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Chicago Fire, Chicago P.D. and Chicago Med are reportedly set to film their first crossover episode in five years.

According to a new report published by TVLine on Wednesday, November 13, the One Chicago franchise is planning a one-night crossover event, which is due to air later this season. The storyline will reportedly center around a mᴀssive explosion in an office building that will require the services of the city’s fire, police and medical departments.

There have been several crossover One Chicago episodes in the past, with the last time occurring in 2019 before several factors including Covid as well as WGA and SAG-AFTRA strikes make them logistically tricky to film.

The last crossover involved a biological terrorism event that brought all the Chicago teams together to face off against.

Related: One Chicago’s Miranda Rae Mayo and More Stars Tease New Seasons in 3 Words

Chris Haston/NBC Let the countdown begin, because new seasons of Chicago Med, Chicago Fire and Chicago P.D. begin this month! Miranda Rae Mayo, Patrick Flueger, Jessy Schram and more One Chicago stars exclusively dished to Us Weekly about their respective new seasons using just three words. (Some used more than four words, but we won’t […]

Speaking to Forbes in 2019, Chicago Fire executive producer Derek Haus shared insight into the planning for the crossover episode, тιтled “Infection.”

He revealed the inspiration came about after the One Chicago franchise’s creator, Dick Wolf, injured his foot and it was on the verge of becoming infected.

“At a kickoff dinner for this, Dick said, ‘I want to do a biological weapon story, like a flesh-eating bacteria,’ and I was like, ‘Okkkaaay,’” Haas told the outlet. “Then he said, ‘What if it happens at a Bears game,’ and I was like, ‘What if we have a tailgate and we get characters from the three shows and this random guy is walking by and he falls and you realize, oh man, this guy’s been attacked by something.’”

Meanwhile, stars of the respective One Chicago shows spoke to Us Weekly in September about their latest seasons.

Patrick Flueger, who plays Adam Ruzek in the series, shared his pride about Chicago P.D.’s season 12, which kicked off that same month.

“After last year, I feel like we put a ʙuттon on certain story lines, and we kicked off something else,” Flueger, 40, said. “It just feels like we’re hitting the nail on the head right out the gate [and] that it’s exciting.”

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He added, “You’re watching characters that you know and love continue to adapt and grow. … I’m really proud of the episodes. I think they’re very good.”

Related: One Chicago Showrunners Explain the Franchise’s Recent Cast Shakeups

While 2023 was a year full of cast changes for the One Chicago universe, the showrunners say the modifications were made to benefit the franchise as a whole. “Honestly, longevity is really just part of it,” Chicago Fire showrunner Andrea Newman told TVLine in an interview published on Sunday, January 21. “[In] storytelling and in […]

Hanako Greensmith, who portrays Violet Mikami in Chicago Fire, teased details of the show’s season 13, describing it as “fresh”, “intense” and “shocking.”

“I would say fresh. It’s been a lot of fresh new beginnings,” Greensmith said of the latest season. “This is so cliché, we always say, intense. And I would probably say shocking.”