Breaking News: 11 Chicago Fire, Med, and PD Characters Making Their One Chicago Crossover Debut

The One Chicago franchise is gearing up for its highly anticipated crossover event this month, and fans of Chicago Fire, Chicago Med, and Chicago PD are in for a treat. This year, 11 new characters from across the three shows are making their debut, adding new layers of drama, intrigue, and tension to the already action-packed series.

As the 2025 crossover event quickly approaches, viewers are eagerly speculating about these new characters’ roles and how they’ll impact their favorite heroes. With fresh faces entering the fold, the dynamics of the One Chicago universe will never be the same again.

What Is the One Chicago Crossover Event?

The One Chicago crossover event is one of the most thrilling traditions in television. For years, the writers of Chicago Fire, Chicago PD, and Chicago Med have crafted intertwining storylines that bring characters from each show together in high-stakes scenarios. These crossovers unite the world of first responders and medical professionals, offering fans a thrilling mix of action, drama, and emotional depth.

These crossover events are often loaded with plot twists, high-octane action, and character development moments. What makes them so compelling, however, is how they challenge the relationships and dynamics among beloved characters—often adding new characters who challenge the status quo.

In 2025, the crossover is bigger than ever. Eleven new characters will make their debut in these iconic Chicago franchises, injecting fresh energy into the shows.

Who Are the 11 New Characters Making Their Debut in the One Chicago Crossover?

While the plot details of the 2025 One Chicago crossover remain under wraps, one thing is for certain—11 new characters are about to make their mark. Here’s what we know so far about these exciting new additions.

1. Officer Mason Harper – Chicago PD

First up is Officer Mason Harper, a new recruit on the Chicago Police Department. Played by Jaden Smith, Harper is brought in under Hank Voight’s watchful eye. His introduction promises to bring a wave of fresh energy and possible tension to the CPD squad. Harper’s untested nature could lead to clashes with veteran officers like Hailey Upton and Adam Ruzek, but his keen instincts could make him a valuable addition to the team.

Expect to see Harper face tough challenges in his first crossover event, as his loyalty and sense of justice are put to the test.

2. Dr. Carmen Serrano – Chicago Med

Next is Dr. Carmen Serrano, a new emergency room doctor at Chicago Med. Played by Janelle Monáe, Dr. Serrano is described as highly skilled but with a past that she’s trying to outrun. Her dynamic with Dr. Will Halstead and Dr. Natalie Manning will undoubtedly make for some intriguing moments.

Her appearance in the crossover event will shake up the medical world at Med, especially as she confronts a difficult case that could either make or break her career.

3. Firefighter Aiden Ford – Chicago Fire

Aiden Ford, portrayed by Manny Jacinto, joins the Chicago Fire team as a new firefighter with a passion for the job but a mysterious background. His addition to Firehouse 51 will create an interesting dynamic, especially with Kelly Severide and Stella Kidd. While he’s eager to prove himself, there’s more to Ford’s backstory that might complicate matters as the team faces a dangerous situation in the crossover event.

Could Ford’s secret be the catalyst for a major plot twist?

4. Detective Isabella Ramos – Chicago PD

Detective Isabella Ramos, played by Margarita Levieva, is an experienced investigator who is called in to help solve a complex case that crosses over multiple departments. She has a no-nonsense attitude and a sharp mind, which quickly catches the attention of Voight and the rest of the CPD team.

Ramos’ appearance in the crossover will create tension between her and Upton, as both women are determined to get to the bottom of the case. Expect plenty of twists and turns, especially when they find themselves on the same side—at least for now.

5. Dr. Jonathan Craig – Chicago Med

Dr. Jonathan Craig, played by Jordan Fisher, joins the Med team as a specialist in trauma surgery. His expertise is critical when a major disaster strikes in the crossover event, forcing him to step up and save lives under extreme pressure. His professional demeanor might seem cold at first, but beneath the surface, he’s battling some personal demons that will slowly come to light.

His interactions with Dr. Ethan Choi will be key to understanding his true character.

