NBC is gearing up for its highly anticipated One Chicago crossover event in 2026 — and fans have reason to celebrate. After months of speculation, it has been revealed that two beloved characters from Chicago P.D. are returning to the franchise in a big way.
The three-part crossover will unite Chicago Fire, Chicago Med, and Chicago P.D. when the shows return from their winter break on March 4, 2026. The event begins with a crisis involving a passenger jet that suddenly goes silent mid-flight, prompting Firehouse 51 to investigate. What starts as a rescue mission quickly turns into a citywide emergency that tests all three units.
⭐ Surprise Returns for Fans
In a teaser trailer following the latest Chicago Med episode, NBC revealed that two fan-favorite characters are making unexpected returns:
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Jay Halstead – played by Jesse Lee Soffer – returns after departing Chicago P.D. early in Season 10.
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Hailey Upton – played by Tracy Spiridakos – is also back after leaving at the end of Season 11.
Both actors have been away from the series for seasons, making this reunion a major moment for fans of the franchise.
According to the teaser, sparks are likely to fly when Halstead and Upton are thrown back into action together during the emergency. In the current storyline, Upton is now working as an FBI Special Agent based in Detroit, while Halstead has been operating deep undercover. Their cases intersect in a way that brings them back to Chicago just as the crossover unfolds.
⭐ What This Means for the Crossover
The return of Halstead and Upton adds extra excitement to an already big event. Their relationship history — both professional and personal — has been a fan favorite, and seeing them back together in the One Chicago universe has stirred plenty of buzz online.
While it’s still unclear whether they’ll appear in all three shows or only certain episodes of the crossover, their comeback is set to be one of the biggest highlights of the 2026 event.
The One Chicago crossover event airs on Wednesday, March 4, 2026 on NBC.