Get ready for an adrenaline-pumping, heart-wrenching One Chicago crossover event like no other! After five long years, the heroes of Chicago Fire, Chicago P.D., and Chicago Med are finally coming together again on January 29, and the stakes have never been higher.

A gas explosion rocks a high-rise building, leaving a devastating aftermath. Battalion Chief Dom Pascal (Dermot Mulroney) is the first on the scene, informing his team that they are dealing with 50-60 victims and a growing disaster. But the true danger lies beneath the surface. As the situation spirals out of control, it’s clear that saving the victims won’t be easy—especially when some of Chicago’s finest first responders find themselves in peril.

Lt. Stella Kidd (Miranda Rae Mayo) is seen helping trapped civilians on an L train, desperately trying to keep them safe as the ground beneath them begins to shake. “Stay on the train until the ground settles,” she commands, but things are about to take a dire turn. As Battalion Chief Pascal watches the situation unfold, he realizes that the building’s foundation is dangerously unstable. He radios Kidd, urging her to evacuate immediately before the structure collapses. But as panic sets in, Lt. Kelly Severide (Taylor Kinney) becomes frantic, especially when he realizes that his wife, Stella, is still on that train.

“I don’t care who’s still on that train. People are still on that train, including my wife!” Severide exclaims. His emotions are running high as he tries to hold it together, but with the building about to fall apart, time is running out. Sgt. Hank Voight (Jason Beghe) also feels the weight of the situation, especially as he’s told, “We’ve got two of our own down there,” referring to officers and medics trapped beneath the wreckage.

As the disaster unfolds, there’s one chilling moment when we see Kidd and Adam Ruzek (Patrick Flueger) trapped in the underground tunnel, struggling for air. “We’re running out of air,” Stella tells Ruzek in a moment of terrifying vulnerability. The clock is ticking as they try to hold onto hope, but with the risk of further collapse, their survival isn’t guaranteed.

Meanwhile, Chicago Med faces its own crisis. Sgt. Trudy Platt (Amy Morton) is seen being rushed into the emergency room, and Dr. Mitch Ripley (Luke Mitchell) can only say, “She’s crashing,” as Mouch (Christian Stolte) watches helplessly. The heart-wrenching moment amplifies the severity of the crossover, as the paramedics, police officers, and firefighters must now save not only civilians but also their own family members.

In the promo’s final moments, Lt. Severide is visibly shaken, his face covered in tears as he radios Kidd: “Kidd, do you copy?” Only static responds, and the uncertainty of her fate is left hanging in the air.

The official logline for the episode reads, “When a gas explosion rocks a high-rise, Chicago’s first responders come out in force to rescue hundreds of civilians. It’s the calamity beneath the surface, however, that sends our heroes on a race to save 40 people trapped deep underground, including two of their own.”

For fans of the One Chicago franchise, this three-show collaboration is the culmination of years of anticipation, especially after a long break from these massive crossovers. The last time these three shows teamed up for an event was in 2019, and since then, the world has changed. With the added challenges of the pandemic and the SAG-AFTRA strike, this crossover is more than just a reunion—it’s a chance for the characters to show just how far they’ll go to save one another.

Anastasia Puglisi, executive vice president and co-executive producer of One Chicago, explained, “Putting together what is essentially a three-hour action movie is an incredibly ambitious task requiring complete coordination across our writers, casts, crews, and producers, along with help from the city of Chicago. We’re thrilled to have the best talent in every department to meet this challenge, reinforce the #OneChicago brand, and provide our fans with a unique and compelling viewing experience.”

Mark your calendars for January 29 at 8 p.m. ET/PT on NBC, as the action begins. With peril around every corner, this event will leave you breathless as Chicago’s first responders face their biggest challenge yet.

Will Severide be able to save his wife? Will Kidd and Ruzek make it out alive? And who will survive the devastating gas explosion? One thing’s for sure—this One Chicago crossover is an event you won’t want to miss.

Which character are you most worried about in the upcoming crossover? Will the team survive this catastrophe, or will this be the end for some of our favorites? Let the countdown to January 29 begin!