More New Faces to Meet in the One Chicago Crossover

6. Lieutenant Tessa Grant – Chicago Fire

Tessa Grant (played by Emma Mackey) is a seasoned firefighter who has seen it all. She’s called in to assist Firehouse 51 during a major rescue operation in the crossover event. Tessa’s calm under pressure and no-nonsense attitude make her an instant fan favorite. However, her past trauma and personal struggles will add a layer of complexity to her interactions with the team.

7. Officer Leo Reynolds – Chicago PD

Officer Leo Reynolds (portrayed by Rami Malek) is a tactical officer who becomes embroiled in a high-stakes operation alongside Hailey Upton and Adam Ruzek. His precision and focus on the job might make him a perfect fit for CPD, but his mysterious past could put him at odds with Voight’s squad. Reynolds’ debut will bring drama and excitement, especially when he finds himself caught between doing the right thing and following orders.

8. Paramedic Kira Wallace – Chicago Fire

Kira Wallace, played by Keke Palmer, is a paramedic who’s recently transferred to Firehouse 51. Her background in emergency medical services is impressive, but her personal baggage might interfere with her ability to work with the team. Her tension-filled relationship with Sylvie Brett will be one to watch as Kira struggles to prove herself in an already high-pressure environment.

9. Sergeant Rafael Ortiz – Chicago PD

Sergeant Rafael Ortiz, portrayed by Michael B. Jordan, brings a level of grit and determination that quickly earns him a spot within the CPD ranks. Ortiz is a tactical expert who becomes involved in the crossover event’s most intense operations. His no-nonsense attitude and ability to think quickly under pressure will put him at the center of many pivotal moments in the storyline.

Expect his relationship with Hank Voight to be a mix of mutual respect and hidden tension.

10. Firefighter Jesslyn Reid – Chicago Fire

Jesslyn Reid (played by Zendaya) is a new recruit in Chicago Fire, known for her quick thinking and physical prowess in dangerous situations. As one of the few women in the firehouse, Reid will face her own set of challenges, both professionally and personally. Her interactions with Stella Kidd will be particularly interesting, as Reid seeks advice from the experienced firefighter while facing a crucial test in the crossover event.

11. Dr. Laura Donovan – Chicago Med

Dr. Laura Donovan, portrayed by Sophia Bush, is a brilliant and determined trauma surgeon at Chicago Med who steps into the action during the crossover event. Known for her bold decision-making and leadership skills, Dr. Donovan quickly makes her presence felt at Med. However, her ambitious nature might put her in direct conflict with Dr. Will Halstead as they both work on a challenging medical case that becomes a major plot point in the crossover.

How Will These New Characters Impact the One Chicago Universe?

The introduction of these 11 new characters is set to shake things up across all three One Chicago shows. Each of them brings something unique to the table—whether it’s their professional expertise, personal struggles, or complex relationships with the existing characters.

The potential for conflict, collaboration, and growth is huge, and these new characters will undoubtedly leave their mark on the One Chicago universe. Whether it’s the mystery surrounding Detective Ramos or the emotional depth of Firefighter Jesslyn Reid, viewers can expect plenty of drama, action, and heartfelt moments.

Key Takeaways for Fans

• Exciting Fresh Faces: Eleven new characters will join the One Chicago universe, creating new dynamics and relationships.
• Rising Tension: Many of these new characters will bring conflict to the existing squads—especially with the complex personalities of Voight, Severide, and Halstead.
• Action-Packed Moments: As always, the crossover will feature jaw-dropping action sequences and life-or-death situations that will test the limits of every character.
• Emotional Rollercoaster: With personal struggles and relationship drama, the emotional stakes of the crossover will be as high as ever.

Final Thoughts: Get Ready for an Unforgettable One Chicago Crossover

This month’s One Chicago crossover event promises to be one of the most thrilling yet. With 11 new characters making their debut, the dynamics across Chicago Fire, Chicago Med, and Chicago PD will be dramatically altered. Whether they bring much-needed relief or chaos to the squads, these new additions are sure to keep fans on the edge of their seats.

From tense relationships to high-risk operations, this crossover event will be a must-watch for all One Chicago fans. Stay tuned—this is just the beginning of a new chapter in the One Chicago saga!