & Order: SVU” was a “little tricky.”

“But it wasn’t too far-fetched to develop a story about child pornography that crosses state lines,” Wolf said, which he called a sad reflection of reality.