Fans of the interconnected world of Chicago Fire, Chicago Med, and Chicago P.D. rejoiced during Chicago Fire Season 13, which triumphantly brought back a beloved tradition: the full-scale One Chicago crossover event! After a five-year absence, the highly anticipated multi-show special reminded viewers why these collaborative episodes are a cornerstone of the franchise’s success.
The epic three-part event, titled “In The Trenches: Part I,” kicked off with Chicago Fire Season 13, Episode 11, before seamlessly flowing into Chicago Med Season 10, Episode 11, and concluding with Chicago P.D. Season 12, Episode 11. This marked the first such crossover since the “Infection” event back in 2019, reigniting a fan-favorite element of the One Chicago universe.

The thrilling storyline centered on a devastating gas explosion beneath a city high-rise, which subsequently threatened the subway system. This high-stakes emergency demanded the combined expertise and bravery of fire rescue teams, trauma doctors, and police tactical units, showcasing the unique strengths of each show working in concert.
This return to unified storytelling wasn’t just about spectacular action; it was a powerful callback to the immersive and nail-biting stakes that defined the early seasons of One Chicago. The crossover allowed for:
- Deepened Cross-Franchise Dynamics: Characters from different shows, like Stella Kidd (Fire) and Adam Ruzek (P.D.), found themselves in peril and formed unexpected bonds, enriching the overall narrative tapestry.
- Exploration of Complex Relationships: The inherent tension between figures like Hank Voight (P.D.) and Kelly Severide (Fire) was revisited, along with Voight’s intricate history with Firehouse 51.
- Hints of New Romances: Subtle interactions, such as those between Violet Mikami (Fire) and Dr. Frost (Med), teased potential future romantic pairings that could span across the different series.
The overwhelming positive reception to this crossover event has effectively solidified its place as a crucial element of the One Chicago franchise’s future. It proves that the collaborative spirit and interwoven narratives remain a potent force, promising more exciting and unified storytelling for seasons to come.