NBC's Chicago Franchise Planning First Triple Crossover Event in 5 Years

The One Chicago worlds are about to merge!

A crossover event is coming for Chicago P.D., Chicago Med and Chicago Fire, PEOPLE can confirm. The event marks the first time the trio of shows are having a crossover in over five years.

TVLine was the first to report the news of the episode, which is slated to air later on in the currently-airing seasons of the three shows. It will reportedly see a massive explosion in an office building that draws in the police department, the fire department and the hospital in Chicago.

The last time all three shows crossed over was in 2019, and saw the units come together when a deadly bacteria was spreading in Chicago. There have also been crossover episodes in 2016 and 2018.

Between the pandemic and last year's SAG-AFTRA strike, there's been a five-year gap since the last major crossover moment brought all three worlds together.

News of the upcoming crossover episodes comes after the One Chicago franchise saw a lot of shakeups ahead of its season premieres in September.

Chicago Med saw some changes as Dominic Rains, who played Dr. Crockett Marcel, exited the seriesafter five seasons, PEOPLE confirmed in June. Longtime co-showrunners Diane Frolov and Andy Schneider also departed after leading the show for nine years, and Allen MacDonald took over as showrunner for season 10.

Following Rains' exit, NBC announced that Darren Barnet and Sarah Ramos would join season 10 of Chicago Med as series regulars.

Chicago Fire has also seen some changes, as Eamonn Walker scaled back his series regular role after 12 seasons and Dermot Mulroney stepped in as the new chief for season 13. Last season, after just six episodes, newcomer Rome Flynn departed Fire, shocking fans.

This time last year, Chicago P.D. saw a big change as Tracy Spiridakos was confirmed to be departing the show after seven years following the end of season 11.

She bid farewell to her character, Detective Hailey Upton, in the May finale, and told PEOPLE she was "definitely feeling all the feelings" about her last episode airing.

"It was a very, very difficult decision," she said. "I love this cast and this crew so much. I could get emotional talking about it, but I've been with the show for about seven and a half years-ish, and I honestly just kind of wanted to see what else is out there for me and switch it up a little bit. That was really the only thing. I just felt like it was time to see what else was there."

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Chicago Med, Chicago Fire and Chicago P.D. air Wednesdays on NBC starting at 8 p.m. ET.