NBC’s popular One Chicago franchise is bringing back two fan-favorite former stars for its upcoming crossover event scheduled to air on March 4, 2026. The three-hour special will unite characters from Chicago Fire, Chicago Med, and Chicago P.D. in an action-packed storyline that begins with an emergency involving a passenger jet going silent mid-flight and unfolding into a deeper, citywide mystery.
What makes this crossover especially notable is the return of Jesse Lee Soffer and Tracy Spiridakos, who will reprise their beloved roles as Detective Jay Halstead and Hailey Upton, respectively. These appearances mark their first on-screen returns to the One Chicago universe since Soffer’s departure in Chicago P.D. Season 10 and Spiridakos’ exit at the end of Season 11.
In the storyline, Upton returns not as a Chicago Police officer but as an FBI special agent, drawn back to Chicago when a drug enforcement task force case leads her to collaborate with her former colleagues. Meanwhile, Halstead has been operating deep undercover, and his latest assignment unexpectedly brings him into the same investigation Upton is working on. These intersecting paths set the stage for both characters to reunite — much to the delight of longtime fans who have followed their journey together.
Both actors shared that returning to their old roles felt meaningful and nostalgic. According to Soffer, stepping back into Halstead’s shoes “felt natural,” while Spiridakos described her return as feeling “like coming home” and expressed excitement about working again with the cast and crew.
The event will begin with Chicago Fire, transition into Chicago Med, and conclude with Chicago P.D. — all airing in one night. It promises high stakes, emotional reunions, and plenty of excitement for viewers tuning in.