Get ready for an exciting crossover event as the OneChicago universe reunites fan favorites! Tracy Spiridakos and Jesse Lee Soffer, known for their roles in 'Chicago P.D.', will be back to save the day as Hailey Upton and Jay Halstead, respectively. But here's where it gets intriguing: their characters are now on a federal level! Upton, a former Chicago P.D. officer, returns as a Special Agent of the FBI, while Halstead, who left the series after a decade, is back as a Special Agent of the Army. The crossover event, airing on March 4th, promises a thrilling three-part adventure. But what's the catch? Well, it's not just about the reunion; it's about the mystery! Firehouse 51 is called to an airfield when a passenger jet goes silent mid-air, leading to a high-stakes emergency. As they uncover the truth, they'll face a bigger and deadlier mystery with far-reaching consequences. Will they be able to save the day and clear up any misunderstandings between Upton and Halstead? Stay tuned to find out! And if you thought surprises were over, get this: Spiridakos will also be making an appearance in the new USA Network series 'Anna Pigeon'. She'll play the lead role of a former city dweller turned park ranger in rural Washington, who uses her skills to solve crimes in national parks. It's a fresh take on her character, and we can't wait to see her in action. So, mark your calendars for the crossover event and get ready for some exciting twists and turns in the OneChicago universe!