For One Chicago fans, there’s nothing quite like the epic crossover episodes that unite the casts of Chicago Fire, Chicago P.D., Chicago Med, and sometimes Law & Order:

SVU. These crossover events bring dramatic storylines, high-stakes rescues, and intense investigations, creating must-watch television. Since the very first Chicago P.D. backdoor

pilot aired within Chicago Fire in 2014, these crossover episodes have only expanded in scale and intensity. From high-risk bioterrorism threats to dangerous serial killers,

from massive fires to hostage situations, these crossovers consistently deliver edge-of-your-seat excitement. Now, as the next three-hour crossover event is set to premiere on January 29, 2025, it’s the perfect time to look back and catch up on every major crossover episode in order.

Wolf Entertainment executive vice president Anastasia Puglisi has described these crossovers as “essentially a three-hour action movie,” which requires careful coordination across all three shows. With top-tier talent involved, the upcoming crossover promises to be the most intense one yet.

One Chicago Crossover Episodes in Order

To prepare for the latest event, here’s a chronological guide to every Chicago Fire, P.D., and Med crossover episode so far:

The Beginning: Introducing P.D. and Med

• Chicago Fire (S1, E23) – “Let Her Go” (2013)
  This episode serves as a backdoor pilot for Chicago P.D., where Lt. Casey and Sgt. Voight join forces while Firehouse 51 celebrates the opening of Molly’s Bar.
• Chicago Fire (S3, E19) – “I Am the Apocalypse” (2015)
  The backdoor pilot for Chicago Med introduces Gaffney Chicago Medical Center when an armed patient threatens the hospital with a deadly airborne disease.

Early Crossovers: Fire, P.D., and SVU Team Up

• Chicago Fire (S2, E20) & Chicago P.D. (S1, E12) – “A Dark Day” / “8:30 PM” (2014)
  A massive explosion forces Firehouse 51 and the Intelligence Unit to team up to rescue civilians and find the bombers before more explosives go off.
• Law & Order: SVU (S16, E7) & Chicago P.D. (S2, E7) – “Chicago Crossover” / “They’ll Have to Go Through Me” (2014)
  Voight’s team collaborates with New York’s SVU detectives to investigate the origins of a child pornography ring.

The Rise of Full One Chicago Crossovers

• Chicago Fire (S4, E10), Chicago Med (S1, E5), Chicago P.D. (S3, E10) – “The Beating Heart” / “Malignant” / “Now I’m God” (2016)
  A firehouse member is critically injured, leading to a medical emergency and a criminal investigation into a corrupt doctor.
• Chicago Fire (S8, E4), Chicago Med (S5, E4), Chicago P.D. (S7, E4) – “Infection” Parts 1-3 (2019)
  A bioterrorism attack forces the three teams to work with the CDC to contain a deadly outbreak.

Recent Crossovers & What’s Next

• Chicago Fire (S13, E11), Chicago Med (S10, E11), Chicago P.D. (S12, E11) – “In the Trenches” Parts 1-3 (2025)
  The upcoming three-hour crossover follows Chicago’s first responders as they rush to rescue victims trapped underground after a gas explosion.

How to Watch the Next One Chicago Crossover

The next highly anticipated crossover event airs on Wednesday, January 29, 2025, starting at 8/7c on NBC. It kicks off with Chicago Fire, followed by Chicago Med, and concludes with Chicago P.D..

Fans can also take part in special One Chicago events during the crossover:

• Xfinity Rewards Sweepstakes (January 23 – February 22) – A chance to win autographed memorabilia and One Chicago merchandise.
• One Chicago Bingo (January 29 – February 4) – Watch the episodes and play along at NBC.com.
• Instagram Live (January 29 at 7:30 p.m. ET) – Join the cast for behind-the-scenes fun and a Q&A session.