One Chicago returned from its lengthy hiatus to deliver one of its boldest crossover episodes yet, roping in the squads from Chicago Fire, Chicago Medand Chicago P.D. to deal with a chemical weapon onboard a passenger aircraft that lost communication with ATC towers.
The episode offered up plenty of high-stakes moments, putting plenty of lives at risk, and pushing the Windy City heroes to their limits as they tried to race against the clock to find a cure without knowing the chemical agent responsible for the deaths of 185 passengers aboard the flight.
What Is the 2026 One Chicago Crossover About?
"Firehouse 51 is called to an airfield when a passenger jet suddenly goes silent mid-air, triggering a high-stakes emergency. Their discovery cracks open a bigger and deadlier mystery — one with consequences that could ripple far beyond the runway and put countless lives in jeopardy," the logline notes.
It was an all-hands-on-deck situation, and an ambitious task for production of the One Chicago franchises, as the Dick Wolf shows needed to utilize hundreds of extras, background actors and guest stars, with two familiar faces—Hailey Upton (Tracy Spiridakos) and Jay Halstead (Jesse Lee Soffer)—even returning to assist.
One of the guest stars who caused plenty of tension and friction between the FBI and the local Chicago responders was Supervisory Agent Nathan Conway.
Conway arrived on the scene after several of Firehouse 51 responders went onboard and discovered it was a hazmat situation, pushed back on Upton's assesment of the situation that it wasn't terrorism, put his own agents in danger by ignoring Hank Voight (Jason Beghe's) warning that they shouldn't breach a suspects apartment without clearing it first, which led to an explosion, and nearly prevented them from finding the necessary information to create an anecdote in time to save the lives of other exposed firefighters, which would have also prevented them from locating the suspect responsible for the mass casualty situation.
CHICAGO FIRE -- "Reckoning, Part 1" Episode 1415 -- Pictured: Cast -- (Photo by: Peter Gordon/NBC)Despite Conway complicating rescue efforts, Voight and Dom Pascal (Dermot Mulroney) found ways to get things done, even if it meant ignoring direct orders and getting arrested.
So, why did Nathan Conway look so familiar?
Who Played FBI Agent Nathan Conway on the One Chicago Crossover?
Nathan Conway was played by critically acclaimed television and film actor John Marshall Jones.
For those growing up in the '90s, he's best known for his role as Floyd Henderson in Smart Guy, which ran for nearly three seasons on The WB from 1997 to 1999, opposite his on-screen son, played by Tahj Mowry.
He's made appearances in many recognizable shows throughout the years, like Shameless, The Mentalist, Last Man Standing, Pretty Little Liars, Criminal Minds, The Rookie, 9-1-1, Big Little Lies, Bones and much more.
He played Mr. Maynard on Hart of Dixie for 20 episodes, Detective Bruckner on The Fosters, Special Agent Jay Griffin on Bosch, Nelson Bradford on For All Mankind, and Leonard Shaw on All American: Homecoming.
In 2026, in addition to his role in the One Chicago crossover, he'll also be appearing in Malcolm in the Middle: Life's Still Unfair as Brian.
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